Thread: car misfires

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  1. #1 car misfires 
    GT Level Member backinblackgtp's Avatar
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    after dropping to a 3.5 pulley with a tune i have been having the same issue with my car, it hesitates and misfires under boost, it happens just on cyl 6 so i thought it was the EGR so i did the EGR blockoff since it dumped into cyl 6. but its still happening, what should i check next. i have also checked the coil packs, plugs and wires.
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  2. #2 Re: car misfires 
    I live here. Slick2500's Avatar
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    KR and timing.
    Did you get an actual tune or a pcm from somewhere?
    You running a 180* tstat and colder plugs?
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  3. #3 Re: car misfires 
    GT Level Member backinblackgtp's Avatar
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    actual tune made 235 whp weather corrected 250 wtq (weather corrected) had him come with me i boosted, and the scanner said no knock, but was showing misfires, anyway from 6 to 60 at some times. and it was weird because at some points it hit 13 lbs of boost, which is 3 lbs over what the tune said it made.... and yeah im running 180 t stat and tr6s
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  4. #4 Re: car misfires 
    GTP Level Member KeithGTP03's Avatar
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    Im gettin almost the same thing...Cylinder 5 and 6 misfires at idle only though. The 6 is at about 40 at idle and slight throttle. But moderate throttle and above I have 0 misfires

    03 GTP...Its got pulleys and stuff.
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  5. #5 Re: car misfires 
    GT Level Member backinblackgtp's Avatar
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    that could be injectors maybe.
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  6. #6 Re: car misfires 
    GT Level Member taman86's Avatar
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    about 40 at idle and slight throttle
    anyway from 6 to 60 at some times
    what are the numbers you're talking about, number of missfires? how would you check that, with a scanner?
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  7. #7 Re: car misfires 
    GTP Level Member KeithGTP03's Avatar
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    They are the number of misfires in a cylinder per minute. I have an aeroforce scan gauge so I can keep an eye on each cylinder. My cylinder 6 misfire is gone after replacing the blown out plug.

    03 GTP...Its got pulleys and stuff.
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