Thread: knock & P0172

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  1. #41 Re: knock & P0172 
    GrandPrix Junkie SDGTP99's Avatar
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    I suppose they could be. Im not getting missfires though.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  2. #42 Re: knock & P0172 
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    You said 2 misfires at idle when you scanned.. What are you scanning with?

    Wizaired CAI, ZZP Headers & DP, SLP cat-back, 1.8 RRs
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  3. #43 Re: knock & P0172 
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    Aeroforce scangauge.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  4. #44 Re: knock & P0172 
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    Ok, on your trip to mcds when your engine started surging did you get any misfires?

    Wizaired CAI, ZZP Headers & DP, SLP cat-back, 1.8 RRs
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  5. #45 Re: knock & P0172 
    Moderator dsmuts's Avatar
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    Check fuse 21 under hood
    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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  6. #46 Re: knock & P0172 
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    When my car started surging the scangauge was showing knock and HP so I didnt see if I got any missfires. Fuse 21?
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  7. #47 Re: knock & P0172 
    Moderator dsmuts's Avatar
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    i was thinking of something else sorry.
    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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  8. #48 Re: knock & P0172 
    GrandPrix Junkie SDGTP99's Avatar
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    Whats should the MAF read at idle?
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  9. #49 Re: knock & P0172 
    GrandPrix Junkie SDGTP99's Avatar
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    No fuel in the vacuum line at the fpr.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  10. #50 Re: knock & P0172 
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    Well as of the new IAC sensor heres what I got(all at idle):

    IAC 2026
    RPM 789-800
    CMD A/F 14.70
    MAP PSI -21.2
    IAT 159
    MAP kPa 26
    Coolant 188
    Boost -21.2
    MAF freq 2947
    Throttle V .49
    Ignition adv 22.0
    Short Tr -14.8
    Long Tr -22.6
    02 S1B2 985
    02 S1B1 985
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  11. #51 Re: knock & P0172 
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    Adjusted (lowered) the FPR to 40psi @ idle. It's been a week now & no more gasoline smell or code P0172. Problem solved.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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