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1994.5 - 1997 7.3L Power Stroke Diesel  

OP problem

   
Old Aug 1, 2011 | 08:34 AM
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OP problem
it seems after runnung down the X-way for about 10 mines whenI get off the ramp for the light my Op drops off to 12 and slowley comes back to 20 ( where it normanly runs hot @ idle)AND THE RPM DROPS TO 500 AND THEN BACK UP WHAT WOULD CAUSE THIS?? could a sticking <ACRONYM title="Injection Pressure Regulator">IPR</ACRONYM> do it or do i need to start looking for a motor or new truck?@ 2000 rpm hot the op is still @ 38 like always.
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Old Aug 4, 2011 | 01:56 PM
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anyone????
 
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Old Aug 4, 2011 | 04:03 PM
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All I can say is when the op drops low with the rpms that would be normal, although I don't know where these trucks should run normally. I don't have a gauge to check. I'm also no help what could be causing this.

So, in other words, I'm not much help at all, but here is another bump..
 
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Old Aug 4, 2011 | 08:34 PM
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You might just need to replace the LPOP. If so most go with the Melling. If that ends up being the issue.
 
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Old Aug 4, 2011 | 09:47 PM
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Mine will drop to 20psi hot at idle but my idle is at 700. The dropping to 500 could be the IPR O rings, cheap to check and cheaper then a new motor.
 
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Old Aug 5, 2011 | 09:01 AM
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thanks i have another ipr i can swap out when i get a chance.
 
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Old Aug 17, 2011 | 08:26 AM
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changed the IPR no change, what would cause idel to drop?
 
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Old Aug 17, 2011 | 09:26 AM
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Fuel pressure. They will do weird things like stumble and sputter but some times still run.
 
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