Thread: P0171 help please

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  1. #21 Re: P0171 help please 
    Moderator dsmuts's Avatar
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    Vacuum should be a lot closer to 20 you have a vacuum leak somewhere
    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: P0171 help please 
    GT Level Member Erik Adam Rodriguez's Avatar
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    i can hear a hiss coming from the brake booster area tried carb cleaner and no rise in rpm if i block the hose and moniter my fuel trims should i see a change if that is where the leak is coming from?
    02 grand prix gt- L67 swap, ZZP 1.0 pcm, thrasher CAI, SLP 2.5 catback, A/C delete, 02 emulator, poly dog bone mounts, 6000k projectors with CCFL halos, 12 in slotted front rotors, ported blower and intake, evap and EGR deleted, 12" kicker cvr with 1000 watt amp, alpine cda 9886 deck
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  3. #23 Re: P0171 help please 
    Moderator dsmuts's Avatar
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    The hiss its a vacuum leak. Try pushing in on the vacuum line running to the brake booster
    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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  4. #24 Re: P0171 help please 
    The Blue One blueguy's Avatar
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    Whenever your fuel trims are reading 16.4, that's a vacuum leak.

    Find it and fix it.

    Also, 97-98 TB/MAF have to be year specific.

    So you'll be needing a 99-03 TB/MAF.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  5. #25 Re: P0171 help please 
    GT Level Member Erik Adam Rodriguez's Avatar
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    UPDATE- replaced lim gaskets, installed zzp coupler, ported and polished intake and blower, tested maf( good reading), replaced pcv, cleaned all grounds and battery terminals, ran cam2 for a couple weeks, and plugged acc vacuum port. my question now is can the map sensor be bad cause that is were the hiss is coming from?
    02 grand prix gt- L67 swap, ZZP 1.0 pcm, thrasher CAI, SLP 2.5 catback, A/C delete, 02 emulator, poly dog bone mounts, 6000k projectors with CCFL halos, 12 in slotted front rotors, ported blower and intake, evap and EGR deleted, 12" kicker cvr with 1000 watt amp, alpine cda 9886 deck
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