Changed Fuel PRV Engine still has minor surging - Chevy and GMC Duramax Diesel Forum
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Old 12-01-2012, 07:01 PM   eBay Motors  #1 (permalink)
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Changed Fuel PRV Engine still has minor surging

Changed FPR on cp3 this afternoon engine idle in gear is much smoother now but every now and then idle still drops then picks back up when I let off the brake @735 rpm norm idle is around 680 any thoughts or ideas? Thanks surge is between 635 to 735.

Last edited by IA DMAX; 12-01-2012 at 08:41 PM.
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Old 12-01-2012, 07:11 PM   eBay Motors  #2 (permalink)
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I thought Fprv was on the fuel rail not on the cp3.
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Old 12-01-2012, 07:14 PM   eBay Motors  #3 (permalink)
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Its the solenoid that regulates fuel pressure three t-25 screws hold it on the CP3
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Old 12-01-2012, 07:30 PM   eBay Motors  #4 (permalink)
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Isnt that the regulator?

The one on the rail is pressure relief. I think they are two different things.
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Old 12-01-2012, 07:50 PM   eBay Motors  #5 (permalink)
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Yes it's the regulator FPR on the CP3 fuel pump
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Old 12-02-2012, 03:20 AM   eBay Motors  #6 (permalink)
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Bump ^^
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Old 12-02-2012, 05:47 AM   eBay Motors  #7 (permalink)
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Quote:
Originally Posted by DMaxxrus View Post
Isnt that the regulator?

The one on the rail is pressure relief. I think they are two different things.

Yes, they are....

FPR = Fuel Pressure Regulator (on CP3)

FPRV = Fuel Pressure Relief Valve (on fuel rail)


OP, please fill out your sig so we know what truck you have and any mods.

That being said if it's an LLY try ice picking your injectors and reinsulating the FICM harness at the alternator bracket.
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Old 12-03-2012, 04:20 PM   eBay Motors  #8 (permalink)
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Updated sig
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Old 12-03-2012, 04:22 PM   eBay Motors  #9 (permalink)
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Also transmission rebuildt and 3 disc billet torque converter installed
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Old 12-03-2012, 05:13 PM   eBay Motors  #10 (permalink)
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what is ice picking your inj mean
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