97' 7.3L Powerstroke/Possible IDM Failure? - Diesel Forum - TheDieselStop.com
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Old 06-26-2005, 04:14 PM   #1 (permalink)
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97' 7.3L Powerstroke/Possible IDM Failure?

I was hoping some powerstroke veteran might help me out here. My pick-up (97'F-250 4WD. extended cab 7.3L Powerstroke/Auto. trans.)started giving me greif last week. I would be driving along and the engine would quit as if the key was shut off. I would restart the engine immediately after and it would run fine. I would drive short spell (2-10 minutes) and the engine would quit again, just as it had before, like someone had shut the key off. As I continued to drive the frequency at which the engine would quit increased to the point at which I could no longer drive my truck, the truck would have to sit for several minutes, sometimes several hours, before it could be re-started, and then only run for 30 seconds to one minute.

I checked all of the fuses but I wasn't able to check the relays as I don't have a schematic to tell me what relay belongs to what function.

I borrowed an OTC reader from a friend and after clearing codes, running the engine, having the engine quit, and checking for codes, I consistently come up with 2 codes - EGR boost sensor fault(I wouldn't think that would cause the engine to quit?) the second code was "IDM failure" which I'm assuming could be my problem.

Is there anything to check that pertains to the IDM circuit(wiring, relays, circuit breakers, fuses, etc.) before replacing this component? Does IDM stand for Injector Driver Module?

Thanx in advance for any help!

Glen
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Old 06-26-2005, 05:16 PM   #2 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

IDM does infact stand for Injector Driver Module.

There is a guy on ebay down in Davie, Florida selling them rebuilt for $299 and you send yours back to him as a core.

I have conversed in email with him and he says the #1 reason for IDM failure is they get water in them and fry.

That is the cheapest I have found...Ford wants $840 for an IDM.

Kris
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Old 06-26-2005, 05:52 PM   #3 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

Thanx Kris! I had no idea they were so expensive, I should probably confirm for sure that the IDM has actually failed. For a $50 part I wouldn't mind taking a chance but for $300 to $900, I think I'll make darn sure.

Any ideas or suggestions on how to confirm if the IDM is actually faulty?

Thanx in advance!

Glen
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Old 06-26-2005, 05:54 PM   #4 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

Oh yeah, one more question, where is the IDM located and what does it look like?

Thanx

Glen
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Old 06-26-2005, 05:59 PM   #5 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

A short in the Under Valve Cover harness will also show an IDM failure code, but normaly will only kill one side of the engine. I doubt that is the problem, but wouldn't hurt to look at.

Look in the for sale adds here, there are a few IDM's available. they are all interchangable 94-'02.

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Old 06-26-2005, 06:07 PM   #6 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

what you have is a classic sysmtom of a CPS failure, very common as the part does not physically wear out but does fail. teh IDM should jsut fail and stay that way, I would start by replacing the CPS first , then if it still does it then pull your UVC harness adn have a look for burnt wires. Barrign all that replace the IDM, but I doubt if that is the cause for what you have, it would start to shut off one side first before it cut out completely.
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Old 06-26-2005, 06:37 PM   #7 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

do you have a buddy with a psd... if so maybe you can borrow the idm for a check to see if your is bad.
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Old 06-26-2005, 06:52 PM   #8 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

Thanx for the replies! What is a CPS? Where is it located? How will a failed CPS translate into a IDM failure? Also, what is a UVC harness?
Sorry for all of the questions guys, I'm not familiar with automotive/Ford diesel terminoligy.

Thanx again


Glen
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Old 06-26-2005, 06:56 PM   #9 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

Glen,

The IDM is located on the Drivers side fender near the firewall (the big silver box)....Not to be confused with the PCM which is directly below it on the firewall (have to take the fender apart and pull it out of the firewall to get the PCM out.)

The CPS sensor is on the passengers side front of the motor...Look for a thread posted yesterday on the CPS...I lined a guy out on the where's and hows.

[ QUOTE ]
Oh yeah, one more question, where is the IDM located and what does it look like?

Thanx

Glen

[/ QUOTE ]
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If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.
-- Samuel Adams, speech at the Philadelphia State House, August 1, 1776.
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Old 06-26-2005, 06:59 PM   #10 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

CPS is the cam (crank) position sensor...tells the computer when to tell the IDM to fire the electric over hydraulic injector solonoids which in turn allow hydraulic (oil) pressure from the HPOP (High pressure Oil Pump) to fire the injector(s).

And the leg bone connected to the knee bone... [img]/ubbthreads/images/graemlins/laugh.gif[/img]

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Old 06-26-2005, 07:04 PM   #11 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

Camshaft position sensor........ahhhh! That would be an easy and cheaper place to start first but wouldn't I read a fault code from the PCM regarding the camshaft position sensor/wiring if it was faulty? Remember I'm consistantly getting IDM failure fault codes when I retrieve the fault codes.

Thanx again!


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Old 06-26-2005, 07:07 PM   #12 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

I would think so glenn...But stranger things have happened...My truck died on me out of the blue and threw no codes at all.

I'm still working on it...I replaced the CPS on mine and it was not the problem on mine...But it is always worth a try... $107 at the local parts store here in Arkansas.
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If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.
-- Samuel Adams, speech at the Philadelphia State House, August 1, 1776.
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Old 06-26-2005, 07:33 PM   #13 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

Thanx a bunch for the help Kris! Where does the IDM get its supply voltage, could I be looking at a faulty relay, fuse, circuit breaker, fuseable link, etc.? If not, I'll likely replace the CPS first and if that doesn't do the trick I'll check the wiring harness inside the engine under the valve covers and externally as well to make sure I don't have any shorts/opens/high resistance. If all that fails to yeild results I'll try and find someone with a PSD and swap the IDM before I dish out the coin for a new one.

I'm really hoping it's the CPS! LOL
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Old 06-26-2005, 07:57 PM   #14 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

I'm still somewhat green on these little "migit" diesels. I've been burying myself in Chilton and getting tips from the real guru's here on the board myself...

That said, I've been told that Maxi-fuse #8 under the hood is for the IDM (Info recieved from RSP) and that one of those two relays next to the fuseblock is also associated.

[ QUOTE ]
Thanx a bunch for the help Kris! Where does the IDM get its supply voltage, could I be looking at a faulty relay, fuse, circuit breaker, fuseable link, etc.? If not, I'll likely replace the CPS first and if that doesn't do the trick I'll check the wiring harness inside the engine under the valve covers and externally as well to make sure I don't have any shorts/opens/high resistance. If all that fails to yeild results I'll try and find someone with a PSD and swap the IDM before I dish out the coin for a new one.

I'm really hoping it's the CPS! LOL

[/ QUOTE ]
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If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.
-- Samuel Adams, speech at the Philadelphia State House, August 1, 1776.
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Old 06-26-2005, 09:33 PM   #15 (permalink)
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Re: 97' 7.3L Powerstroke/Possible IDM Failure?

If you would like my old CPS sensor to test with you are more than welcome to it. I do not think anything is wrong with it.
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1992 F-350 7.3 CREW Cab Dually Long Box

If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.
-- Samuel Adams, speech at the Philadelphia State House, August 1, 1776.
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