2003 Pontiac Grand Prix supercharged smoking from the valve cover

40

Asked by Joe_butler03 Feb 05, 2020 at 10:10 PM

Question type: Maintenance & Repair

So I have a 2003 Pontiac Grand Prix with a 3.8 l
supercharged and the people who owned it before
I did always ran 87 I decided to put 89 it and the
day that I put that fuel in it it started smoking from
around the valve cover I pulled the valve covers off
replace the valve cover gaskets and it still did the
same thing and then I thought well maybe it could
be the intake manifold gaskets and I pulled the
intake manifold and the supercharger and I
replaced both of those gaskets and it still did the
same thing so now I'm in need of some help please
someone be able to answer my question why is my
car still smoking from around the exhaust manifold
and valve cover.also if I take my oil fill cap off
when the car is running it does not smoke at an
idle but whenever I give it a rev it shoots smoke out
of the oil fill cap and smells like burnt oil.

11 Answers

305,095

I would be running premium gas, not regular or mid grade fuel.

1 people found this helpful.
305,095

I think you have a valve cover gasket leak however the PCV may not be working properly and the resulting internal engine pressure is forcing oil out the valve covers. Your engine may also be worn and have excessive blowby.

1 people found this helpful.
125,045

FOR is spot on! Your supercharged Grand Prix (GTP Model) requires premium gasoline with an octane rating of 93 or higher! Replace the PCV valve. A PCV (Positive Crankcase Ventilation) system that's clogged or otherwise not working correctly causes internal pressure to build up in the engine crankcase. This will force oil out of your valve cover gaskets, timing cover gasket, oil pan gasket, and possibly any other place oil can leak out of! Make sure any PCV hoses are clear too. You should also note that your Grand Prix is under factory recall to have the front valve cover and gasket replaced for oil leaking onto the hot front exhaust manifold which can cause a fire in the engine compartment! Your local GM Dealer will do the recall for you for free! Hope that helps! Jim

40

Thank you guys for that I also wanted to tell you I replaced the front valve cover and valve cover gasket. I had the pcv valve off and it was covered in oil and was loose and just didn't seem right thank you guys for the help.

1 people found this helpful.
40

Also do I need to drain all of the other fuel out and replace PCV valve and it should be fine?

125,045

You're welcome. Glad to help! You don't need to drain the fuel out. You can add a bottle of octane booster to this tank of gas. Then start using the premium at your next fill up. Jim

40

Thanks Jim I also want to mention that I have put a bottle of octane booster in the car when I filled up with 89. So should I put another bottle in?

1 people found this helpful.
125,045

You're welcome. Glad to help! No, with the bottle of octane booster you already put in you'll be fine. Jim

40

Hello, guys once again, sadly I replaced the PCV valve and it changed noting the engine still smokes when revved and also I've now noticed a little valve tapping sound. please help thanks.

1 people found this helpful.
125,045

What color is the smoke? Is this a high mileage vehicle? Jim

40

It is a grey/ blue color and the engine only has 135k

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