368 LT5 Drinking oil - ZR-1 Net Registry Forums

Mitsumark · 01-14-2014

Ahh..As if I haven't had enough problems this week with a busted pipe in my house,my wife falling,,now my Z is drinking oil..Literally..Here's what's going on.Hopefully one of you LT5 pros could shed some light on what may be happening..My car is a 91 and has a Vette Doctors built 368 with all the other goodies(headers,flywheel,gears,Marc H tune,ect)The car has also had a very recent service including coils,FIC stainless injectors,plugs,fuel filter,and Jerry's new PCV hose assembly along with new PCV valves..About 2 weeks ago I noticed a trail of Blue taillight smoke under medium/moderate acceleration..Yesterday I'm warming up the car and noticed it is smoking lightly out of the tailpipes just idling.It seems to come and go..However the car has drank 2 qrts of Mobil 1 in the last 300 miles..It is absolutely oil as the oil light came on,the smoke is clearly Blue and it stinks to high heaven.If I blip the gas quickly 3-4 times back to back the smoke becomes heavier and heavier until I stop..I haven't checked compression but I am suspecting a burnt exhaust valve..It idles a bit rough, although it always did..If I hammer it in any gear it doesn't miss a beat.It pulls very strong..There are no CEL light on and the secondaries seem to be working fine..The car also starts without smoke cold..This progresses as it gets hot.So far I've checked for vac leaks and found nothing..I also double checked the PCV valves and there is plenty of suction present while idling.I removed the oil cap and oil dipstick to see if there was any blowby present and there was non that I can see..There are also no external oil leaks as I've checked thourally..This is definitely tailpipe smoke..So what I have is an LT5 with a working PCV system and it's dumping oil into the combustion chamber..Is there any specific entry points I can check before I start suspecting valves or rings?I did drive through a few heavy misfires a few weeks ago when it had a suspect bad coil..Maybe I hurt it then?Help me guys..

01-14-2014	#1
Mitsumark Join Date: Aug 2013 Location: NJ Posts: 117	368 LT5 Drinking oil Ahh..As if I haven't had enough problems this week with a busted pipe in my house,my wife falling,,now my Z is drinking oil..Literally..Here's what's going on.Hopefully one of you LT5 pros could shed some light on what may be happening..My car is a 91 and has a Vette Doctors built 368 with all the other goodies(headers,flywheel,gears,Marc H tune,ect)The car has also had a very recent service including coils,FIC stainless injectors,plugs,fuel filter,and Jerry's new PCV hose assembly along with new PCV valves..About 2 weeks ago I noticed a trail of Blue taillight smoke under medium/moderate acceleration..Yesterday I'm warming up the car and noticed it is smoking lightly out of the tailpipes just idling.It seems to come and go..However the car has drank 2 qrts of Mobil 1 in the last 300 miles..It is absolutely oil as the oil light came on,the smoke is clearly Blue and it stinks to high heaven.If I blip the gas quickly 3-4 times back to back the smoke becomes heavier and heavier until I stop..I haven't checked compression but I am suspecting a burnt exhaust valve..It idles a bit rough, although it always did..If I hammer it in any gear it doesn't miss a beat.It pulls very strong..There are no CEL light on and the secondaries seem to be working fine..The car also starts without smoke cold..This progresses as it gets hot.So far I've checked for vac leaks and found nothing..I also double checked the PCV valves and there is plenty of suction present while idling.I removed the oil cap and oil dipstick to see if there was any blowby present and there was non that I can see..There are also no external oil leaks as I've checked thourally..This is definitely tailpipe smoke..So what I have is an LT5 with a working PCV system and it's dumping oil into the combustion chamber..Is there any specific entry points I can check before I start suspecting valves or rings?I did drive through a few heavy misfires a few weeks ago when it had a suspect bad coil..Maybe I hurt it then?Help me guys..