headrec*

Hey

Well if I go down a hill in gear at a high rpm (say going down a hill at 60mph in 5th gear or better yet 4th gear) after I come off of a high vacuum situation back into giving it gas the car will let out smoke and a decent amount too.

I haven't had a chance to do a compression check on the car but it runs WAY strong so I don't think the numbers will be down. I have checked the pcv and it checked out but I'm going to try replacing it anyways. I just got the car and switched it to semi synthetic oil. I'm just trying to think what could be causing this and see if it is an easy fix or if the motor has some issues. PLEASE Let me know your thoughts. Thanks in advance guys!

headrec*

Anyone???

STI champstar

Could be the rings. What kind of smoke is it.... Blue, black, white? Only happens on decel?

excivicboy96

I have heard that with smoke coming out during decell that it could be the valve guides.

headrec*

Yeah its blue smoke. Changed the pcv valve and nothing. Going to do a compression check tomorrow and see if that holds anything. Anyone else have ideas???

headrec*

And like I said this is only after a heavy vacuum decelerations situation. Like coming down hill going 50 in 3rd gear type of situation. Just after engine braking for a few seconds and giving it gas again it will let out a puff of smoke.

blackKready

id say this problem is associated with rings.

headrec*

145-140-140-140

Those were my numbers on the compression check. High elevation numbers if that makes a difference. SOOOO...now I am confused. Any other ideas?

YoungKadafi

i dont think its an issue, however you are burning oil when you do that.

blackKready

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by headrec* &raquo;</TD></TR><TR><TD CLASS="quote">145-140-140-140

Those were my numbers on the compression check. High elevation numbers if that makes a difference. SOOOO...now I am confused. Any other ideas?</TD></TR></TABLE>

seems kinda low , did you hold wide open throttle while performing test?

headrec*

Yes wide open throttle and like I said high elevation so numbers are always slightly lower.

headrec*

....

mini-e

Oil out the exhaust is often pegged to rings and/or valve guides- compression tests are helpful but vacuum under deceleration could create oil passage that a compression test does not find and the loads on the rings and guides are revered. a compression leakdown test might offer more insight. time to leak the compressed air is a spec i belive, if the rings are not totally shot you can still make compression, it just leaks down faster. back in the old days people would run heaver oil to slow down the burning.

eg8tuner

if it is your valve guides then a compression test isn't goign to tell you that bacause the valves are close you can manually inspect your valves witht the itake manifold and exhaust manifold off by turning the engine over and looking in with a flash light look for oil build up. allso check your spark plugs they will show signs of burning oil