Here is my story. I had test pipes before that blew out both my o2's. I ran with no o2's for about 4 months (school+no job). I recently bought new megan test pipes and brand new o2's, thinking my car would run flawlessly like it did when I first put this set up on the road.

My car is spitting out tonnes of raw fuel from the exhaust in the form of white smoke. By tonnes I mean clouds fountaining out of the exhaust pipes and covering the street. This only happens when the car has reached operating temp and only at idle. After I set off, the car leaves behind a thick cloud of smoke and then leans out the mixture, until the next stop light where i come to an idle.

I have vibrant performance o2 fittings (They are non-foulers plugs with various diameters for the male end).

The car is a 2003 g35 coupe, 6mt. Apex-i WS2 catback, megan test pipes and y-pipe. Brand new rear o2 sensors were fitted last week, the car ran without smoke for a few days, then this happens.


There are no signs of a head-gasket leak, coolant is at the same level it was when i checked it last (8 months). Car doesn't burn oil and runs strong.


So I am confused. Input?


Thanks.

 

Sounds like you might have an engine oil leak

 

Raw fuel is black smoke, not white.

Black = rich/unburnt fuel
Bluish grey = oil
White = coolant

You might have bigger issue than anything o2 related.

 

Yea white smoke has nothing to do with fuel. It is coolant related. Having test pipes might just show you there is a problem, test pipes no matter what brand won't cause you to suddenly leak coolant unless you somehow screwed something up with the install. I have Megan test pipes with no issues for 3 years now.

 

im having the same problem with my megan test pipes also. after i put on my new invidia exhaust and megans it started smoking. before it had cats and a custom ugly exhaust and never smoked like this before. my coolant is the same level, oil is but gets black quick ( i beat on it ). im thinking its the test pipes also because it doesnt smell like coolant and doesnt seem like a headgasket problem. let me know if putting back the cats or changing test pipes work

 

My test pipes did smoke at first. Went away after a few thousand miles.

 

Car is gone ladies and gentlemen. I never solved the problem. Sorry.