Head problems
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Senior Member
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Joined: Jun 2006
Posts: 692
Likes: 1
From: Oviedo,Florida
Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
Head problems
the drivers side of my engines spark plugs have a hole bunch of oil and ash deposits on it and ive had no engine power since ive had the car does anyone no what this is..
Thread Starter
Senior Member
iTrader: (1)
Joined: Jun 2006
Posts: 692
Likes: 1
From: Oviedo,Florida
Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
there new and its on the inside not the outside i was thinking its the valve seals cuz it dont smoke
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Believe it or not but the oil from a leaky valve cover gasket can migrate down onto the spark plugs and get past the threads into the motor. I'd also look at the intake manifold gasket.
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Joined: Sep 2006
Posts: 184
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From: JSS Soto, Tallil IRAQ
Car: 87 IROC-Z28
Engine: 414ci Twin Turbo
Transmission: T56
Axle/Gears: Ford 9"
Hey F-Bird, i just want to confirm my thought with you.
My car drivers side center 2 plugs (#3 and #5) both get covered in oil after about 700-1000 miles eventually causing a misfire on those 2, while all the other plugs are fine. My valve cover gaskets do not leak at all, infact the engine is very very clean on the outside.
I do see a SLIGHT amount of oil where the intake touches the head. Chances are the gasket in this area is bad and is causing the problem, is this correct? Im putting on my HSR soon, so i guess i will find out soon enough.
Thread Starter
Senior Member
iTrader: (1)
Joined: Jun 2006
Posts: 692
Likes: 1
From: Oviedo,Florida
Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
haha those are my 2 plugs 2 looks like the same prob wuts a HSR
Member
Joined: Sep 2006
Posts: 184
Likes: 0
From: JSS Soto, Tallil IRAQ
Car: 87 IROC-Z28
Engine: 414ci Twin Turbo
Transmission: T56
Axle/Gears: Ford 9"
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Thread Starter
Senior Member
iTrader: (1)
Joined: Jun 2006
Posts: 692
Likes: 1
From: Oviedo,Florida
Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
ooo let me no if that was the prob
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