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Need help big time!

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Old Sep 29, 2012 | 12:07 PM
  #11  
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Bad cat is my guess. Do a backpressure test on both banks.
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Old Sep 30, 2012 | 03:40 PM
  #12  
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yeah i was thinking plugged exhaust as well
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Old Oct 1, 2012 | 10:25 PM
  #13  
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Okay check the exhaust with a back pressure gauge everything checks out good, did a fuel pressure test all god there also..completely stumped! Cleaned throttle body and mass air flow sensor again and still there
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Old Oct 2, 2012 | 11:43 AM
  #14  
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Did you check fuel pressure under WOT? It's possible that the fuel pressure is fine at an idle, but under a load it will fall. You how many miles on your rig? Still running the original plugs and wires?
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Old Oct 2, 2012 | 12:19 PM
  #15  
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Originally Posted by PowellSixO
Did you check fuel pressure under WOT? It's possible that the fuel pressure is fine at an idle, but under a load it will fall. You how many miles on your rig? Still running the original plugs and wires?
yup, check the pressure at WOT, tape the gauge to the windshield and have someone ride with you to check it.
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Old Oct 2, 2012 | 04:18 PM
  #16  
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Okay I'll try that, and the truck only has 27000
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Old Oct 2, 2012 | 04:19 PM
  #17  
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And yes still original plugs and wires, the truck was owned by an older gentlemen who only used it to pull his 5th wheel and besides that it just sat
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Old Oct 2, 2012 | 06:52 PM
  #18  
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still under warranty?? take it to a dealer
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Old Oct 4, 2012 | 10:34 PM
  #19  
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sounds to me like the torque converter locking at wot. wich i believe it does in the stock tune.
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Old Oct 5, 2012 | 12:16 AM
  #20  
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Originally Posted by indigoblue
sounds to me like the torque converter locking at wot. wich i believe it does in the stock tune.
That's what I was thinking reading this thread. Since it seemed to do it at exactly the same spots in the power band and not in 1st gear...
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