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? 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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  • Lee Mee Sep 11, 2009

    I have been aroung alot cars and I did not thing it sounded like a valve to me but i could be wrong. What can I put on or in the cylinder to help free the valve just incase?

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  • Pontiac Master
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U HAVE SOMETHING INSIDE THE CYLINDER, REV THE HECK OUT OF THE ENGINE AND HOPE IT BLOWS OUT, IF IT DOESN'T U WILL NEED TO PULL THE HEAD OFF, SO U HAVE NOTHING TO LOOSE..

Posted on Sep 11, 2009

  • yadayada
    yadayada Sep 11, 2009

    since i am not there I am just making a guess, the plug being damaged is the key to my suggestion, how would a stuck valve cause that?

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