5.3 breaking up really bad.

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02-01-2009, 06:28 PM

#11

bohr898

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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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02-01-2009, 08:25 PM

#12

GREENSIERRA

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Quote:

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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02-02-2009, 01:25 AM

#13

AKlowriderZ71

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Test your backpressures, you have a cat plugging up. Seen this before.

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02-02-2009, 01:41 AM

#14

viciousknid

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Quote:

Originally Posted by AKlowriderZ71

Test your backpressures, you have a cat plugging up. Seen this before.

His sig says ORY

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02-02-2009, 03:38 AM

#15

LowBlack99

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+1 for the Throttle body.

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02-02-2009, 06:32 AM

#16

GREENSIERRA

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Quote:

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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02-02-2009, 07:29 AM

#17

GMCtrk

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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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02-02-2009, 07:36 AM

#18

Michael Halo

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Quote:

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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02-02-2009, 01:15 PM

#19

GREENSIERRA

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Quote:

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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02-02-2009, 01:18 PM

#20

GREENSIERRA

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Quote:

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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