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CarJunky AutoAdvice

how is fuel getting in the oil

Showing 2 out of 8 Posts | Show 6 Hidden Posts
Question From ady1234uk on how is fuel getting in the oil

Year: 2000
Make: renault
Model: megane scenic
Engine size: 1.6 16v
Mileage: 104000

ive had the spark plugs out thay are carbon black the car stinks of petrol when running and some white smoke when running any idles

Response From ady1234uk

its the piston rings thanks for all the help

Response From Sidom

I'm not familiar with that particular model but it sounds like it's running too rich....

You could start with looking at some of the temp sensor inputs for the computer. If the coolant or air temp sensors get skewed and tell the comp it's -40° when it's not, that will cause it to run very rich.....

If you have a fuel pressure gauge, hook it up and take a pressure reading. Find out the specs for this model, make sure it's not too high and that the pressure holds with the key off. If it doesn't hold, a couple of things that could be a bad diaphragm in the pressure regulator or leaky fuel injector........

Response From re-tired

Hi sidom just thought i would give another angle. Black plugs and black exhaust i would say rich ,as you stated. However , black plugs and white or greyish white exhaust ,I would say oil consumption. .Worn/cracked rings could give you oil in combustion chamber and fuel in the crankcase. IMO

Response From Sidom Top Rated Answer

Yup, thats another very good possibility. I missed the white exhaust part... Now I'm curious if there is any coolant loss going on with that as well

A good way to double check the worn ring problem would be to block off the pcv valve & hook a vacuum/pressure gauge to the dipstick tube and see if you are getting too much crankcase pressure......

With a scope & FLS (first look sensor) you can actually see the individual pulses of each compression event which would help narrow down the problem child....No offense to the poster but i doubt if he has that type of set up but vac gauges are faily inexpensive........

Response From ady1234uk

ive just had a compression test done cyl 1 is 205 cyl 2 is 190 cyl 3 is 200 cyl 4 is 50 the white smoke comes and goes and there is no power loss

Response From Sidom

Looks like RT gets the gold star for this one....

Like Nick mentioned, this is a big problem.....

The next step would be a leakdown test to see where the comp is going. From what you've posted before, bad rings would be the likely culprit...

The only thing bothering me is, the statement of "no power loss". For a 4 cyl engine to lose one cyl, that would be obvious to anyone. I might be tempted to do a running compression test before a leakdown.........

Response From nickwarner

cylinder 4 is 50 pounds? That motor is toast