Thread: Valve tapping

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  1. #1 Valve tapping 
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    I took my car to a summit point raceway while running stock weight oil and my car developed a pretty loud valve tapping. Ended up putting heavier weight oil in and running 10+ laps with no power issue but I'm wondering if it's potential spring fatigue making my valves make a tapping noise.
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  2. #2 Re: Valve tapping 
    GXP Level Member GTPpower's Avatar
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    I would guess it's a lifter.
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  3. #3 Re: Valve tapping 
    GrandPrix Junkie
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    I would say we need more info on what year, any mods to it, mileage, etc. Taking a car to a track and beating on it and then getting a loud tapping noise is usually not good.
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  4. #4 Re: Valve tapping 
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    It's a 2000 Pontiac Grand Prix with the L67 motor, I have a 3.4 inch pully, headers, straight pipe, colder plugs and that's really it. Coolent temps got up to 210 before I'd go easy on it. I have a video of the tapping should I post it on YouTube and post the link here ?
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  5. #5 Re: Valve tapping 
    GXP Level Member GTPpower's Avatar
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    You probably spun a rod bearing.
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  6. #6 Re: Valve tapping 
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    Update: I've replaced the rockers, push rods, springs, retainers, valve covers and the gasket for it, but the sound is the same so I'm probably looking at a spun baring but it just doesn't sound loud enough
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  7. #7 Re: Valve tapping 
    GTP Level Member wowitsfast's Avatar
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    GTPpower mentioned a lifter at the very beginning.

    Did you check those while you had it blown apart?

    You probably didn't take the blower and lim off but, may have to now.

    I would agree with you that there is a difference between a tapping and a knocking.

    Did you put stiffer springs in while you were in there?

    Sent from my SM-N920V using Tapatalk
    Just a bunch of junk thrown together http://www.grandprixforums.com/membe...ht=wowitsfasts
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