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Old 08-19-2013, 01:48 PM
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96 7.3L Randomly won't start and misfires

For the last month I have been having issues. It started with the truck dying every 30-45 seconds on my wife. Once she got it home, I ran a scan tool on it, found a bad CPS, which I replaced. However, that did not solve the problem. 14 out of 15 times, the truck runs just fine. Out of the remaining times, it cuts out (misfires) for my 15 minute drive to work and about once a week, it just won't start. Most of the time it runs perfectly fine once the scan tool is hooked up and monitoring it. Today, I was able to get some preliminary readings before it decided to run normally. I was getting (wjhile cranking) a fuelpw signal of 0.000, ICP reading of 0, the IPRDC was 54%. And when I went to check the VPWR and the RPM readings, the truck started just fine, with all readings returning to normal.

The truck is a 1996 F-350, 2wd, auto, and 274k miles. The EBP has been gutted and the exhaust has been replaced with a down pipe back system, other than that, it has no mods. Recently (within the last 18 months), I have replaced the IPR (remanufactured, and it would stick once the truck fully warmed up), the fuel lift pump (it was leaking), the IDM (it failed, and I replaced it with one from a junk yard), the CPS (as mentioned above, I had a trouble code for that one), and the ICP sensor, as it was leaking oil through it. I have changed the HPOP oil this week just to make sure that wasn't the problem (it had been 8,000 miles since the last change, I change it every 10k), and the oil was changed a hair under 3k miles ago.

Most of the time that it is giving me an issue, it is late in the afternoon and hot (+95*). So it isn't an issue with the glow plug system. There is no sign of a high pressure oil leak, either internally or externally.

This truck is starting to frustrate me, mostly because I can't find the problem. Does anyone have any ideas to help me fix this or at least find my problem?

Last edited by DougH000; 08-19-2013 at 01:57 PM. Reason: Wrong subject title
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Old 08-19-2013, 08:12 PM
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Maybe take a good hard look at some of the connectors on the sensors/other such as the ICP, CPS, and IPR. Is the EBP sensor still installed? Also maybe disconnect he fuel heater (if not already) as it can cause problems without blowing the fuse (it will blow the fuse most times, but guys have reported it not doing it). Cheers!
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