Thread: Luke's GTP

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  1. #501 Re: Luke's GTP 
    Killa Bee Scottydoggs's Avatar
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    prop the head so the valves are up, then pure some break cleaner or other liquid over the valves, see if it leaks out past the seats.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #502 Re: Luke's GTP 
    GTP Level Member wowitsfast's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    prop the head so the valves are up, then pure some break cleaner or other liquid over the valves, see if it leaks out past the seats.
    would bad seat give him crap compression?

    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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  4. #503 Re: Luke's GTP 
    Killa Bee Scottydoggs's Avatar
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    sure would. if its leaks liquid, it leaks even more air.

    if you do this test, tap both valves on the spring side to make sure they are seated fully.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #504 Re: Luke's GTP 
    GTX Level Member QUICKSILVER462's Avatar
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    If its not a valve seat leaking compression, (probably is), but you never know, check the #3 intake camshaft lobe and lifter for wear and/or damage.
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  6. #505 Re: Luke's GTP 
    GTP Level Member CHI2000GTP's Avatar
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    I will do the liquid test. Good tip Scotty. Hopefully tonight. We are hosting Thanksgiving this year, so this week is kind of a bust. I got started on the rear exhaust mani last night but had to quit. I wanna see those rear pistons as well.

    My plan is still to take out the engine. I wanna drop it out the bottom, subframe and all. Removing the entire top end should make that easier, and lighter, and don't have lift the car as high, so safer.

    @QUICKSILVER462 - How do I get a look at the camshaft lobes? I can kinda see it under the valley there.

    No one is mentioning head gasket as possible source of leakage. Is head gasket out as a possibility?
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  7. #506 Re: Luke's GTP 
    GTP Level Member CHI2000GTP's Avatar
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    Another detail about the compression test. Of course I tested #3 multiple times after it seemingly failed. First test was 90psi, then 60psi, and then 30psi was final reading.

    Also, to refresh memories, this started with a WOT run on the e-way, car blipped/glitched during WOT run, check engine light flashing, reader showing misfire on 4, possible fried plug wires. Two days later I drove (30min roundtrip) with misfire and that's when shyt went downhill fast. While driving back home, engine started running like death. Burning smell in cabin. Stalled out when pulling into parking spot. Next day changed wires, no start, no start, no start, then started with lots of gas pedal action, but RPMs wheezing like a serious vacuum leak. And then compression test, and here we are with heads off.

    Misfire on 4, but compression failure on 3? Huh?
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  8. #507 Re: Luke's GTP 
    GTX Level Member QUICKSILVER462's Avatar
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    If your intake valve seat was letting compression leak by, that would through a whole lotta things out of whack, especially intake manifold vacuum, the map sensor reading would be crazy, then so would the a/f mixture, this is probably why the exhaust valves are not white in color, in theory that is. I would take out #3 valve and look at the seats and valve before doing anything else, unless your heart is set on dropping the engine.
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  9. #508 Re: Luke's GTP 
    GTP Level Member CHI2000GTP's Avatar
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    I will be taking a look at the seats, for sure. Valves need the guide seals replaced. Probably clean and polish them as well. I'm pretty set on dropping the engine so I can completely re-gasket the entire thing. Oil pan is leaking something fierce. It will also give me a chance to clean up the engine bay and take a look at the pesky power steering pump which looks to be leaking again.
    2000 GTP 4DR - Stock
    243,000 miles
    CHICAGO, IL
    My Car: http://www.grandprixforums.com/members-rides/103740-lukes-gtp.html#post1443981
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  10. #509 Re: Luke's GTP 
    GrandPrix Junkie ItHurtz's Avatar
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    Your head gasket looks fine, valve guides thats a machine shop deal, valve seals themselves is easy with a socket and a small hammer.
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  11. #510 Re: Luke's GTP 
    GTP Level Member CHI2000GTP's Avatar
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    Haven't posted in a while, but the Grand Prix junkie in me is alive and well! For the GTP, I did the liquid leak test on the front head and the results are confusing. Cylinder 1 valves leaked the most, and cylinder 3 valves the least. BUT it was Cylinder 3 had the low compression @ 55 psi (tested three times that night). I don't know. I have been working on tearing the engine down to the minimum so it will be easier to drop out the bottom. Or maybe out the top? Still trying to visualize it all. I've been skimming eBay and craigslist looking for a L67, or a whole Park Avenue Ultra for cheap and remove engine/trans from that. I want this car up and running by end of March.


    The blue Turbo GP, the GTPT, has been getting some drive time. Just a few weeks ago, I drove it the longest its probably ever been driven, to Kalamazoo and back. She's a screamer. She also doesn't like the cold; more than any car I've ever owned. Just now, just recently, I started having some issues with the car surging and I can't pin-point the issue. Maybe a separate thread on that? But basically I let off the gas, RPMs don't drop like they should, they stay locked at15oo or higher, and continue to climb ever so slightly with no foot on gas. The car accelerating slightly to its own. I checked the cable, the gas pedal, the floor mat, the throttle body, and replaced the TPS with the one from the GTP. Vacuum lines are new and silicone and good for the next 20 years. Ohh, another clue! When it's self accelerating like that, and I pop it into neutral, RPMs scream to 2500+ and stay there, then continue climbing, ever so slightly.

    And, Happy New Year yall! Wishing you all health, fortune, no coolant leaks, and forever working transmissions.




    To remind everyone, the low compression reading on Cylinder 3:





    Liquid leak test results. Front head:













    After 1 hour:





    After 24hrs:









    Disassembly of GTP engine continues. How it looks as of right now:










    ASS to ASS:


    2000 GTP 4DR - Stock
    243,000 miles
    CHICAGO, IL
    My Car: http://www.grandprixforums.com/members-rides/103740-lukes-gtp.html#post1443981
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  12. #511 Re: Luke's GTP 
    GTX Level Member cheatah faheatah's Avatar
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    Always good to hear from you. Keep the updates coming as time allows you.
    For the record : I am NOT a naked meth-head who shoves rocks up my butt.
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  14. #512 Re: Luke's GTP 
    GTP Level Member CHI2000GTP's Avatar
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    Quote Originally Posted by cheatah faheatah View Post
    Always good to hear from you. Keep the updates coming as time allows you.
    Thanks cheatah! Will do.
    2000 GTP 4DR - Stock
    243,000 miles
    CHICAGO, IL
    My Car: http://www.grandprixforums.com/members-rides/103740-lukes-gtp.html#post1443981
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  15. #513 Re: Luke's GTP 
    GrandPrix Junkie ItHurtz's Avatar
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    She needs bullitts re installed........ hint hint!

    I keep thinking about this..... IAC? I really have no clue wtf would make a drive by cable car accelerate without manual input
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  16. #514 Re: Luke's GTP 
    GrandPrix Junkie SgtMarshal's Avatar
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    time to do an egr delete
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  17. #515 Re: Luke's GTP 
    GrandPrix Junkie ItHurtz's Avatar
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    He has 2 gp's, you need to be vehicle specific
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  18. #516 Re: Luke's GTP 
    GrandPrix Junkie SgtMarshal's Avatar
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    no need, apparently both still have the egr.
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  19. #517 Re: Luke's GTP 
    GrandPrix Junkie ItHurtz's Avatar
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    your delusional by far
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  20. #518 Re: Luke's GTP 
    GrandPrix Junkie SgtMarshal's Avatar
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    really
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  21. #519 Re: Luke's GTP 
    GTP Level Member CHI2000GTP's Avatar
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    The GTP has or had, EGR.

    Turbo GTPT has no EGR.

    Settled.
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  22. #520 Re: Luke's GTP 
    GrandPrix Junkie ItHurtz's Avatar
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    Swap the IAC from the red car see if that fixes it.
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