97 f350 died driving wont start need assistance - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 03-23-2013, 10:15 AM Thread Starter
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97 f350 died driving wont start need assistance

Just bought 1997 f350 cclb dually 7.3l zf5 4x4 242k miles.

Started at the guys house but cold natured so I'm pretty sure it needs glow plugs, changed gpr already with a known good one.

I was driving it home ran perfect cruising at 70 and all of a sudden it died. Coasted to stop and ended up having it towed home.

At first there was no wts light so I checked all fuses in cab and under hood they are good, fuel heater was already unplugged when I got it. Also changed cps with a new known good one tach moves while cranking.

Pulled pcm and turns out it had a really poorly installed superchips chip on it, pulled that off and reset batteries, wts light came on and verified glow plug system working. Still wont start, suspected pcm bad so I plugged up the edge cts from my 02 and it seems that the pcm is working properly, all readouts are good and it is showing code p0470 exhaust back pressure sensor malfunction. while cranking I am getting 4-500 psi, while cranking with icp un plugged I get 2500 psi and it throws a code.

Fuel pump and filter are new, Schrader valve is spitting fuel while cranking but hardly any smoke comes out.


What am I missing?, IDM, icp, ipr? I didn't figure they would go out all of a sudden, I have tried starting fluid (I know bad for it, tiny sprays) and wd40 to no avail, block heater is plugged in and oil temp is 85*. I cant figure this out. Batteries are good, have them hooked up to a jumper box, its cranking over at normal speeds but drops to 9ish while cranking.

Its got me stumped hate to think I wasted money on this truck, I've always wanted a 4x4 obs with a 7.3 and zf5.

thanks

truck in question:

Last edited by Shadowfax; 03-23-2013 at 11:51 AM.
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post #2 of 16 Old 03-23-2013, 10:29 AM
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new one here,sorry about youre woes,? for the elite on this site,say it is the i.d.m,can you test electric pulse from it at valve cover connections?
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post #3 of 16 Old 03-23-2013, 11:05 AM Thread Starter
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high side power to injectors at valve covers hits max 4.5 volts while cranking and all the low sides are 0.00. Glow plugs are all getting voltage, and when I put the volt meter on the IDM power and ground wires it is showing good voltage.
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post #4 of 16 Old 03-23-2013, 01:52 PM Thread Starter
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I swapped the idm from my 02 in and it fired right up!

only code p0111 system pass.

so a new idm is on the way. must have shorted it out some how
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post #5 of 16 Old 03-23-2013, 02:15 PM
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so can one trust the voltage test or not?on i.d.m.
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post #6 of 16 Old 03-23-2013, 02:28 PM
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IDM voltage should be 100+ volts, but it's a pulse, so most meters won't measure it correctly.

Shake the old IDM and listen for water. Or just take it apart.

Weird that you got any smoke at all. With inop IDM, you shouldn't have.
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post #7 of 16 Old 03-23-2013, 03:24 PM Thread Starter
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I think it was the wd40 causing the smoke. After seeing the center wire voltage at the uvch was less than the voltage going in to the idm I figured something inside wasn't right.

Im just glad to hear it run, I figure new batteries, glow plugs and idm should fix its starting issues.

With the newer idm it still wouludn't start without the jumper box on 200a and a shot of either. hopefully the new parts will take care of it.
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post #8 of 16 Old 03-23-2013, 04:20 PM
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i am thinking there should be a tester to plug in at v.cover harness,a simple tool, to check hi volts and at same time prove c.p.s is operating,any thoughts?
i mean wouldnt be nice to have a 20$ tool in glove box to quick diagnose
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post #9 of 16 Old 03-23-2013, 05:38 PM
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^^^^ A 100-140 VDC noid light. Hmm, does such a thing even exist?....
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post #10 of 16 Old 03-23-2013, 06:51 PM
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just thinking outloud,is it worth investigating,i cant seem to find out the longjevity of the idm,seems quite popular on the parts change list,160 plus dollars for one,do i just change it and watch odometer and change again at 50k?40k?
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