Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

New here, old problem

Old Jul 28, 2010 | 03:34 PM
  #1  
Livelli's Avatar
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Diesel Fan
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Default New here, old problem

My '85 6.2l starts right up, runs smooth, but gets choppy once it warms up and the HPCA disengages. I've messed with timing the pump, but that has gotten me nowhere. Youtube to follow...


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Some people tell me it's compression, some say a bad IP, some say injectors, and some say timing. I've seen a bunch of people posting the same or similar problems all over the web, but can't find any resolved.
 

Last edited by Livelli; Jul 28, 2010 at 03:34 PM. Reason: Automerged Doublepost
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Old Jul 28, 2010 | 05:03 PM
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From: Wadesville IN
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If you have a good fuel filter I am going to lay my money on injector pump.
 
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Old Jul 29, 2010 | 08:42 AM
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New filter and every piece of rubber has been replaced. It's $125 to test the IP at the local diesel shop. What about fuel pressure? Would too much/not enough pressure do this?

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New lift pump too. The IP only has about 2-4k miles on it, although it has been sitting for four years not running.
 

Last edited by Livelli; Jul 29, 2010 at 08:42 AM. Reason: Automerged Doublepost
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Old Aug 25, 2010 | 05:59 AM
  #4  
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changed out the IP with a used 4911 from a 6.5TD, runs like a champ
 
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