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Best Selling Genuine Mercury Distributor Caps

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  • Constantly Updated Inventory of Mercury Replacement Distributor Cap Parts

We stock Distributor Cap parts for most Mercury models, including Cougar, Grand Marquis, Villager.

Motorcraft
1986 Mercury Grand Marquis Distributor Cap 8 Cyl 5.0L Motorcraft

P311-56BED7E    W0133-1699172  New

Qty:
$20.31
Motorcraft Distributor Cap
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
Brand: Motorcraft
Additional Fitment Information:
Vehicle Submodel Block Engine CID CC
1986 - Mercury Grand Marquis LS V 8 Cyl 5.0L 302 -
YEC
1993 Mercury Villager Distributor Cap YEC

P311-4961BFD    W0133-1637085  New

Qty:
$20.75
YEC Distributor Cap
  • Production: 04/1992-
Brand: YEC
Additional Fitment Information:
Vehicle Prod. Date Range
1993 - Mercury Villager Fr:04-00-92
YEC
1997 Mercury Villager Distributor Cap YEC

P311-4961BFD    W0133-1637085  New

Qty:
$20.75
YEC Distributor Cap
Brand: YEC
Additional Fitment Information:
Vehicle
1997 - Mercury Villager
YEC
1998 Mercury Villager Distributor Cap YEC

P311-4961BFD    W0133-1637085  New

Qty:
$20.75
YEC Distributor Cap
  • Production: -08/1998
Brand: YEC
Additional Fitment Information:
Vehicle Prod. Date Range
1998 - Mercury Villager To:08-00-98
Beck Arnley
1998 Mercury Villager Distributor Cap 6 Cyl 3.0L Beck Arnley

P311-2968DB3    174-6968  New

Qty:
$12.75
Beck Arnley Distributor Cap
  • DISTRIBUTOR CAP
  • Beck/Arnley parts meet foreign nameplate OE specifications for form, fit and function. Our product specialists work with a network of global sourcing partners so you can install the right part with confidence.
Brand: Beck Arnley
Additional Fitment Information:
Vehicle Block Engine CID CC
1998 - Mercury Villager V 6 Cyl 3.0L 182 -
Standard Ignition
1970 Mercury Cyclone Distributor Cap 8 Cyl 5.8L Standard Ignition

P311-31E277A    FD-129  New

393-4988 , B7AZ-12106A , 393-4988T2 , B7A-12106A , 34D-1744A , FEK-12106A , C7TA 12106 A , C154 , 19106467 , 1818724 , 393-3230

Qty:
$15.87
Standard Ignition Distributor Cap
  • Distributor Cap
  • Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1970 - Mercury Cyclone V 8 Cyl 5.8L 351 5753
Standard Ignition
1975 Mercury Bobcat Distributor Cap 6 Cyl 2.8L Standard Ignition

P311-4BF917A    FD-148  New

3230457 , F948AK , C182 , 5D5 , 4-318 , D7TZ-12106B , 5D1021 , 51-1637 , 51-1636 , 234 , 2-4323 , D5DE 12106 AA , 234M , J3230457 , 12309928 , D5DZ-12106A , 832223C1 , F305Z , F948 , 5D1021A , F948G , DH369

Qty:
$16.91
Standard Ignition Distributor Cap
  • Distributor Cap
  • Product Attributes:
    • Contents: Distributer Cap
  • Our distributor caps are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. RFI resistors where specified to eliminate radio static and potential ECU-damaging spikes. Capitalizing on decades of research and development, our distributor caps and rotors contain unmatched quality yielding superior performance. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1975 - Mercury Bobcat V 6 Cyl 2.8L 171 -
Standard Ignition
1983 Mercury Grand Marquis Distributor Cap 8 Cyl 5.8L Standard Ignition

P311-44A1D2A    FD-168  New

E5ZE 12106 AA , F5ZZ-12106AA , F3TZ-12106A , E6TZ-12106A , E5ZZ-12106A , E2ZZ-12106A , D7AE 12106 AA , C194 , E2ZE 12106 AA , E5TE 12106 AA , D7AZ-12106A , 12309925 , F3TZ12106A , F5ZZ 12106 AA , 3854217-1

Qty:
$19.57
Standard Ignition Distributor Cap
  • Distributor Cap
  • Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1983 - Mercury Grand Marquis V 8 Cyl 5.8L 351 5753
Standard Ignition
1981 Mercury Marquis Distributor Cap 8 Cyl 5.0L Standard Ignition

P311-44A1D2A    FD-168  New

E5ZE 12106 AA , F5ZZ-12106AA , F3TZ-12106A , E6TZ-12106A , E5ZZ-12106A , E2ZZ-12106A , D7AE 12106 AA , C194 , E2ZE 12106 AA , E5TE 12106 AA , D7AZ-12106A , 12309925 , F3TZ12106A , F5ZZ 12106 AA , 3854217-1

Qty:
$19.57
Standard Ignition Distributor Cap
  • Distributor Cap
  • w/o EEC Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1981 - Mercury Marquis V 8 Cyl 5.0L 302 -
Standard Ignition
1980 Mercury Marquis Distributor Cap 8 Cyl 5.8L Standard Ignition

P311-44A1D2A    FD-168  New

E5ZE 12106 AA , F5ZZ-12106AA , F3TZ-12106A , E6TZ-12106A , E5ZZ-12106A , E2ZZ-12106A , D7AE 12106 AA , C194 , E2ZE 12106 AA , E5TE 12106 AA , D7AZ-12106A , 12309925 , F3TZ12106A , F5ZZ 12106 AA , 3854217-1

Qty:
$19.57
Standard Ignition Distributor Cap
  • Distributor Cap
  • with Canada Emissions Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1980 - Mercury Marquis V 8 Cyl 5.8L 351 5753
Standard Ignition
1992 Mercury Topaz Distributor Cap 6 Cyl 3.0L Standard Ignition

P311-224F515    FD-169  New

F1DZ 12106 A , ZZM2-24-310 , E4TZ-12106A , C238 , E6AE 12100 CA , ZZM1-24-310 , E47E 12106 AB , E5TZ 12106 A , E47E 12106 AA , F37Z-12106A , 12336857 , 8933004024 , E6AZ-12106A , F1DZ-12106A

Qty:
$30.64
Standard Ignition Distributor Cap
  • Distributor Cap
  • Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Screw Included
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1992 - Mercury Topaz V 6 Cyl 3.0L 182 2986
Standard Ignition
1984 Mercury Capri Distributor Cap 6 Cyl 3.8L Standard Ignition

P311-224F515    FD-169  New

F1DZ 12106 A , ZZM2-24-310 , E4TZ-12106A , C238 , E6AE 12100 CA , ZZM1-24-310 , E47E 12106 AB , E5TZ 12106 A , E47E 12106 AA , F37Z-12106A , 12336857 , 8933004024 , E6AZ-12106A , F1DZ-12106A

Qty:
$30.64
Standard Ignition Distributor Cap
  • Distributor Cap
  • with EEC IV Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Screw Included
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1984 - Mercury Capri V 6 Cyl 3.8L 232 -
Standard Ignition
1971 Mercury Capri Distributor Cap 4 Cyl 2.0L Standard Ignition

P311-09C182B    GB-423  New

105480501108/02 , 242797-8 , C546 , 001 582 802 , 243797-8 , 8352346 , 3469033 , 8127929 , 1212137 , 2427978 , 51-1881 , 12111-359-874 , 243797 , 1235522193 , 51-1880 , DC41 , 006080130600/00 , 923 602 923 00 , T1012536 , 6-328 , DC54 , 165550501100/02 , 6-334 , 90348450 , 3D1012 , 21941217 , W309M , 8811960 , FPP-710254 , 1211265 , D369A , 3443709 , 049 905 207 , 000 158 2802 , 113 905 207A , 001 582 702 , 113 905 207C , T1029263 , 1212148 , DC42 , D1FZ-12106A , 19106476 , 8G6 , 9936014 , 03172 , 1211252 , RB912G , 2-4793 , 03142 , 9956014 , D3FZ-12106A , DC43 , 21941220 , 03155 , 12350121 , 46600193 , 113 905 207B , 60801306 , 15503 , E324Z , 12111-354-449 , 21941208 , 8355950 , 008230523700/00 , 94632558 , 616 602 215 02 , 000 158 2702 , 7501216 , 72HF 12106 AA , 21941229 , 1212142 , 21941227 , D1FZ 10106 A , 546279 , 03203 , 12111-363-191 , 5D1012A , 03010 , W309 , J8127929 , 705410000000 , 8355935 , RB912 , 174-4796 , 12111-363-423 , 7701029263 , DC35 , 12111-363-291 , 1211259 , DH157 , 116550501100/02 , 5941.27 , 1235522056 , 5D1012 , 03029

Qty:
$10.05
Standard Ignition Distributor Cap
  • Distributor Cap
  • Genuine Intermotor Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Our distributor caps are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. RFI resistors where specified to eliminate radio static and potential ECU-damaging spikes. Capitalizing on decades of research and development, our distributor caps and rotors contain unmatched quality yielding superior performance. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1971 - Mercury Capri L 4 Cyl 2.0L 122 1993
Standard Ignition
1986 Mercury Marquis Distributor Cap 6 Cyl 3.8L Standard Ignition

P311-224F515    FD-169  New

F1DZ 12106 A , ZZM2-24-310 , E4TZ-12106A , C238 , E6AE 12100 CA , ZZM1-24-310 , E47E 12106 AB , E5TZ 12106 A , E47E 12106 AA , F37Z-12106A , 12336857 , 8933004024 , E6AZ-12106A , F1DZ-12106A

Qty:
$30.64
Standard Ignition Distributor Cap
  • Distributor Cap
  • with EEC Blue Streak Premium Quality
  • Product Attributes:
    • Contents: Screw Included
  • Standard Blue Streak caps and rotors are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle Block Engine CID CC
1986 - Mercury Marquis V 6 Cyl 3.8L 232 -
Standard Ignition
1998 Mercury Villager Distributor Cap Standard Ignition

P311-52B4ADD    JH-176  New

5S9 , 174-6968 , DHE449 , 22162-88G00 , 19017070 , 22162-0B020 , 5D1149 , F361 , W3079 , 2-4980 , 12336260 , 60-319 , F3XA 12106 AA , 03330 , F3XY-12106A , E328A , C718 , 51-1766 , 5E9 , JD942

Qty:
$25.47
Standard Ignition Distributor Cap
  • Distributor Cap
  • Genuine Intermotor Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Our distributor caps are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. RFI resistors where specified to eliminate radio static and potential ECU-damaging spikes. Capitalizing on decades of research and development, our distributor caps and rotors contain unmatched quality yielding superior performance. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle
1998 - Mercury Villager
Standard Ignition
1999 Mercury Villager Distributor Cap Standard Ignition

P311-4906DA0    JH-240  New

W3162 , 03414 , 88921794 , JP1000 , JH932 , DH3224 , 24394 , 2-4050 , XF5Z-12106AA , 221620W00A , F9004 , 4M4 , 174-7034 , 51-1797 , 5D1370 , E390C , JA9026 , 5D1147 , 22162-7B000 , C980 , 51-1801 , 22162-0W000

Qty:
$23.98
Standard Ignition Distributor Cap
  • Distributor Cap
  • Genuine Intermotor Quality
  • Product Attributes:
    • Contents: Distributer Cap
  • Our distributor caps are made of high dielectric strength, glass/mineral reinforced polyester resin for less carbon tracking, greater resistance to electrical breakdown, and superior performance. Solid brass terminals (where available) make better connections and greater resistance to electrical pitting and corrosion. RFI resistors where specified to eliminate radio static and potential ECU-damaging spikes. Capitalizing on decades of research and development, our distributor caps and rotors contain unmatched quality yielding superior performance. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product.
Brand: Standard Ignition
Additional Fitment Information:
Vehicle
1999 - Mercury Villager
Motorcraft
1990 Mercury Cougar Distributor Cap Motorcraft

P311-30C9C3C    W0133-1698760  New

Qty:
$25.75
Motorcraft Distributor Cap
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
Brand: Motorcraft
Additional Fitment Information:
Vehicle Aspiration
1990 - Mercury Cougar Naturally Aspirated
Motorcraft
1997 Mercury Cougar Distributor Cap 6 Cyl 3.8L Motorcraft

P311-30C9C3C    W0133-1698760  New

Qty:
$25.75
Motorcraft Distributor Cap
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • Excludes California
Brand: Motorcraft
Additional Fitment Information:
Vehicle Block Engine CID CC
1997 - Mercury Cougar V 6 Cyl 3.8L 232 -
Motorcraft
1987 Mercury Topaz Distributor Cap Motorcraft

P311-3B3D409    W0133-1698761  New

Qty:
$24.01
Motorcraft Distributor Cap
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
Brand: Motorcraft
Additional Fitment Information:
Vehicle
1987 - Mercury Topaz
Motorcraft
1985 Mercury Topaz Distributor Cap 4 Cyl 2.3L Motorcraft

P311-3B3D409    W0133-1698761  New

Qty:
$24.01
Motorcraft Distributor Cap
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • with EEC IV
Brand: Motorcraft
Additional Fitment Information:
Vehicle Block Engine CID CC
1985 - Mercury Topaz L 4 Cyl 2.3L 140 -

Latest Mercury Repair and Distributor Cap Installation Advice

CarJunky AutoAdvice

1999 Mercury Villager Still chugging

Showing 3 out of 3 Posts
Question From lkgahagan on 1999 Mercury Villager Still chugging

I have a 1999 Mercury Villager, it has 153,000 miles and the engine is . While drving the car down the road, it began to chug like a fule filter was clogged. It would only do this after it warmed up. I took the van into the shop. The distributor cap was replaced, the distrubor was replaced, the fule pump, and the fule filter was replaced. It has not solved the problem. It will not accelerate over 200,000 RPMs. When placed on a computer scaner it shows nothing wrong. Please help!!

Response From Loren Champlain Sr Top Rated Answer

Try cleaning the mass air flow sensor. Common Ford problem. May or may not be the problem, but can't hurt. 200,000 rpms? That's great! Mine won't do a smidge over 150,000.

Response From Guest

I would agree but these have a Nissan Motor in them ....

1996 Mercury Villager PO325 code

Showing 4 out of 4 Posts
Question From lawsontw on 1996 Mercury Villager PO325 code

Help needed for 96 Mercury Villager...when cold van starts fine but runs for 15 - 30 minutes then will start to miss and run rough until it eventually will die. If codes checked at that time before starting I get a PO325 Knock Sensor 1 circuit malfuntion Bank 1 or 1 Sensor. Have replaced plugs, wires, distributor cap,rotor,fuel filter, ignition coil, (power transistor)i.e. ignition control module no help. Everytime after engine cools it starts again and runs about 20 minutes. Could this be catalytic converter or exhaust related? Have tried when it dies to spray starter fluid in throttle body but will not start.

Thanks in advance!!!

Response From DanD

When its not starting what’s missing; spark, fuel pressure or injector pulse?
We would need this information to even begin suggesting anything.
Dan.

Response From lawsontw Top Rated Answer

Hi Dan,
Im trying to check all of that with the limited equipment I have. When it gets to operating tempeture it starts running
rough then dies. When I turn ignition on I get several clicks then they stop? Is it posible the fuel pump could quit
like that when warm same time every time?
Thanks,
Tom

Response From DanD

Sure almost anything is possible but you don’t want to be throwing parts at this thing on guesses.
Dan.

1993 Mercury Cougar car accelerates strangley after it warm

Showing 5 out of 5 Posts
Question From adam035827 on 1993 Mercury Cougar car accelerates strangley after it warm

after about 20 minutes of driving my car the check engine light turns on. the car then begins to shake and accelerate much slower than it usually does, and after about 2 seconds it accelerates quickly again. the car only shakes when my foot is on the gas. it doesnt do this constantly but it does it every time i drive it longer than 20 minutes. the check engine light also turns on for a short time then off and back on again. there does not seem to be a correlation to the light and the symptoms, but they both always happen around the same time. ive replaced the spark plugs, wires, rotor, distributor cap, and the transmission. ive also had my entire fuel system cleaned. any help would be appreciated. this is driving me nuts.

Response From nickwarner Top Rated Answer

The engine light is coming on, therefore there are codes that tell what system is acting up. Get the codes read, post back with them and we can see what we are dealing with. Not much else we can do without that.

Response From adam035827

the car was made before the code thing came out :(

Response From Tom Greenleaf

93's had codes but used OBDI system not the '96 and newer OBDII which is more comprehensive,

T

Response From Tom Greenleaf

Agree with nick - get the code(s) but for now I'd ignore a likely code for O2 sensor in a '93 as running lousy would fool it. I'm thinking more likely (still check) the TPS or connection to it is trouble. Don't just replace it on just that or be throwing parts at random as that's a waste. Some stuff will last forever and some is subject to wear,

T

Car runs rough after changing spark plugs and wires

Showing 2 out of 21 Posts | Show 19 Hidden Posts
Question From 78merc on Car runs rough after changing spark plugs and wires

Hello,
I have posted on this sight before and found people to be very helpful.
I recently had my mechanic adjust the idle speed on my 1978 Mercury Grand
Marquis with the 460 V8. He got it running great!. Never one to leave well
enough alone, I decided to give the car a DIY tuneup. I purchased some Autolite
spark plugs, gapped the spark plugs using one of those cheap disc shaped
gappers, used dielectric grease, and installed them one at a time so I wouldn't
get the plugs mixed up. I screwed them in finger tight, then screwed them in a
little more with the wrench. I thought I did everything correctly. After
driving it a while, I noticed that it seemed to run rough and shake,
particularly upon acceleration. I went to NAPA and purchased new wires,
carefully installed them one at a time, and still the same problem. I haven't
replaced the distributor cap and rotor yet. Any ideas what I did wrong? Any
input would be GREATLY appreciated!

Response From Hammer Time

I'm curious about this statement


I screwed them in finger tight, then screwed them in a
little more with the wrench.

Wrench????
They make sockets specific for spark plug that prevents cracking them which can happen very easily and spotting a crack in a plug isn't so easy but it will definitely cause a misfire.
I'd also double check that you bought the right plugs.

Response From 78merc

Thanks so much for the replies. I put a small amount of dielectric grease in the spark plug boot portion of the spark plug wires. I did not put grease on the distributor side of the spark plug wires. I was using the appropriate size socket for the spark plugs recommended by the parts store. One of the spark plugs made a very light cracking noise when I was installing it. I didn't think of it at the time, but perhaps it is causing the problem. I don't remember which one it was, so maybe I should just replace them all? Also....

Are the disc cheap disc shaped gappers accurate? Should I buy a different gapper?

If I decide to replace the distributor cap and rotor, do I need to put any grease or lubricant in any part of the distributor or rotor?

Thanks!!!!

Response From Tom Greenleaf

Check that you have the right plugs. You just said you heard a "cracking" sound so that would totally explain it. You can't even drop the box they came in sometimes.

OK - Do you know how to cancel one plug at a time and see which one (probably just one) does not make it idle worse? The one that doesn't change anything is the one.

Hey - a 460 even in a monster car was still in need of proper plug removal/install tools such that you get a straight line of force as not to put any pressure of the porcelain to wire part.

Canceling plugs one by one: Safer is to shut off engine, pull one plug wire and with jumper clipped both end wire ground the wire to engine ground. Start engine and see if it's same or worse.

Long time ago now but think a 460 about then the back plug, closest to passenger's side firewall/heater box was the hard one? IMO if so that's the one to check first and don't even bother putting a used one back in the hard one.

Stuff happens: If you drop a plug, or question one going in mark that one is just crayon or something you can remove easily. Do that if the box was damaged on any so you know where that one went if problems begin instantly like that go there first.

If you are using one of those "T" handle plug things with a swivel those just are not good enough. Save that for a lawnmower and get better stuff that can take several things to get that straight line of force. You should also mark each plug coming out as to where it came from noting how each looks compared to the others especially as a DIYer,

T

T

Response From 78merc

Thanks for the replies! I purchased the spark plug socket at the Autozone when I purchased the plugs. It has the rubber in the back of the socket that you mentioned. Its meant for spark plugs. I will try to find the broken spark plug and go from there. Also, its not impossible that I disconnected a vacuum hose somewhere. I'll let you know how it goes. Thanks!!

Response From Tom Greenleaf

OK - Read what I said or ask for a better explanation of cancelling plugs without needing wild equipment.

Note: Plugs and sockets etc: THERE ARE A ZILLION DIFFERENT SIZES FOR 3 fairly common sizes for cars + trucks. Common is 5/8th, then 13/16th and some older stuff was 7/8th. Of each they should hold the plug with rubber as you said. Now some are 6 point, 12 point, have swivels on them, lock to an extension or ratchet have hex tops to use a wrench and a 100 more differences I can't just recite right now.

Some and it was a 460 (in truck, 1978) was dang impossible without very specific socket + no room for a ratchet so need the hex end on the socket. This crap can make anyone go nuts! Neat trick to start some is use a rubber hose to start them in. They make a tool for that too.

They seem so silly but are the only things that spark the fuel! When I said ground out suspect ones especially handy with a tachometer hooked up you'll see which one or maybe more don't change the idle roughness, hence lower RPM. Do look for your vacuum hoses anyway and toss for new any that are the least bit hard, soft or cracked.

Plugs again and canceling them: The jumper alligator clip could be either at distributor or better at the plug - you ground it on purpose both so distributor, wires aren't stressed to find ground and so you don't get a shock. These silly things. $2 bucks for a pair at cheapo places...........


You just don't want sparks going random in distributor unseen or to another wire when one is unhooked to confuse it. YOU SAID YOU HEARD A CRACK so that about nails it that, that plug cracked, perhaps unseen. That or plain defective, mishandled by you or in shipping or who knows?

Sorry to beat the subject up that much. Treat plugs as if they were light bulbs in handling them -

T

Response From 78merc

Believe it or not, the plugs weren't too hard to get in and out. My neighbor had a nifty wrench that I attached the spark plug socket too. Its long and swivels back and forth at the head, so it wasn't too hard. That being said, I figured I would take the unscientific method of replacing all of the spark plugs on the side of the engine I remember hearing a crack, then drive the car and see if it runs better. If it doesn't, I would try the other side with the same new spark plugs. I like your method better because I could pin the broken plug down, save money, and be sure I haven't ruined any other plugs. Sorry I am such a novice, but could you explain it to me one more time? I didn't quite follow your explanation. Not sure where or how you ground the wires. Thanks!

Response From Hammer Time

Sorry I am such a novice, but could you explain it to me one more time? I didn't quite follow your explanation. Not sure where or how you ground the wires.

This could be really entertaining to watch.

Those old coils didn't have as much power as today's but finding 10,000v the hard way can still be hilarious.

Could you have someone video you doing this?

Response From 78merc

Thanks for the advice! I went ahead and replaced all four plugs on the side of the engine that I thought might have the bad plug. Success! The car no longer has the miss and has a lot more power too!

An interesting side note. When I was gapping these plugs I did notice that they were a lot more accurately gapped than the first batch I bought. I might replace the other four just to be safe. I'm getting a lot of practice at replacing spark plugs.
Thanks again!

Response From Hammer Time

Just curious........................ what kind of plugs did you put in here?


Please don't say Bosch platinum or any for of Platinum for that matter

Response From Tom Greenleaf

Agree on that. Plain plugs that are called for. Quick look out there, these should be just fine..........
Autolite Copper/Spark Plug / Part Number: 26 (disclaimer - looks ups as shown might be wrong from where that came from) Playing with tricks with plugs doesn't work any better than what it called for. About one trick works to get one vehicle to a junk yard for it's last ride. If good they SHOULD be real close in gap to the spec listed and if not keep looking, T

Response From 78merc

I purchased the Autolite plugs you mentioned. They are number 26. I am going to go to the same store tomorrow to purchase the other four spark plugs and make sure they are gapped close to spec like the four I just installed were.

One more question and I promise to wrap up this post. My mechanic likes to rev the engine while spraying carb cleaner down the carb throat to clean the carb and "blow out the carbon". A friend told me that this will gas foul the plugs. Will this gas foul the plugs? Is there a way to clean the plugs if they are fouled?

Thanks!

Response From Tom Greenleaf

Seems part look up was right. IDK why they were off gap the first round - dropped box or who knows? It's your biz but you shouldn't be paying for new plugs if all was as I see it - something went wrong but at least they are not expensive.

Cleaning carb like you mechanic like is fine but I prefer to do things like that BEFORE replacing plugs if just maintenance so if debris gets to foul up a plug it would be one you are about to replace.

As you know this is a real pig by that exact year even worse. It also helps to get carbon out by just a good long run and aggressive acceleration letting RPMs max (weak things could give out) out what trans allows at a safe, legal place like an on ramp to highway with little to no traffic. These were good tough engines and TMK '78 was the last year they put them in "passenger" cars, as meeting emissions and MPGs was tough to do with the humongous block engines.

Good luck with it,

T

(edit to add) "Is there a way to clean plugs when fouled?" If just a fleck to knock off one that is self grounded with junk just a pin. If really plain fouled from use or if now an oil burner just toss them for new. Heck, if you are there to check on them all put new ones back. Truly cleaning plugs with a machine was for things much older than this and can rough up surfaces such that they will collect junk faster so not advised.)

Response From Discretesignals

Probably wouldn't hurt to start reading your plugs to see what is going on in the combustion chamber.

Response From Hammer Time

He did read them............... they say Autolite 26

Response From Tom Greenleaf

Beat this thread up some more. I think what was meant is looking at the plugs as a diagnostic of what is happening. Good info if the same one always has a problem type thing.

Can't expand this showing some common flaws vs normal........



Tom

Response From Hammer Time

I think what was meant is looking at the plugs as a diagnostic of what is happening

I bet DS got the joke.

Response From Discretesignals

He did

Response From Tom Greenleaf

Again - just saves time. Put an alligator clip stuffed into and clipped to metal inside unhooked spark plug boot and ground it out of harm's way on something particularly on engine block. All that dang spark wants is to find ground whether making a plug do it or not.

Being new you can get just one new one and use an old one that works as needed till you get one. Makes a mess of stuff but save old parts like projects like this till all clear and working with the new stuff.

I'm writing/suggesting the low tech but effective approach that plain works for testing and finding which one as said, that all. I/we have to be mind readers as to what is available to you to do what while being realistic that wildly expensive approaches for something like this are not practical or cost effective.

What can stink is when you have new defective parts sometimes too common. You do have the right approach to do things ONE at a time so eliminating mixing things up either firing order or now vacuum lines where it's near impossible to get some diagram.

Back on something: When you gap new plugs they should be close right out of the box. If a lot is needed those plugs are wrong or plain suk.

Another redneck trick: Use some cheap clothes pins or something to mark wires and hoses and # them can help with order of some things like this. Using a piece of cardboard with punched holes for items that should go back in exact place and mark things.

T

Response From Hammer Time

You cannot use regular sockets on spark plugs.
As` i said, they make special sockets that have a rubber insert to prevent the plug from breaking. If you heard a noise, then you broke one or more of the plugs. They are only made of glass.

Response From MarineGrunt Top Rated Answer

Where did you put the dioelectric grease? I know you said you only did one plug and then one wire at a time but are you 100% sure you didn't get a couple wires mixed up? Are you sure the plugs are gapped properly? Check other connections and hoses that you might've accidently knocked off during install. Maybe you accidently knocked off a vacuum hose or something.

I'm not sure if on your engine you adjust timing by turning the distributor cap, but if you do, maybe you bumped the distributor cap while plugging in the wires and it through off your timing?

If nothing else maybe try reinstalling the old plugs and see what happens. Maybe the parts store accidently gave you the wrong ones.