Join Date: Sep 2009
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Starts, runs smooth for a minute, then lopes/misses, and dies.
My 96 7.3PSD has stumped me for a while now. It starts okay, idles smooth as a baby's bottom for a minute or two, then lopes badly for 15-30 sec and shuts right down. Will not restart unless I let it sit for a while, sometimes a few minutes is enough, but it just repeats the same symptoms.
It doesn't set a CEL. Ive watched fuel pressure at the schrader valve and it doesn't drop off. Bounces around 55-65 the entire time. Doesn't leak down after it dies either. HPOP res stays full. Fuel bowl stays full. I thought maybe it was the IDM, I pulled it apart and it did have some moisture in it. I cleaned it well with contact cleaner. I'm not sure I think it the IDM anymore with how repeatable the issue is and the fact it runs fine at first. Maybe the HPOP isn't pumping after it warms up? But you wouldn't think it would act like this... Truck has 340,000 and AFAIK its never had injectors or HPOP done. Just glowplugs/relay and a turbo and a few clutches and some pulleys. I swapped out the CPS just in case, but no effect.
EDIT: I did remove my pot from the ICP circuit to take it out of the equation. Is there any chance I could have hurt something in the PCM by having it in there? I believe it is a 0-10k pot, I did add a resistor inline so I could never go below a certain resistance, maybe 2 or 5k? Don't recall.
Any ideas without access to a scantool? Can I monitor hpop press using the icp sensor and a voltmeter/ohmmeter?
96 SCLB F-250, 4x4, 5spd
900ft/lb Valair Clutch/Solid Flywheel
3" MBRP downpipe
4" MBRP Turbo-back in to dual 5" stacks, all straightpipe.
DIY Tymar Intake
BB in FPR
Potentiometer in ICP circut
VDO boost and pyro gauges on the A-pillar
RSK/SD springs up front
Shackle flip in rear
Homemade traction bars
Rosewood Stage 2 sticks
Last edited by Boss.Hoss; 08-29-2011 at 11:21 AM.