Question about 1989 Pontiac Firebird

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I have a 89 pontiac firebird Trans Am "GTA" 5.7L tuned port injected. About a week or so ago I changed the TPS. I started the car and it was sounding great and then it sounded like something got sucked into the intake and was flying around in there. It will make that sound and then stop for a few seconds then do it again. I pulled all 4 plugs on the drivers side and one of my plugs the tip is bent down and over. I turn the motor over without the plugs and it makes no pinging sound at all. Is it possible that something got sucked into the cylinder and bent the plug and exited the exhaust and the noise im hearing is from either the valve or piston hitting the plug? Or what could it possibly be?

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  • Lee Mee Sep 11, 2009

    Also after this happend I removed the intake manifold and Tuned port injection just to see if there was and metal in there because like i said it sounds like a bolt or screw flying around in there< and it had so much carbon build up. Could my problem be a sticking valve or a stuck valve do to Carbon build up or something? What can I put inside the cylinder and/or on the valves to clean and lubricate them just to make sure??



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Very possible and you lucky it only damaged the spark plug as far as yoiu can tell so far. proabably a screw or nut from the air cleaner or tps mounting, could have been something from a shirt pocket if you were leaning over the area. seen it all in 29 years...

Posted on Sep 11, 2009

  • Jeff Phillips
    Jeff Phillips Sep 11, 2009

    If your looking for an additive to clean the carbon off valves use Z Max by far the best... I will get back to you on the other issue...


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If something did indeed get sucked in, it is probably stuck to the piston, comes loose, gets stuck, comes loose. To check this go to your local parts store and see if they have a bore scope for rent, so you can see into the cylinder from the spark plug hole. If you cannot get the tool, you may have to remove the cylinder head to check.

Posted on Sep 11, 2009


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