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Best Selling Genuine Gmc Exhausts

  • We Stock the following top leading brands, including Magnaflow
  • Constantly Updated Inventory of Gmc Replacement Exhaust Parts

We stock Exhaust parts for most Gmc models, including C1500, C1500 Suburban, C2500, C2500 Suburban, C3500, Canyon, Jimmy, K1500, K1500 Suburban, K2500, K2500 Suburban, K3500, R1500, R2500, R3500, Sierra 1500, Sierra 1500 HD, Sierra 2500, Sierra 2500 HD, Sierra 3500, Sierra 3500 HD, Sonoma, Terrain, V1500, V2500 Suburban, V3500, Yukon, Yukon XL 1500.


Magnaflow
2006 GMC Yukon Exhaust System Kit 8 Cyl 5.3L Magnaflow - MF Series Stainless Cat-Back System

P311-1335B0F    15666  New

Qty:
595.03
Magnaflow Exhaust System Kit
  • ; Single Passenger Side Rear Exit
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Bolt-on
    • Main Piping Diameter: 3
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 4
    • Tip Finish: Polished
    • Tip Length: 12
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Block Engine CID CC
2006 - GMC Yukon V 8 Cyl 5.3L 325 5328
Magnaflow
2013 GMC Sierra 1500 Exhaust System Kit 6 Cyl 4.3L Magnaflow - MF Series Stainless Cat-Back System

P311-55DC06C    15565  New

Qty:
859.68
Magnaflow Exhaust System Kit
  • ; Dual Split Rear Exit
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Dual Split Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 3
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 3.5
    • Tip Finish: Polished
    • Tip Length: 18
    • Tip Material: Stainless Steel
    • Tip Type: Clamp-on;single Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2013 - GMC Sierra 1500 Extended Cab Pickup 78.9 V 6 Cyl 4.3L 262 -
Magnaflow
2007 GMC Sierra 1500 Exhaust System Kit 8 Cyl 5.3L Magnaflow - MF Series Stainless Cat-Back System

P311-4EAABAD    16741  New

Qty:
736.30
Magnaflow Exhaust System Kit
  • ; Dual Split Rear Exit
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Dual Split Rear
    • Inlet Connection Type: Bolt-on
    • Main Piping Diameter: 3
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 3.5
    • Tip Finish: Polished
    • Tip Length: 18
    • Tip Material: Stainless Steel
    • Tip Type: Clamp-on;single Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2007 - GMC Sierra 1500 Crew Cab Pickup 69.3 V 8 Cyl 5.3L 325 5328
Magnaflow
2006 GMC Sierra 1500 Exhaust System Kit 8 Cyl 4.8L Magnaflow - MF Series Stainless Cat-Back System

P311-40D352D    15792  New

Qty:
708.38
Magnaflow Exhaust System Kit
  • ; Dual Split Rear Exit
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Dual Split Rear
    • Inlet Connection Type: Bolt-on
    • Main Piping Diameter: 3
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 3.5
    • Tip Finish: Polished
    • Tip Length: 18
    • Tip Material: Stainless Steel
    • Tip Type: Clamp-on;single Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2006 - GMC Sierra 1500 Extended Cab Pickup 78.0 V 8 Cyl 4.8L 294 -
Magnaflow
1996 GMC K1500 Exhaust System Kit 8 Cyl 5.7L Magnaflow - MF Series Stainless Cat-Back System

P311-2AA6BD2    15750  New

Qty:
694.50
Magnaflow Exhaust System Kit
  • ; Dual Split Rear Exit
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Dual Split Rear
    • Inlet Connection Type: Bolt-on
    • Main Piping Diameter: 2.5
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 3.5
    • Tip Finish: Polished
    • Tip Length: 18
    • Tip Material: Stainless Steel
    • Tip Type: Clamp-on;single Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
1996 - GMC K1500 Extended Cab Pickup 78.0 V 8 Cyl 5.7L 350 -
Magnaflow
2015 GMC Sierra 3500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - Black Series Diesel 4in. Filter-Back

P311-1D3940C    17063  New

Qty:
528.04
Magnaflow Exhaust System Kit
  • Black DPF Series Diesel 4in. Filter-Back
  • ; Single Passenger Side Rear Exit
  • Black Series Diesel 4in. Filter-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Pipe Material: Stainless Steel
    • Series: Black Dpf
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 5
    • Tip Finish: Black Coated
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2015 - GMC Sierra 3500 HD Crew Cab Pickup 78.8 V 8 Cyl 6.6L 403 6599
Magnaflow
2015 GMC Sierra 2500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - Black Series Diesel 5in. Filter-Back

P311-3BFE342    17064  New

Qty:
533.24
Magnaflow Exhaust System Kit
  • Black DPF Series Diesel 5in. Filter-Back
  • ; Single Passenger Side Rear Exit
  • Black Series Diesel 5in. Filter-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 5
    • Pipe Material: Stainless Steel
    • Series: Black Dpf
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 6
    • Tip Finish: Black Coated
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2015 - GMC Sierra 2500 HD Extended Cab Pickup 97.6 V 8 Cyl 6.6L 403 6599
Magnaflow
2017 GMC Sierra 3500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - Black Series Diesel 4in. Filter-Back

P311-24401D2    17065  New

Qty:
628.46
Magnaflow Exhaust System Kit
  • Black DPF Series Diesel 4in. Filter-Back
  • ; Dual Same Side Behind Passenger Rear Tire Exit
  • Black Series Diesel 4in. Filter-Back
  • Product Attributes:
    • Exit Style: Dual Same Side Behind Passenger Rear Tire
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Pipe Material: Stainless Steel
    • Series: Black Dpf
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 5
    • Tip Finish: Black Coated
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2017 - GMC Sierra 3500 HD Crew Cab Pickup 78.8 V 8 Cyl 6.6L 403 6599
Magnaflow
2018 GMC Sierra 3500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - Aluminized Pro Series Diesel 4in. Filter-Back

P311-102BE74    18943  New

Qty:
289.88
Magnaflow Exhaust System Kit
  • Aluminized Pro DPF Series Diesel 4in. Filter-Back
  • ; Single Passenger Side Rear Exit
  • Aluminized Pro Series Diesel 4in. Filter-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Pipe Material: Aluminized Steel
    • Series: Aluminized Pro
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 5
    • Tip Finish: Polished
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2018 - GMC Sierra 3500 HD Crew Cab Pickup 97.6 V 8 Cyl 6.6L 403 6599
Magnaflow
2011 GMC Sierra 3500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - Aluminized Pro Series Diesel 5in. Filter-Back

P311-4C546BD    18944  New

Qty:
327.28
Magnaflow Exhaust System Kit
  • Aluminized Pro DPF Series Diesel 5in. Filter-Back
  • ; Single Passenger Side Rear Exit
  • Aluminized Pro Series Diesel 5in. Filter-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 5
    • Pipe Material: Aluminized Steel
    • Series: Aluminized Pro
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 6
    • Tip Finish: Polished
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2011 - GMC Sierra 3500 HD Crew Cab Pickup 78.8 V 8 Cyl 6.6L 403 6599
Magnaflow
2018 GMC Sierra 3500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - MagnaFlow Pro Series Diesel 4in. Filter-Back

P311-1AB9FF0    17976  New

Qty:
456.91
Magnaflow Exhaust System Kit
  • MagnaFlow Pro DPF Series Diesel 4in. Filter-Back
  • ; Single Passenger Side Rear Exit
  • MagnaFlow Pro Series Diesel 4in. Filter-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Pipe Material: Stainless Steel
    • Series: Magnaflow Pro Dpf
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 5
    • Tip Finish: Polished
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2018 - GMC Sierra 3500 HD Extended Cab Pickup 78.8 V 8 Cyl 6.6L 403 6599
Magnaflow
2014 GMC Sierra 2500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - MagnaFlow Pro Series Diesel 5in. Filter-Back

P311-1E29DBD    17870  New

Qty:
462.26
Magnaflow Exhaust System Kit
  • MagnaFlow Pro DPF Series Diesel 5in. Filter-Back
  • ; Single Passenger Side Rear Exit
  • MagnaFlow Pro Series Diesel 5in. Filter-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 5
    • Pipe Material: Stainless Steel
    • Series: Magnaflow Pro Dpf
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 6
    • Tip Finish: Polished
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2014 - GMC Sierra 2500 HD Crew Cab Pickup 97.6 V 8 Cyl 6.6L 403 6599
Magnaflow
2012 GMC Sierra 2500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - MagnaFlow Pro Series Diesel 4in. Filter-Back

P311-49DB410    17871  New

Qty:
535.08
Magnaflow Exhaust System Kit
  • MagnaFlow Pro DPF Series Diesel 4in. Filter-Back
  • ; Dual Same Side Behind Passenger Rear Tire Exit
  • MagnaFlow Pro Series Diesel 4in. Filter-Back
  • Product Attributes:
    • Exit Style: Dual Same Side Behind Passenger Rear Tire
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Pipe Material: Stainless Steel
    • Series: Magnaflow Pro Dpf
    • Subtitle: Particulate Filter-back
    • Tip Diameter: 5
    • Tip Finish: Polished
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;single Wall;angle Cut;rolled Edge;intercooled
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2012 - GMC Sierra 2500 HD Extended Cab Pickup 78.8 V 8 Cyl 6.6L 403 6599
Magnaflow
2018 GMC Sierra 1500 Exhaust System Kit 8 Cyl 6.2L Magnaflow - MF Series Black Cat-Back System

P311-356574C    19374  New

Qty:
977.05
Magnaflow Exhaust System Kit
  • ; Single Passenger Side Rear Exit
  • MF Series Black Cat-Back System
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 2
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 5
    • Tip Finish: Black Coated
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;double Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2018 - GMC Sierra 1500 Crew Cab Pickup 69.3 V 8 Cyl 6.2L 376 6162
Magnaflow
2016 GMC Sierra 2500 HD Exhaust System Kit 8 Cyl 6.0L Magnaflow - MF Series Black Cat-Back System

P311-5E81C3A    19376  New

Qty:
923.61
Magnaflow Exhaust System Kit
  • ; Single Passenger Side Rear Exit
  • MF Series Black Cat-Back System
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Bolt-on
    • Main Piping Diameter: 4
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 2
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 5
    • Tip Finish: Black Coated
    • Tip Length: 13
    • Tip Material: Stainless Steel
    • Tip Type: Welded;double Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Block Engine CID CC
2016 - GMC Sierra 2500 HD Standard Cab Pickup V 8 Cyl 6.0L 364 5967
Magnaflow
2013 GMC Sierra 3500 HD Exhaust System Kit 8 Cyl 6.0L Magnaflow - MF Series Black Cat-Back System

P311-222400D    19377  New

Qty:
1,052.25
Magnaflow Exhaust System Kit
  • ; Dual Split Rear Exit
  • MF Series Black Cat-Back System
  • Product Attributes:
    • Exit Style: Dual Split Rear
    • Inlet Connection Type: Bolt-on
    • Main Piping Diameter: 3.5
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 4
    • Tip Finish: Black Coated
    • Tip Length: 12
    • Tip Material: Stainless Steel
    • Tip Type: Clamp-on;double Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Block Engine CID CC
2013 - GMC Sierra 3500 HD Standard Cab Pickup V 8 Cyl 6.0L 364 5967
Magnaflow
2016 GMC Sierra 1500 Exhaust System Kit 8 Cyl 6.2L Magnaflow - MF Series Black Cat-Back System

P311-25E6B5C    19378  New

Qty:
1,007.06
Magnaflow Exhaust System Kit
  • ; Dual Same Side Behind Passenger Rear Tire Exit
  • MF Series Black Cat-Back System
  • Product Attributes:
    • Exit Style: Dual Same Side Behind Passenger Rear Tire
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 3.5
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 4
    • Tip Finish: Black Coated
    • Tip Length: 15.375
    • Tip Material: Stainless Steel
    • Tip Type: Welded;double Wall;angle Cut;folded Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Bed Length Block Engine CID CC
2016 - GMC Sierra 1500 Crew Cab Pickup 78.9 V 8 Cyl 6.2L 376 6162
Magnaflow
2003 GMC Sierra 2500 HD Exhaust System Kit 8 Cyl 6.6L Magnaflow - Custom Builder Pipe Kit Diesel 4in. Downpipe-Back

P311-33181C1    17880  New

Qty:
408.15
Magnaflow Exhaust System Kit
  • ; Single Passenger Side Rear Exit Federal Emissions Equipped without Catalytic Converters
  • Custom Builder Pipe Kit Diesel 4in. Downpipe-Back
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 4
    • Pipe Material: Stainless Steel
    • Series: Custom Builder
    • Subtitle: Downpipe-back
Brand: Magnaflow
Additional Fitment Information:
Vehicle Body Block Engine CID CC
2003 - GMC Sierra 2500 HD Extended Cab Pickup V 8 Cyl 6.6L 403 6599
Magnaflow
2020 GMC Sierra 1500 Exhaust System Kit 6 Cyl 4.3L Magnaflow - MF Series Stainless Cat-Back System

P311-1742703    19469  New

Qty:
857.46
Magnaflow Exhaust System Kit
  • ; Single Passenger Side Rear Exit
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 3
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 4
    • Tip Finish: Polished
    • Tip Length: 12
    • Tip Material: Stainless Steel
    • Tip Type: Welded;double Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Block Engine CID CC
2020 - GMC Sierra 1500 V 6 Cyl 4.3L 262 -
Magnaflow
2020 GMC Sierra 1500 Exhaust System Kit 8 Cyl 5.3L Magnaflow - MF Series Stainless Cat-Back System

P311-1742703    19469  New

Qty:
857.46
Magnaflow Exhaust System Kit
  • ; Single Passenger Side Rear Exit Excludes Sierra 1500 Limited
  • MF Series Stainless Cat-Back System
  • Product Attributes:
    • Exit Style: Single Passenger Side Rear
    • Inlet Connection Type: Clamp-on
    • Main Piping Diameter: 3
    • Muffler Finish: Polished
    • Muffler Material: Stainless Steel
    • Muffler Quantity: 1
    • Muffler Type: Straight-through
    • Pipe Material: Stainless Steel
    • Series: Street
    • Subtitle: Cat-back
    • Tip Diameter: 4
    • Tip Finish: Polished
    • Tip Length: 12
    • Tip Material: Stainless Steel
    • Tip Type: Welded;double Wall;angle Cut;rolled Edge
Brand: Magnaflow
Additional Fitment Information:
Vehicle Submodel Block Engine CID CC
2020 - GMC Sierra 1500 Base V 8 Cyl 5.3L 325 5328

Latest Car Advice

CarJunky AutoAdvice

Starter 1991 GMC

Showing 2 out of 2 Posts
Question From bedell47 on Starter 1991 GMC

I have a 1991 GMC Jimmy that I need to put a new starter on. My question is will it drop straight down or do I need to remove the crossover exhaust pipe or jack the motor up a little. It is a 4.3 v6 4 wheel drive 2 door vehicle. I have been both by friends and was just wondering if anyone knows for sure before I start. Thanks Chip

Response From Jeff Norfolk Top Rated Answer

It will come out with out removing exhaust. It takes a bit of fanagiling but it will come out.

Just a side not: Be sure to disconnect the battery before you start the job.

1984 GMC Pickup Backfires

Showing 2 out of 5 Posts | Show 3 Hidden Posts
Question From Gmconyx on 1984 GMC Pickup Backfires

1984 GMC Pickup backfires when i left off the gas on the freeway. Even in my driveway the pickup backfire when i rev it up. It backfires so bad that my catalitic converter blew.

Response From PTEC

explain to me what is a backfire and how can you tell if it is a backfire, then i will see what i can do for you.

Response From Gmconyx

The truck backfired and blew the catalitic converter and the muffler expanded them. The sound that the truck makes is that of a canon going off. On the freeway, when I let go of the gas you can hear a big boom and feel like a big firecracker just blew under your ass.

Response From black bear Top Rated Answer

if you have a large enough exhaust leak it will back fire

Response From steve01832

Start with a compression test across the board. If it is low on all cylinders, check the timing chain to see if it jumped or has excessive slack in it. If your vehicle has an air pump and it is operational, make sure the solenoid is diverting the air in closed loop. If it is sending the air downstream you will have the makings for heavy combustion in the converter. One way to check this is to pinch off the hose at the air pump that goes to the converter and drive the truck. If the backfire stops, you know which system has failed. Good luck and keep us posted on what you find.

Steve

Timing a 1995 GMC C2500 7.4 L.

Showing 3 out of 4 Posts | Show 1 Hidden Posts
Question From Steve F. on Timing a 1995 GMC C2500 7.4 L.

I cannot find, after exhaustive searching, the EST connector, on my 95 GMC 7.4L, in order to check the timing, can I jump the ADL link, instead, if so, which pins, Thank You.

Response From Discretesignals

Put the IC system in the bypass mode by disconnecting the "set timing" connector. This is a single wire sealed connector that has a tan with black stripe lead. This connector breaks out of the wiring harness below the heater case in the passenger compartment.

Base timing is 4 degrees BTDC.

Jumping the ALDL won't put the ignition control module into base mode.

Response From Steve F. Top Rated Answer

I know it's supposed to, but like I said, I just cant find it there.

Response From Hammer Time


2000 gmc jimmy p0300 code

Showing 2 out of 2 Posts
Question From barstowjohn on 2000 gmc jimmy p0300 code

I have a 2000 gmc jimmy that wants to start sometimes and others it wont. When it is running it idles and drives fine untill about 55mph. I did a solid tune up so cap rotor, pcv, airflow sensor. fuel pump seems to be working fine but i lose power and can hear the engine missing at about 55, HELP...

Response From Hammer Time Top Rated Answer

Check it for restriction in the exhaust and test the fuel pressure.

91 GMC

Showing 2 out of 6 Posts | Show 4 Hidden Posts
Question From ednoid on 91 GMC

Hi. I have a '91 GMC 1500 w/5.7 It starts no problem, but when excellerating it will pop, like a back fire, then runs like it fouled a plug. I've changed the injecters in the TBI, checked vacuum lines, tested the EGR valve the old fassioned way...rev the motor and see if the diaphram moves. Plugs are new. Good wires...etc. Any idea? It almost seems like vacuum advance isn't funtioning properly, but not sure how to check.

Any help would be appreciated.

Response From Discretesignals Top Rated Answer

Does it backfire out the exhaust or intake?

Response From ednoid

Not sure, but thinking intake. It's more of a sputter, pop, like it wants to die thing.

Response From Discretesignals

It might be a lean back fire on acceleration. Have you watched your fuel pressure when you accelerate to see if it drops out from lack of volume?

If you have a scan tool or volt meter, you can watch the O2 sensor voltage with the O2 hot and working. The voltage should peg at .9 volts (rich), when you get on it. If the O2 voltage doesn't peg, you don't have enough fuel getting into the combustion chambers.

You could have an ignition problem, but most the time ignition problems cause a backfire out the exhaust.

Another possibility is a leaking intake or exhaust valve under high pressure. Pressure in the cylinders is really high under WOT (wide open throttle) acceleration.

Response From ednoid

It only does it while driving, not while in neutral, so I don't know if I can test the O2 censor. I do hear a ticking. Sounds like a valve or lifter. I thought it was the header leaking, but thinking the former now. Thanks for the help and for spelling acceleration. I thought I was spelling that wrong.

Response From Tom Greenleaf

Just a thought - did you maybe drop any spark plugs when putting new ones in?

T