grand am hates me take 2 MISFIRE! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-24-2011, 06:03 PM   #11
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Originally Posted by jwfirebird View Post
i would swap the coils around and see if the problem moves, and check the little tabs, they get corroded sometimes. for me single cylinder misfire is more often ign. problems rather than fuel related.
He described it as random misfire.
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Old 08-24-2011, 06:35 PM   #12
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I'm really starting to think it'* these plugs

I will get a set of ac plats once I have a job and try that
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Old 08-25-2011, 07:44 AM   #13
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misread, thought the title said cyl 2 misfire. sorry
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Old 08-25-2011, 07:48 AM   #14
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Lol no problem your not the only one this title confused
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Old 09-20-2011, 11:05 PM   #15
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okay so got a job now and this is getting taken care of as its pissing me off im going to go buy a fuel pressure tester. as i have a suspicion that the fuel pump it dieing (still the cheap champion plugs need to go) the guage is wack as hell im talking going only 60 miles on the first half then 140 on the second half then the next tank 100 and 100. also the car us only getting about 21 mpg strait highway if that.

so would a dieing fuel pump make since for a misfire? as today it was bad it acts like its on 5 cyl but if i rev it to 1k it runs perfect
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Old 09-20-2011, 11:14 PM   #16
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also another reason i suspect the pump is the misfire is worse when im low on gas less than 1/3
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Old 09-21-2011, 07:39 AM   #17
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fuel pumps start to give up these days and the pressure starts going away and then the injectors dont have enough fuel causing the misfire. since youve already done reg im leaning toward the pump or the copper plugs. i tried to put those in my old 3100 GP and it ran worse than the old plat. plugs i had in it
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