Thread: 99 GP 3100 engine noise

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  1. #1 99 GP 3100 engine noise 
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    Just got this 99 guy told me it needed a fuel pump (it did),started it up,thought the tick tick was the familiar piston slap I've heard on so many 3.1's.But as the engine warmed up the noise didn't go away.I can make the noise stop by disconnecting the plug wire to the center plug on the front(is that #2 or #4?).Is this a rod knock or could the valve train,say a collapsed lifter be causing this?
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  2. #2 Re: 99 GP 3100 engine noise 
    Moderator Russosaur's Avatar
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    If you can get a video and upload it, it would help a lot.
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  3. #3 Re: 99 GP 3100 engine noise 
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    Have you checked that plug is torqued down correctly? A leaking plug could cause a tick
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  4. #4 Re: 99 GP 3100 engine noise 
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    Could be an exhaust leak too.
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  5. #5 Re: 99 GP 3100 engine noise 
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    Quote Originally Posted by Russosaur View Post
    If you can get a video and upload it, it would help a lot.
    Here's a video. Loud noise goes away with #4 plug unplugged,still has noise,possibly the normal piston slap.
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  6. #6 Re: 99 GP 3100 engine noise 
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    Did you ever figure this out?
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  7. #7 Re: 99 GP 3100 engine noise 
    GrandPrix Junkie CrazyGuy03's Avatar
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    Bearing
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  8. #8 Re: 99 GP 3100 engine noise 
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    Quote Originally Posted by michael redmon View Post
    Did you ever figure this out?
    Gave the car to my daughter as is,she`s been driving it as is for the last 2 years,even some long trips (6 hours).Noise never gets worse,engine has good power.Embarrassing when you start it in a parking lot full of people,but she doesn`t seem to mind.
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  9. #9 Re: 99 GP 3100 engine noise 
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    I think bearing because when you removed the combustion force from that cylinder , the knock went away
    when the oil warms up and you build pressure the knock goes away

    so I suspect rod bearing
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  10. #10 Re: 99 GP 3100 engine noise 
    GT Level Member mguzzo's Avatar
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    ^^ thinking the same thing. clearly a rod knock
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  11. #11 Re: 99 GP 3100 engine noise 
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    Funny it keeps rolling along. My car is loud as heck also but runs nice.
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  12. #12 Re: 99 GP 3100 engine noise 
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    So this is basically my car also except the noise only occurs under load. So if at idle and I rev the engine the. Nothing. Driving under load and I give it gas I get.the noise.

    Any ideas? I would like to fix it.
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  13. #13 Re: 99 GP 3100 engine noise 
    GrandPrix Junkie CrazyGuy03's Avatar
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    Well like stated above or flex plate are tso possibilities
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  14. #14 Re: 99 GP 3100 engine noise 
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    Sounds like a valve train noise..a.rod knock is usually a lower sounding thump...that sounds like a lifter or valve...did you pull the valve covers and inspect and run the engine?
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