Join Date: Apr 2005
Feedback Score: 0 reviews
Daily summer stumble
For the past week I have lost power/rough idle consistently about 1 mile from home - to the point where I can pull into the same lot and wait for the engine to warm (from ambient 70*F). It almost feels like a UCVH went or ran a tank dry - but then everything returns to great the rest of the day!? I haven't noticed smoke but in my haste to troubleshoot with a scanner, I also haven't got out to see the tailpipe...certainly no big cloud.
I have no codes and after it warms up it runs great the rest of the day - plenty of power. I ran the KOEO and KOER tests on a SnapOn reader - without getting any codes. Thinking it might be the EOT sender, even though it seemed to read okay, I replaced it without change (HPOP reservoir was full). Made sure fuel tanks were full as the first time it happened I was less than 1/4 tank and thought I might have sucked air going up a hill.
As background, about 2 months ago I replaced both fuel tanks, fuel pick-ups, filter, fuel pump (was weeping), and all the o-rings on the fuel bowl since most were original (did a thorough clean of the bowl as well)...fuel system is clean. I do not have a EBPV anymore - removed pedestal completely with turbo replacement 3 years ago. It has run great since doing the above work.
When it stumbled this morning EOT=31*C, IAT=23*C, ICP 575-590, MAP 14PSI, InjPressReg=10-12%. At about 43* EOT everything smoothed out and I resumed my commute without problems like normal. By the time I was at work (post freeway) EOT=71*C which matches my aftermarket coolant gauge of 160*F.
Since it doesn't seem to occur any time but first thing in the morning and "goes away" consistently so I haven't tried CPS or dug into the UCVH (no burnt connectors visible or burnt smell).
I searched the forums and cannot find anyone having this trouble "cold" in the summer except folks with EBPV's...so I am at a loss as to what to explore next short of throwing parts at it (PCM?). Anyone have such an experience?
Thanks in advance for any experience and wisdom!
F250HD 1997 4x4 PS-Diesel Crewcab, MT,
Ron's 1.00 turbo, EBPV-delete, BD downpipe, felineless, Baby Swamps, TS Performance chip, pillar pod/pyro-boost-temp, 245k miles.