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6.5L runaway when idling

  #1  
Old 03-30-2018, 01:56 PM
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Default 6.5L runaway when idling

Hi,
I'm looking for advice on a 1999 6.5L. Here's the symptoms:

With the first PMD, the engine would idle normally but if I tapped the accelerator the RPMs would spike up.
With a second PMD, the engine would idle normally for 10-20 seconds but then RPMs would spike up without me touching the accelerator.

I get a scanner code P1653

Could both PMDs be faulty? I did the LiftPump test, fuel comes out the T-vavle hose. The previous owner replaced the IP several years ago but I don't know the quality of the current pump.

Any assistance appreciated. Thanks
 
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Old 09-26-2018, 09:28 AM
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The new PMD seems to have settled down now.
This thread can be closed. Thanks.
 

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