Smoke from engine 91 vette
Thread Starter
Racer
Joined: Dec 2003
Posts: 349
Likes: 0
From: Hong Kong
Smoke from engine 91 vette
Hi
After driving up steep steep hills in Hong Kong, my 91 vette, I will turn the fan down on my a/c and all of a sudden smoke shoots out from the engine, its more of a misty white smoke than a thick fire smoke. I think it may be related to the a/c not sure if its anything else, happened twice before, whilst running the aircon
Thanks
After driving up steep steep hills in Hong Kong, my 91 vette, I will turn the fan down on my a/c and all of a sudden smoke shoots out from the engine, its more of a misty white smoke than a thick fire smoke. I think it may be related to the a/c not sure if its anything else, happened twice before, whilst running the aircon
Thanks
Team Owner
Joined: Sep 2003
Posts: 25,295
Likes: 4
From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Re: Smoke from engine 91 vette (dailo)
Check for anything (Fluids) leaking on the exhaust system. Then trace them back to the source. If need be try to replicate the smoking while watching with the hood open. Of course, check all your fluids before trying this.
[Modified by VictorRussell'92, 9:17 AM 6/24/2004]
[Modified by VictorRussell'92, 9:17 AM 6/24/2004]
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Smoke from engine 91 vette (dailo)
You may be able to duplicate the smoking condition in your parking lot by raising idle to maybe 2,000-2,500rpm for a few minutes. Then see if you can see where the smoke is comming from and/or what it smells like. Burnt coolant, motor oil and ATF will have a unique odor.
Most likely you are blowing oil or ATF onto the exhaust system; an inspection of the front Y or cats could give you a clue. Since it occurs mostly when going up a grade with A/C on I suspect an oil leak. Under these conditions you have increased cylinder pressure (check your instentaneous mileage) which would pressurize the oiling system too.
Common source of oil leaks can be:
-oil pan seal
-oil pressure sender or switch on top rear of engine
-oil temp sender under engine near oil filter
-front or rear intake base lands
-valve cover gaskets
-rear main seal
ATF leaks could occur from:
-front pump seal
-rear shaft seal
-oil pan gasket
Most likely you are blowing oil or ATF onto the exhaust system; an inspection of the front Y or cats could give you a clue. Since it occurs mostly when going up a grade with A/C on I suspect an oil leak. Under these conditions you have increased cylinder pressure (check your instentaneous mileage) which would pressurize the oiling system too.
Common source of oil leaks can be:
-oil pan seal
-oil pressure sender or switch on top rear of engine
-oil temp sender under engine near oil filter
-front or rear intake base lands
-valve cover gaskets
-rear main seal
ATF leaks could occur from:
-front pump seal
-rear shaft seal
-oil pan gasket
