Thread: 98 GTP engine hits and tac stops working

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  1. #1 98 GTP engine hits and tac stops working 
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    I have a 98 GTP road warrior with 168,000. When driving down the highway I hear a thump sound, feel something like the engine seized and the tac stops working. It is a very noticeable jolt sound. It has happened three times now. When restarted the tac always works. The engine mounts I can see all look and feel good. No noticeable oil or antifreeze in the engine compartments. A little oil in the water.

    Any love on this problem from anyone?
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  2. #2 Re: 98 GTP engine hits and tac stops working 
    I live here. Slick2500's Avatar
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    Does the engine die after this thump?
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  3. #3 Re: 98 GTP engine hits and tac stops working 
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    No, it keeps running. No temp increase or anything. It seems like a seizure or a extremely large backfire. Every keeps working but the tac dies, but starts working again after the engine is restarted again.
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  4. #4 Re: 98 GTP engine hits and tac stops working 
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    Cruise control keeps working too. I hope my warrior is not sick, this is my second one, the Grand Prix is a tough car and hard to kill except for the trany after 150K.
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  5. #5 Re: 98 GTP engine hits and tac stops working 
    Killa Bee Scottydoggs's Avatar
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    sounds like a bad crank sensor. the buck may be the engine stalling and then re firing up.

    common sings of a bad crank sensor is the tach drops to zero, and then it stalls, may or may not fire right back up. some times a hr later it will start, or the next day. and it almost never sets the check engine light.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: 98 GTP engine hits and tac stops working 
    I live here. Slick2500's Avatar
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    Yeah that is what I was thinking too scotty but he says it doesnt die so.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  7. #7 Re: 98 GTP engine hits and tac stops working 
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    Yea she keep working, just makes me worry. What would feel like a catastrophic failure, make the entire car feel like she hit a large dog or small calf, kill the tac but keep on working?
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  8. #8 Re: 98 GTP engine hits and tac stops working 
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    Other than the Grand Prix is the most awesome car ever engineered. I love my Prix!!!!!!!
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  9. #9 Re: 98 GTP engine hits and tac stops working 
    I live here. Slick2500's Avatar
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    Well it still could be a bad crank sensor or one that is going bad anyway.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  10. #10 Re: 98 GTP engine hits and tac stops working 
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    How would I diagnose that? Cant find it in my Haynes book.
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  11. #11 Re: 98 GTP engine hits and tac stops working 
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    Thanks slick!!!!
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  12. #12 Re: 98 GTP engine hits and tac stops working 
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    I have to drive about 300 miles in the next two days, perhaps I should rent a car from hotwire for $15/day lol.
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  13. #13 Re: 98 GTP engine hits and tac stops working 
    Turbo is the way to go. BillBoost37's Avatar
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    This is slmost guaranteed to be a crank sensor.

    If you watched the parmeters, you would see the run time counter reset. My first crank sensor did this hiccup, which is technically a stall and restart. Oddest part of mine was the tach never quit. The shifter light did blink though. Because it was the pcms way of saying "you started in a drive gear". Which we all know..isn't supposed to be possible.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  14. #14 Re: 98 GTP engine hits and tac stops working 
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    Thanks everyone, looks easy.

    Here is a link with diagrams:
    I have a 98 Pontiac Grand Prix. Where is the crankshaft position - JustAnswer
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  15. #15 Re: 98 GTP engine hits and tac stops working 
    Killa Bee Scottydoggs's Avatar
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    http://www.grandprixforums.net/how-r...sor-60906.html here the one off the site here. with real pics. nut and bolt sizes.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #16 Re: 98 GTP engine hits and tac stops working 
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    To me it sounds like the pin in the differential is walking out.. I've had it happen in a gtp and a Dodge stratus.. you will be driving and hear a bang, motor will stop dead in it's Tracks if the torque converter is locked and it happens like if your on the freeway.. if it gets worse it will eventually start to lock up the front wheels, yes even at 65mph on the freeway there will be a 1 second front tires lock up. Eventually you will blow the entire diff and case off the trans... Rebuild the diff now while it can be done with the trans still in the car..
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  17. #17 Re: 98 GTP engine hits and tac stops working 
    Killa Bee Scottydoggs's Avatar
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    Quote Originally Posted by mark97564 View Post
    To me it sounds like the pin in the differential is walking out.. I've had it happen in a gtp and a Dodge stratus.. you will be driving and hear a bang, motor will stop dead in it's Tracks if the torque converter is locked and it happens like if your on the freeway.. if it gets worse it will eventually start to lock up the front wheels, yes even at 65mph on the freeway there will be a 1 second front tires lock up. Eventually you will blow the entire diff and case off the trans... Rebuild the diff now while it can be done with the trans still in the car..
    its great you want to help out. but your waking up threads that are years old. like this one is from 2013........your pages deep lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  18. #18 Re: 98 GTP engine hits and tac stops working 
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    I know.. I'm reading everything and it may be a old thread but they ones I read without conclusions I figure why not give my 2 cents to anyone that still drives these cars.... Like me lol
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