Thread: Need help reassembling 1999 grand prix

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  1. #21 Re: Need help reassembling 1999 grand prix 
    Moderator dsmuts's Avatar
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    You have a vacuum leak. You only change the upper intake gasket which almost never fails.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  2. #22 Re: Need help reassembling 1999 grand prix 
    Moderator dsmuts's Avatar
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    Why did you pull the spark plug wires off anyway?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #23 Re: Need help reassembling 1999 grand prix 
    GTP Level Member KeithGTP03's Avatar
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    What about the vac lines? Any of them get cracked while removing them? Spray some throttle body cleaner around the vac lines and the UIM while its running, and see if the motor revs higher. Also, try unplugging the MAF and see if it stays running.

    03 GTP...Its got pulleys and stuff.
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  4. #24 Re: Need help reassembling 1999 grand prix 
    GTP Level Member KeithGTP03's Avatar
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    Not really familiar with the 3100, but this should be the vacuum diagram


    03 GTP...Its got pulleys and stuff.
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  5. #25 Re: Need help reassembling 1999 grand prix 
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    Ok, we will check that again, just took off two spark plugs because they were in our way, but we marked both of them
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  6. #26 Re: Need help reassembling 1999 grand prix 
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    Thank you so much for the pics and diagram! You have been very helpful
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