lm71z Posted February 26, 2009 Share #1 Posted February 26, 2009 My 240z seems to smoke a lot if the car is revved up when it's idling or if the car is cold. Once the car is warmed up it doesn't smoke when it's being driven, but it still smokes a lot if it's revved up when it's idling in neutral. What are all the possible causes of this? I'm thinking it could be a slightly blown head gasket that is causing some water/coolant to mix with the oil. Link to comment Share on other sites More sharing options...
280ZCR8ZEE Posted February 26, 2009 Share #2 Posted February 26, 2009 Sounds like oil ring bypass to me (smokes white , black or blue ? ) just my 2 cents.. Link to comment Share on other sites More sharing options...
lm71z Posted February 26, 2009 Author Share #3 Posted February 26, 2009 Yeah I was thinking the same. The smoke is white. Link to comment Share on other sites More sharing options...
doradox Posted February 26, 2009 Share #4 Posted February 26, 2009 Changed the oil lately?Steve Link to comment Share on other sites More sharing options...
rdefabri Posted February 26, 2009 Share #5 Posted February 26, 2009 Don't necessarily assume ring bypass. It's certainly possible, but these cars are prone to head and / or head gaskets needing replacement.I'd start there and work "down". Do you see any visible oil weeping from the seal between head and block? Link to comment Share on other sites More sharing options...
Zs-ondabrain Posted February 26, 2009 Share #6 Posted February 26, 2009 Time for a valve job or honing of the pistons. Mine does the same exact thing. Bad rings, and valve guides are the colprit.Dave Link to comment Share on other sites More sharing options...
lm71z Posted February 26, 2009 Author Share #7 Posted February 26, 2009 The oil is brand new. I changed it a couple of weeks ago when I first brought the car home. There's no oil seeping out from the seal between the head and the block. Link to comment Share on other sites More sharing options...
hls30.com Posted February 26, 2009 Share #8 Posted February 26, 2009 Just on the offchance, did you put seafoam in the car?Will Link to comment Share on other sites More sharing options...
lm71z Posted February 27, 2009 Author Share #9 Posted February 27, 2009 No I did not. I'm not exactly sure of what that even is. Link to comment Share on other sites More sharing options...
hls30.com Posted February 27, 2009 Share #10 Posted February 27, 2009 It is a combustible fluid that cleans engine internals and smokes white like you can't beileve!Will Link to comment Share on other sites More sharing options...
Travel'n Man Posted February 27, 2009 Share #11 Posted February 27, 2009 Seafoam is great stuff. I always keep some in my garage. Link to comment Share on other sites More sharing options...
stevef1972z Posted February 27, 2009 Share #12 Posted February 27, 2009 What oil did you use?When you pull the plugs what condition are they in? They can help pinpoint the problem. Link to comment Share on other sites More sharing options...
inline6
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now