Fuel Pressure Oscillation

WetMtnCRD

New member
Joined
Oct 1, 2012
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13
Have been do some tuning with EFI and have developed a fuel pressure oscillation. Not at cruise like I read in another thread but at moderate acceleration and under load when towing. Duty cycle oscillates as well. But that may just be the ecm trying to regulate the oscillation or it may be the root cause. I'm not sure. I've replaced the FCA and shimmed the FPRV. Anyone have any experience with this?
 
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