another lbz and p0087

Harbin_22

Harbin_22

Active member
Dec 4, 2010
3,858
7
38
Southern Indiana
THEFERMANATOR said:
Helped a friend with the same issue on an LMM just a few weeks ago. Once the fuel gets hot they seem to be bad about returning to much fuel.
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I had an LBZ like this too. It would run great on any tune that was in it, pull a bass boat for hours on end just fine, but hook it to a camper and hour and half down the road she would be in limp cruising at 60mph. It would hold rail pressure just fine but if it needed to speed up, desired rail would go up and actual was very slow to follow, but would be climbing. Once the fuel got over 180* or so, it would get to slow on actual following desired, and throw the code.

I had input on a thread around here somewhere with part numbers.

I put a derale(sp) cooler out in front of the stack, inline before the fuel filter on the supple side and it has never happened again. I logged it some afterwards and the fuel never went over 160*.
 
Harbin_22

Harbin_22

Active member
Dec 4, 2010
3,858
7
38
Southern Indiana
Pay close attention to how fast the actual follows desired too. It would follow but too slow and it would get outside the 3,500 psi window for just a little bit too long and set the code. There is limit foe the amount of time it can be out of tolerance before it limps. I just finally made him hook his camper up and go drive around in 100* heat until it stares doing and then I started logging and found that problem.

That cooler was less then $100. I did all the fuel line changes in the tsbs too with no help.
 
Ne-max

Ne-max

I like turtles
Nov 15, 2011
3,361
64
48
Lincoln, Ne
Buddy had the same issue. Every time he took it into the mountains with his toy hauler it would limp it out. We changed the rubber fuel lines and shimmed it. Seemed to take care of the issue. Would not do it around here pulling a skid loader so it was hard to diagnose.
 
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