Thread: What is a normal amount of misfires?

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  1. #1 What is a normal amount of misfires? 
    SE Level Member LouF's Avatar
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    I thought I solved my intermittent random misfires from vacuum leaks, but it really is just masked; they are still subtlety there. Now, they are much less, but I can tell the engine is somewhat groggy at those times. I run a OBD reader while normally driving, and the misfires show there. Some I surely would know about w/o the reader. Is there always a certain amount of misfires, even when it was new? 2005 GP GTP
    2005 Grand Prix GTP
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  2. #2 Re: What is a normal amount of misfires? 
    SE Level Member LouF's Avatar
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    Quote Originally Posted by LouF View Post
    Some I surely would know about w/o the reader.
    Some I surely would NOT know about w/o the reader.


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    2005 Grand Prix GTP
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  3. #3 Re: What is a normal amount of misfires? 
    Killa Bee Scottydoggs's Avatar
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    you should see no miss fires ever, unless you have a cam.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: What is a normal amount of misfires? 
    SE Level Member LouF's Avatar
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    That's what I thought. Thanks
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  5. #5 Re: What is a normal amount of misfires? 
    GrandPrix Junkie ItHurtz's Avatar
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    My aeroforce would show up to 30 misfires just sitting there idling and ran great, pre cam. If it doesnt run great start trouble shooting.
    2000 GTPT Sold-brandonhall10 built trans
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  6. #6 Re: What is a normal amount of misfires? 
    GXP Level Member GTPpower's Avatar
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    Yeah, it's common to see misfires while ideling, but they should clear up with any throttle input.
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  7. #7 Re: What is a normal amount of misfires? 
    Donating Users bandook's Avatar
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    Gonna have to look at my logs again in idle, because I've never seen misfires. But I'm usually only looking at wot. So many wot pulls lately...
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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