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Discussion Starter · #1 ·
05 lly, 174k miles, k&n cold air intake, diablo predator, and just put in the ppe fprv shim (which fixed my previous problem). But now, If I'm stopped at a red light and I turn the radio down, I can hear it idling weird. It'll go upppp, then lowwwww, upppppp, then lowwwwww, and so. like it isn't a constant hum. Its more of an up and down kind of thing. any ideas?
 

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sounds kind of like a fpr (fuel pressure regulator) going out to me
 

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Discussion Starter · #10 ·
ttt

Is this 100% the fpr, or are there so other ideas I could check out first?

Because the truck accelerates and black smokes and does everything fine, but when it idles it just idles high...then low..high...then low
 

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Does it "surge" and not very noticeable on TAC or EGT? Thats what mine did. A new FPR fixed mine.
 

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X2 on that^^^^^^ Mine does the exact same thing.. I put 2 stroke oil and it kinda smooth's it out but not compleatly...
What was the mixture ratio you used for 2cycle to Diesel?:gearjamin
 
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