Diagnosing

[Jdiperrio]

Hi guys, I've spent the past couple days doing some searching on the site and I think my problem is the FPR but want to make sure before I buy one and end up needing a cp3 instead or something just stupid. So I just bought this 2004 lb7 with 193k on it and completely stock. It is throwing a couple codes P1093 and P1094. I'll attach pictures of pressures I got. The truck starts fine and seems to idle good in park but when in drive it runs like crap till you give it a little throttle but it's a dog and is in the fuel limp mode. Also twice when I was letting off the throttle to stop it stalled on me but would start right back up no problem. What do you guys think? Just dont want to spend money throwing the wrong parts at it.

John

 

[fl0w3n]

By no means an expert like some of the others on here, but can just share my one experience with my bad FPR on my LB7.


It idled like crap, super rough and knocky/lopey. At RPM or driving it smoothed out.



So, just by that, I'd be inclined to say it's not the FPR.

 

[THEFERMANATOR]

Imho, don't waste your money putting a regulator into a cp3 with more than 150k miles. You'll end up like myself and many others where you fix the fluctuating rail pressure, but can't hold rail under load. I was warned and spent the $200 for one anyways just to end up shortly there after spending $650 for a cp3 that came with a new regulator when I couldn't hold more than 14K for rail. Could have saved myself alot of hassle had I done the cp3 to begin with, and possibly my reman injectors that went shortly after the cp3 died.

 

[Jdiperrio]

Ok I was kinda thinking you guys might say it's the cp3. Thank you