Thread: Cylinder #5 misfire

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  1. #1 Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    Really stumped on this one. I've checked the plug & it checked out fine. As does all the wiring. What could be causing this?
    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. #2 Re: Cylinder #5 misfire 
    The Blue One blueguy's Avatar
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    Have you replaced the plug, coil, plug wire? Or just "looked" at them?
    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
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  3. #3 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    I checked for fluid & corrosion on the plug as well as cracks. The spark plug was clean & undamaged. As was the plug wire.
    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. #4 Re: Cylinder #5 misfire 
    The Blue One blueguy's Avatar
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    I'm saying I've had plugs and wires that looked fine but are bad...swap the coil and injector and see if the missfire follows...
    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. #5 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    I will do that.
    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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  6. #6 Re: Cylinder #5 misfire 
    GT Level Member aligater's Avatar
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    move one part at a time to know which one is failing, I'd try the injector last. Also if your using your aeroforce as the scanner, check with an actual scanner as I have had one lie, saying cyl 1 missfire only to find out it was #2 cyl. Try plug, wire, coil etc. and see if the miss follows the part you've swapped out.

    GL
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  7. #7 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    I'd love to swap one part at a time, but I no longer have my own 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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  8. #8 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    New plug and plug wire. Still misfiring. That leaves, coil, injector, PCM, or something else. I'm tired of this car.
    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. #9 Re: Cylinder #5 misfire 
    Moderator dsmuts's Avatar
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    Is it C.O.P.? Move the injector to one cyl and the coil to another and see if it moves.
    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: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    What is C.O.P?
    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. #11 Re: Cylinder #5 misfire 
    Moderator dsmuts's Avatar
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    coil over plug
    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: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    Yes
    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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  13. #13 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    On a brighter note. the guy who scanned my car said this is putting too much load on the engine and that the tranny wouldn't last much longer.
    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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  14. #14 Re: Cylinder #5 misfire 
    Moderator dsmuts's Avatar
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    Swap the coil. My bet is the coil is shot.
    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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  15. #15 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    I did get a crazy unusual improvement in mpg after putting a new plug and wire on cylinder #5. Went from 18.5 to 25.3
    Last edited by SDGTP99; 01-23-2013 at 08:10 PM. Reason: Making typos cuz Im im a bad mood.
    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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  16. #16 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    Is aisfire really going to make my tranny temps go up? Temps are reaching up to @221.
    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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  17. #17 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    New coil didn't help.
    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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  18. #18 Re: Cylinder #5 misfire 
    Moderator dsmuts's Avatar
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    Trans temp shouldn't matter even if it's misfiring. Try moving the injector next? DOD messed up maybe?
    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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  19. #19 Re: Cylinder #5 misfire 
    GrandPrix Junkie SDGTP99's Avatar
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    Idk, maybe. I'm calling the dealership in the morning. GXP's under warranty so they can fix it. Cuz I've had enough of this cars shenanigans.
    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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  20. #20 Re: Cylinder #5 misfire 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Last thing would be the injector, or reduce the plug gap some, even do a compression test.

    SMGPFC Member #1
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