06 chevy 2500hd running bad 6.0L

RichieC58

06 chevy 2500hd running bad 6.0L

Unread post by RichieC58 » Wed Aug 25, 2010 2:47 pm

at different times it will start missing. At idle,1500 rpm whenever. When watching scanner it is missing on all cyl.like a bad circuit in the ecm. Sometimes it will run great. When it kills it starts right back up missing. When it acts up I have good fuel pressure. It does not fluxuate. Have changed plugs and wires and crank sensor. I have tried wiggle test and tapping everything and nothing changes. There are no codes. Have checked all the grounds. Even the one on the head.

17fred9

Re: 06 chevy 2500hd running bad 6.0L

Unread post by 17fred9 » Wed Aug 25, 2010 11:55 pm

With no codes to go by, it would be hard to say.
Misfire on all cylinders does not sound like an ECM.
Take a fuel sample.
Have the throttle bore and plate cleaned of carbon.
I assume that you mean as it is dying the fuel pressure is fine.

RichieC58

Re: 06 chevy 2500hd running bad 6.0L

Unread post by RichieC58 » Thu Aug 26, 2010 6:26 am

Throttle plates are clean fuel is clean. Acts like it is loosing spark or power to injectors. While it is missing the fuel pressure does not drop stays at 60-62lbs

17Fred9

Re: 06 chevy 2500hd running bad 6.0L

Unread post by 17Fred9 » Thu Aug 26, 2010 6:56 pm

HMMM. That is wierd. You would need to confirm exactly what is causing the misfire- like you said either spark or injector pulsing. Maybe you are loosing spark or pulse to one bank.

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