[durasquattin05]

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?

 

[Davis Dresser]

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

 

[Jaylaniuk]

X2 on that^^^^^^ Mine does the exact same thing.. I put 2 stroke oil and it kinda smooth's it out but not compleatly...

 

[durasquattin05]

so how much will one of those cost me? And where is the best place to get one?

 

[Davis Dresser]

if you buy it from a dealer they are $425 not installed i think it is about $800 for a dealer to put it in. this website wants $233 for them Oregon Fuel Injection, Chevy diesel performance products, diesel fuel injection repair parts for Duramax 6.6 L, 6.2 L and 6.5 L engines. its an all day project thow

 

[Jaylaniuk]

Im still runing with mine..... Maby I should fix it pretty soon......

 

[Killerbee]

Log it first. There are other reasons this happens. If your desired and actual pressure are in disparity, then replace it.

 

[durasquattin05]

Log it first. There are other reasons this happens. If your desired and actual pressure are in disparity, then replace it.

I'm not very mechanically inclined. What do you mean by "log it"?

 

[dw2500]

FPR, dont get ripped off by the dealer

 

[durasquattin05]

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

 

[durasquattin05]

a slow pulsing would be a good way to describe it

 

[kwbaum829]

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

 

[Buddaorf]

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

 

[durasquattin05]

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

Alright thanks. Did you do it yourself, or take it to a dealer?

 

[saskboy]

My LLY used to do that too, I switched my additive to cheap walmart outboad oil instead. Its gone now. 200:1 ratio.