Gas in oil smell in a 2002 chevy cavalier


#1

replaced Fuel Pressure Regulator but still notice smell of gas and sometimes at start up rough idle.


#2

I’d check if you have a rotten fuel line/hose in the engine bay, or maybe an externally leaking fuel injector

Another possibility is that you have a MASSIVE intake or exhaust leak, and the pcm is commanding more fuel, in an attempt to maintain the correct air/fuel ratio

Some intake leaks somewhat seal up as the engine warms up, thus the rough idle only at cold start up

Let me clarify about the exhaust leak . . . if there is a leaking exhaust manifold gasket, the oxygen sensors will pick this up, and the pcm will command a lot more fuel


#3

The only way gas can get into the oil on a fuel injected engine is either a leaking fuel pressure regulator or a leaking injector.

Tester


#4

@Tester

“The only way gas can get into the oil . . .”

What are you talking about?


#5

Look at the title of the post.

Tester


#6

Gas in oil is common in cold weather with worn rings if the engine doesn’t get fully warmed up. Blow by will do that. So @rexair , tell us exactly what you mean - is this when you smell the dipstick?


#7

@Tester

You’re right . . . I missed that

I wonder why he’s so sure that gasoline has found its way into the crankcase . . . ?

I’m suspecting there’s some vital information missing

such as hard starting . . . or maybe he changed the oil and it smelled like it was diluted with gasoline


#8

+1 to texases’ comment.

Can the OP tell us about the normal driving patterns for this car?
If those patterns include a lot of short-trip local driving, then this problem would not be that unusual with 14 year old engine.