Thread: Misfire #6

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  1. #1 Misfire #6 
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    Have a Misfire code and the Fuel Inject code on my 1999 Grand Prix (3.8).. I replaced the injector, did a full tune up, wires, plugs, fuel injecting cleaning, and even a tranny filter and gasket change. After a day or so, it started to run rough and threw the same codes..... I was reading that sometimes it can be a ground issue.... I can say that the main ground going from the batter to the car was poor.... it was grounded to a painted surface.... I corrected that ... Now my Low Coolant light came on.... well kinda off and on... now on all the time.... I replaced that module in March..... plenty of coolant and levels are good.... its acting like a ground... can anyone tell me where the main harness ground for the Low coolant module is?????
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  2. #2 Re: Misfire #6 
    Moderator dsmuts's Avatar
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    coolant sensor gets gunked up and its pretty easy to just unhook it.
    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. #3 Re: Misfire #6 
    Turbo is the way to go. BillBoost37's Avatar
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    Why wouldn't your battery ground be on the correct stud at the transmission? Maybe move it back where it belongs with the other two grounds and see if that helps.

    On that injector...what is the code?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  4. #4 Re: Misfire #6 
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    I didn't move the ground.... I just unscrwed the cable and cleaned it up. Ill see if I can get a pic.... It terms of the coolant light... I will remove/clean/replace, but it really acts like an electrical problem... Light doesn't stay on... it fades in and out... very strange.... Thanks for the suggestions... The code was PO206---- the other code was a 300 code..... Misfire on #6... same as my fuel injector
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  5. #5 Re: Misfire #6 
    Moderator dsmuts's Avatar
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    p0300 is a random misfire code not a cyl 6 misfire code.
    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: Misfire #6 
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    The scanner I have identfies the cyl. It was confirmed byt dealer
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  7. #7  
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    Test resistance across the injector. Should be around 15 ohms.
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  8. #8  
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    Quote Originally Posted by rnpiii View Post
    The scanner I have identfies the cyl. It was confirmed byt dealer
    P0306 is cyl 6 misfire.
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  9. #9 Re: Misfire #6 
    GTP Level Member 1ATony's Avatar
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    Welcome to the site

    Tony
    1aauto.com
    SALES 888-844-3393
    Shop Here For: Grand Prix Parts
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  10. #10 Re: Misfire #6 
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    Y’all are correct PO306 and I test the injector... was week... cleaned the connector and put a small amount of electrical grease... then test correctly.... did that this am... dove 20 miles and so far so good........
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  11. #11 Re: Misfire #6 
    GT Level Member rmcardle3's Avatar
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    Any further trouble since your last post? All good?
    2000 GRAND PRIX GTP (Sedan)
    MICHELIN Pilot® Sport A/S Plus 245/50 ZR16 97W M+S
    Cone Intake, SD Headers
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  12. #12 Re: Misfire #6 
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    Everything working fine. Since the rewiring, the motor runs as it should & has not produced a code.
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