cylinder 1 misfire detected (fixed) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-24-2010, 02:48 AM   #11
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Quote:
Originally Posted by bonnySSEiowner View Post
it hardly takes any pressure on the pedal to make it jump up past 0 to right around 5psi. what would cause this?
A vacuum leak. What does the vac/boost gauge read at idle? What does it read during deceleration? If the gauge isn't getting almost pegged to the left, you have a vacuum leak.

When you removed the fuel rail, you removed the vacuum tee from the fuel pressure regulator. I have had that tee crack on me a few times. Re-check all vacuum lines.

greg b.
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Old 01-27-2011, 07:04 PM   #12
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Well, I still haven't figured out my problem. i finally took it to the shop and they're trying to tell me its a plugged act. but for some reason i have my doubts about that. I mean' would that affect my boost? what code would that give? they want more than a thousand bucks to change this. I think that is excessive even if it the problem. HELP!
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Old 01-27-2011, 07:05 PM   #13
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act was supposed to be cat. seems i cant edit :(
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Old 01-27-2011, 07:07 PM   #14
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A clogged cat will cause problems like a misfire because the exhaust can't get out. A grand to change a cat is robbery. A new cat is about $70, and perhaps $100 to have a muffler shop weld it in.
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Old 01-27-2011, 07:57 PM   #15
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Thanks Danthurs, now, i was looking thru some old posts and there seems to be a cat that supposedly will fit w/o throwing any codes, goerlich or something like. would that be the one that i should use? This forum is the best thing since sliced bread, lol thankx
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Old 01-27-2011, 08:06 PM   #16
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Yes, that'* the one. Sawgunner should have a URL for that one
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Old 01-27-2011, 08:20 PM   #17
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How old/how many miles. Poor running beyond an idle and "instant boost pressure" makes me think clogged cat.
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Old 02-11-2011, 10:22 PM   #18
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Sorry to leave you guys hanging. Well, it turns out it was a plugged cat. thanks to all who replied.
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Old 02-11-2011, 10:29 PM   #19
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Good to hear, hope it didn't cost you to much.
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