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vee93

Well-known member
Joined
Nov 15, 2002
Messages
585
Location
Mississippi
Corvette
1993 Medium Quasar Blue Metallic Coupe
Well, had a tune-up done 2 days ago. Took the Vette home and parked it. Took the Vette on a tour of the countryside today. Mostly cruising, but make a few annoyances specks in the rearview. Got home, parked and noticed smoke billowing out around the car. WTF?! Popped the hood and saw smoke coming from the right rear engine area . :eek:hnoes
So. WHAT GASKET IS LEAKING?! Main seal? :hb
 

B17Crew

Well-known member
Joined
Oct 8, 2002
Messages
1,610
Location
Columbus, Ohio
Corvette
96 LT4 Polo Green/Light Beige Interior
Your problem could be just about any gasket, although I had an experience similar to yours once with my ’94 six-speed coupe.

I had the same symptoms as you described. Servicing dealer informed me that a speed sensor gasket failed. Thought the car was on fire at first. I think I had around 50,000 miles on the car when it happened. Turned out to be nothing major.

On the same car, the rear main seal needed to be replaced, only symptoms that the car had was a slow oil drip (noticed the oil on the garage floor). I had not experienced any type of smoke with this leak.

Good luck and please keep us posted!

B17Crew
:w
 

vee93

Well-known member
Joined
Nov 15, 2002
Messages
585
Location
Mississippi
Corvette
1993 Medium Quasar Blue Metallic Coupe
Just took the Vette for a quick test spin up on the interstate. No smoke this time, but I didn't dare drive it as long as I did earlier. Plus, it's about 25 degrees cooler out now. The car did hesitate/stumble when I took off from a stoplight. I don't know if that was me driving tentatively or a vacuum leak somewhere. There are now about 3, quarter-size drops of oil on my driveway tonight. Juuuust great.
 

B17Crew

Well-known member
Joined
Oct 8, 2002
Messages
1,610
Location
Columbus, Ohio
Corvette
96 LT4 Polo Green/Light Beige Interior
Three quarter size drops of oil... there’s definitely an oil leak. On the brightside, it’s one of those problems that’s easy to diagnose.

With the rear main seal leak I had, I didn’t experience any driveability problems. I had the dealer handle that one as it was too involved for my skill level.

Please let us know what you uncover.

B17Crew
:w
 

John Robinson

Gone but not forgotten
Joined
May 3, 2005
Messages
1,555
Location
Muncie, Indiana
Corvette
1993 Polo Green Coupe
Just a guess but with what you said about smoke and drivability I would think perhaps the rocker cover gasket is leaking over plugs and onto the exhaust manifold. Let us know what you find:beer
 
U

urleycay

Guest
leak

could be valve cover gasket leaking on exhaust manifold (smoke) or a common problem is rear of intake manifold. that was my problem leaving small drops of oil on floor. changed intake and while i had it off i did valve cover gaskets. no more leaks
 

G Winter

Well-known member
Joined
Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
When they tuned it did they replace the PVC ? Not sure where the PVC plugs into but if it goes in the valve cover maybe it wasn't put in properly and came out.

Glenn
:w
 
U

urleycay

Guest
pvc

the pvc is located in the intake plenum, i want to say drivrs side but i am not looking at my engine right now. it has a U shaped hose attached to it. now this is for a LT-1 application
 
Joined
Jun 20, 2002
Messages
2,509
Location
Tallahassee, FL
Corvette
none right now :(
Tune up + hesitation + Oil leak. Wonder if that = a loose spark plug?

If whoever you took it too did a rush job, or just didn't give a crap they may have not tightened down the rear most plug (which is a real PITA to get to).

This simple problem would cause all the symptoms you have described... especially considering you have smoke coming out of the engine compartment, the oil would almost have to leak directly on the header for it to be hot enough to burn synthetic off like that.
 

Vinces87

Member
Joined
Aug 24, 2007
Messages
14
Location
Mountain View, CA
Corvette
1987 Gray Convertible
After I had a head gasket job I noticed a few days later smoke coming from under my hood and actully blowing into the car. I took it in and was told it looked like some oil sensor...it wasn't. Then another shop said it looked like it was coming from a catalytic. Now I'm wondering if someone actually knows. I decided to take it to the shop that installed the cat's for me. He raised it up and went straight to the rear exhaust manifold gasket. Turns out the oil was dripping on the catalytic as well as the oil filter, etc. He qouted me 4 hours of labor and invited me to bring the gasket set to him. Ordered one from a dealer and now I finally enjoy the car without worrying about fumes.

I realize this is Month's old, but I think this might be an issue with others as well.
 

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