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Blow Heads Or Gasket 1989 Grand Prix 2.8


1989 Pontiac Se
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I have overheating problems back pressure in the radiator water in the motor but it doesnt smoke starts up runs no problem. What does this mean? And if my heads are gone whats the best advice on gettinf this car nack in the road?

 

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Pull the plugs and inspect them. Look for evidence that there's water in the cylinder. Also, look for bubbles in the coolant. You may yet have a failed water pump or thermostat. Don't jump the gun.

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2.8 heads love to get hairline cracks at the spark plug holes. I had a couple sets all the same cracks in the same places. Exhaust gases entered the cooling passage and had overflow bottle boiling. I would guess the heads before the gaskets, but I may be wrong. Ask my wife and I am always wrong lol.

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Okay so i had new ones put in like two days and i drained the watery oil out of the motor and coolant from the radiator. Where do i start as far as diagnosing goes.

 

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I pulled plugs cylinder 4 plug was wet i dried it off and turned car over same scenario only plug thats wet all other pkugs are worn evenly.

 

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Im not trying to be redundant i just want to know. If you dont know if you dont ask.

 

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You have a couple threads basically asking "what can I put into my GP". It's not redundant, but I can see where he's coming from, especially after I told you in another thread that the LH0 would bolt right in where a LB6 resided. Engine VIN "T" is basically the LH0. 

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