97 truck is dead again - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

 
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post #1 of 7 (permalink) Old 05-07-2019, 02:44 AM Thread Starter
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97 truck is dead again

A few months ago, I replaced the IDM, and the truck had been running perfectly. Last week I replaced both batteries because they were getting old and slow to crank and finally just wouldnít crank. I drove just one day after replacing them and it ran perfect. Parked it on level ground and the next morning, dead.
I immediately suspected the IDM because it is not fuel, as there is 25 psi like always at the bowl (I replaced the Schrader valve with a fuel gauge). Had another IDM sent to me, replaced it and much to my surprise itís still dead, with not even a hint of firing.
Iíve done the usual: checked all fuses, unplugged ICP, tach reads about 200 while cranking, has a new Ford CPS, WTS comes on and goes off as usual, itís still dead. Only thing I havenít done is checked oil at HPOP, because the Allen head bolt stripped for the right size wrench, so Iím going to try tapping a Torx male socket and see if it comes out, and replace it with new one. I doubt that ití is that, because oil has always been full, and with all the cranking I have done, it wouldíve filled back up, and this happened after a full day of driving, and last week, it sat for over a week, and after I replaced the batteries, it started in les than 3 seconds of cranking, like it always does.
Iím going to try swapping around the IDM relay, but I canít remember which one it is, because it still sounds electric to me. I know there is fuel in the bowl and fuel pressure, and mechanical problems donít show up like that, from 100 to 0 in one day.
The truck is 100% stock and other than these episodes, always reliable.
What else am I missing. Any help will be appreciated.
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post #2 of 7 (permalink) Old 05-07-2019, 11:50 PM
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Is the tach reading while you are cranking and does it sound like it is cranking over at a good speed?

Have you checked the battery voltage?

I agree it sounds electrical, perhaps check the cps connection.

On the HPOP reservoir, if you have a Harbor freight close by pick up some left handed drill bits and then use a reversible drill. A large bit will bite into the plug and spin it right out.

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post #3 of 7 (permalink) Old 05-08-2019, 01:49 AM Thread Starter
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Thanks Bugman, I posted you a PM.
I hope this can help others with the sane problem.
The problem was the IDM relay. It is the number 2 in the fuse box. I replaced it with the one that was in the number 4 socket, which I believe is for a trailer tow package, and the engine fired right up, as if nothing had happened.
It feels good when it goes from 0 to 100% by just replacing a relay.
I donít know if a scan with AE or any of the other code readers would detect a faulty relay, but when the symptoms sound electrical rather than mechanical, that relay has to be kept in mind.
Thanks
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post #4 of 7 (permalink) Old 05-11-2019, 06:55 PM
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I've attached the Power distribution diagram pages that might help you. Cheers!
Attached Files
File Type: pdf Power Distribution pg11.pdf (201.6 KB, 7 views)
File Type: pdf Power Distribution pg14.pdf (225.3 KB, 6 views)

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post #5 of 7 (permalink) Old 05-11-2019, 11:30 PM Thread Starter
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Thanks Patrick.
I am going to try to figure this thing out.
I just checked the voltage at the IDM relay socket, and there is always 12 volts at contact 30 even with the key Off, and when the key is On, there is also 12 volts at contact 86, which is the way it should be for the IDM should be energized. But itís not starting.
So I have to discard the relay issue and try to find the problem elsewhere. All the signals are ok, like fuel pressure, ICP, CPS , WTS, RPM, so what else could be causing what appears to be, the injectors not firing. The IDM is also new.
What else could I check?
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post #6 of 7 (permalink) Old 05-13-2019, 02:26 AM Thread Starter
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Hey guys, if the CPS were bad or erratic, would it show the tach moving while cranking.
Do the Apps such as Torque tell you if the CPS is bad?
Since what I have sounds electrical because it either runs perfect or doesnít run at all, no in between, and I have discarded the IDM relay, the IDM itself, fuse 22 and all the rest, ICP off and on, good fuel pressure, oil in HPOP, I have a fairly new OEM CPS, could it be erratic and work off and on?
What else am I missing?
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post #7 of 7 (permalink) Old 05-13-2019, 09:33 PM
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Here are some more diagrams. IDM will have power at IDM connector pin 14 when the PCM Power relay shuts and then pulls the IDM relay shut. The power out of the IDM is high voltage DC, so don't go probing those wires! Cheers!
Attached Files
File Type: pdf IDM Connector Pinout.pdf (313.7 KB, 2 views)
File Type: pdf Engine Controls pg1.pdf (253.0 KB, 2 views)
File Type: pdf Engine Controls pg4.pdf (259.0 KB, 2 views)

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