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5.3 breaking up really bad.

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Old Feb 1, 2009 | 06:28 PM
  #11  
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get a screwdriver and see which coil is bad by making the spark jump from screwdriver to block, i think its one of ur coils especally if there is no check engine light
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Old Feb 1, 2009 | 08:25 PM
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Originally Posted by bohr898
get a screwdriver and see which coil is bad by making the spark jump from screwdriver to block, i think its one of ur coils especally if there is no check engine light
I was gonna take a spark plug and rest it on some metal and see if each coil was firing the next time I have a chance to look at it.
Thanks for the help.
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Old Feb 2, 2009 | 01:25 AM
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Test your backpressures, you have a cat plugging up. Seen this before.
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Old Feb 2, 2009 | 01:41 AM
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Originally Posted by AKlowriderZ71
Test your backpressures, you have a cat plugging up. Seen this before.
His sig says ORY
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Old Feb 2, 2009 | 03:38 AM
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+1 for the Throttle body.
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Old Feb 2, 2009 | 06:32 AM
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Originally Posted by AKlowriderZ71
Test your backpressures, you have a cat plugging up. Seen this before.
I dont have cats anymore.
Thanks for the suggestion.
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Old Feb 2, 2009 | 07:29 AM
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pcm could be bad. I got a bad pcm once and the speedo was acting like a tach at idle and doing all kinds of crazy things!
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Old Feb 2, 2009 | 07:36 AM
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Originally Posted by GREENSIERRA
I dont have cats anymore.
Thanks for the suggestion.
well maybe thats the problem i took off my cats and my truck is runing a little wierd it died on me 2 times alredy
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Old Feb 2, 2009 | 01:15 PM
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Originally Posted by GMCtrk
pcm could be bad. I got a bad pcm once and the speedo was acting like a tach at idle and doing all kinds of crazy things!
I have EFI live and have been using it for almost a year with zero problems.
If I can't figure out what's wrong I am gonna take it to my Buddy that did my efi live and see if he can figure it out.
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Old Feb 2, 2009 | 01:18 PM
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Originally Posted by Michael Halo
well maybe thats the problem i took off my cats and my truck is runing a little wierd it died on me 2 times alredy
I have been catless for over a month now and it ran perfect till this problem so I don't think it has anything to do with taking out the cats. I had the 2 rear O2s turned off aswell.
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