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08-05-2007, 09:23 PM
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Hummer Veteran
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Join Date: Sep 2006
Location: Ann Arbor, MI
Posts: 138
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Random/Multiple Cylinder Misfire Detected
well my H2 has just started throwing this code.
when i am at WOT, it does surge or hesatate, the tach does go up and down.
i do have a super charger on it and a borla exhaust.
anyone else have this problem.
oh... i have been trying diffrent brands of gas since this started to see if i was getting some bad gas.
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08-05-2007, 09:39 PM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: Random/Multiple Cylinder Misfire Detected
Likely have A restricted cat converter. Check backpressure of both if either is over 1 psi of backpressure that will cause random missfires on that bank.
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08-06-2007, 05:10 PM
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Hummer Professional
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Join Date: Feb 2003
Location: Palm Desert, CA
Posts: 470
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Re: Random/Multiple Cylinder Misfire Detected
HUMTECH is right (as usual!). I had the same thing happen last week. I got the same code and have been getting a code for a bad passenger side converter too. It happened when going up a steep incline and punching it hard and the check engine light kept blinking on and off. I downloaded (if I remember correctly) code P101. I have a supercharger also.
__________________
2003 H2 Hummer, Yellow,Polished Whipple Supercharged, Dynatech long tube headers, catback,18\" Ambush w/Toyo MT\'s,lots of goodies!
Y2K Corvette Millennium Yellow Convert/Blk/Blk, B&B headers, B&B Tri-Flo\'s, H-Tech MAG,GMS MAF, RM Racing TwinFlow.
1994 Chev Suburban Blown
1970 Trans Am balanced, blueprinted, ceramic headers, etc.
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08-08-2007, 06:09 PM
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Hummer Veteran
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Join Date: Sep 2006
Location: Ann Arbor, MI
Posts: 138
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Re: Random/Multiple Cylinder Misfire Detected
i forgot to mention that i had high flow cats installed. there is allmost nothing in there and cant see how it would make any back pressure but i will check it
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08-08-2007, 09:50 PM
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Hummer Professional
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Join Date: Feb 2003
Location: Palm Desert, CA
Posts: 470
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Re: Random/Multiple Cylinder Misfire Detected
Where in the world did you find hi-flow cats for the H2?
__________________
2003 H2 Hummer, Yellow,Polished Whipple Supercharged, Dynatech long tube headers, catback,18\" Ambush w/Toyo MT\'s,lots of goodies!
Y2K Corvette Millennium Yellow Convert/Blk/Blk, B&B headers, B&B Tri-Flo\'s, H-Tech MAG,GMS MAF, RM Racing TwinFlow.
1994 Chev Suburban Blown
1970 Trans Am balanced, blueprinted, ceramic headers, etc.
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