Thread: False knock??

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  1. #1 False knock?? 
    Moderator dsmuts's Avatar
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    I am getting up to 6* of what i believe to be false knock on my 98 gtp. What all are the causes of it? I put new motor mounts in it as it was shot, poly dogbones, flipped sway, O2 clears. I'm at a loss on what to do next. Thanks for listening.
    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. #2 Re: False knock?? 
    Poppin 'em thangs mechguy's Avatar
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    Might not be false KR, because my car gets 5* KR with similar mods, but no P&P SC, just a 3.5 pulley.
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  3. #3 Re: False knock?? 
    Moderator dsmuts's Avatar
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    It was just getting like 2-3* then i swapped pcm's to a zzp and it got worse then i swapped back and it didn't get any better
    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. #4 Re: False knock?? 
    Poppin 'em thangs mechguy's Avatar
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    Best thing to do is find considerably higher octane gas than you are currently using. Run that for a while, if knock continues it is likely false. If KR is reduced, its not false.
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  5. #5 Re: False knock?? 
    Moderator dsmuts's Avatar
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    i can't get any higher than 93 around here
    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. #6 Re: False knock?? 
    Moderator dsmuts's Avatar
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    well i just took it for a spin after seeing that my trans fill tube was bent (must have happened when i did the motor mount) and now i'm only getting 2-3* on the stock tune. Custom tune here i come
    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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  7. #7 Re: False knock?? 
    GrandPrix Junkie SDGTP99's Avatar
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    Have you checked your plugs or cat?
    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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  8. #8 Re: False knock?? 
    Moderator dsmuts's Avatar
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    no cat, new al104's gapped at .05
    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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  9. #9 Re: False knock?? 
    Moderator dsmuts's Avatar
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    I figured out my problem. I put my tb screen back in and no more kr
    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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  10. #10 Re: False knock?? 
    Turbo is the way to go. BillBoost37's Avatar
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    Then...it wasn't very false.

    Your maf readings were skewed because of the airflow not being read properly. Probably dropped you into super lean conditions that you "should" have seen in the o2's.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  11. #11 Re: False knock?? 
    Moderator dsmuts's Avatar
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    O2 i only have one lol My knock came back after work so i'm thinking my car likes the cooler air better lol. My ft are better now though.
    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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  12. #12 Re: False knock?? 
    Turbo is the way to go. BillBoost37's Avatar
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    I know you only have one that reads. The readings are referred to as O2's, meaning the various readings from the sensor.

    As for your LTFT's, you can't rely on 5 minutes of the screen being in for them to level out.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  13. #13 Re: False knock?? 
    Moderator dsmuts's Avatar
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    My knock is still there but my ft is at 1.6 at WOT so that's not to bad right?
    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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  14. #14 Re: False knock?? 
    The Blue One blueguy's Avatar
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    So it is adding or subtracting 1.6 at WOT?
    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
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  15. #15 Re: False knock?? 
    Moderator dsmuts's Avatar
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    Adding. But now i put my stock pcm back in and i'm getting .5* of KR at the most and my ft are +9.2 I'm not sure what to think on that one.
    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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