02 7.3 IDM problems - Ford Powerstroke Diesel Forum
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Old 07-13-2007, 09:26 AM
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02 7.3 IDM problems

I'm new to this forum, and new to power stokes. (I come from heavy truck world). My prob: My unit was oper. temp. after 130mile trip.
It was shut down for an hour while my crew ate supper. Upon taking off from the rest. the dash lights and gauges went nuts, and the truck would only run about 5 MPH. The truck idled fine. They pulled over and the dash went back to normal. the truck would then rev normally and I drove it around the block normally. I had it towed back to shop and this morning it operates normally.
Ihave a Snap-On Solus scanner and it only has an IDM code in it. When I run
a self test every thing shows normal. Any ideas??...THANKS
It probably doesn't matter, but all my units are E-450 ambulances.( alll are bone stock)
When truck acted up, it ran smooth, just had very little throttle response.

Last edited by ambulance doctor; 07-13-2007 at 10:06 AM. Reason: updated info
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Old 07-13-2007, 10:59 AM
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Was there any smoke?
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Old 07-13-2007, 12:03 PM
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NO smoke or engine miss
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Old 07-14-2007, 05:34 AM
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It has to be either a harness short from the idm to the pcm or a internal problem in the idm causing a timing correlation concern. I've repaired some w/ a pedal sw. shorting before & had to replace the pedal assy. Check the harness under the dash for any rubbing against metal causing a vref short. Depends on what the idm code is. Could also be a cps causing a timing correlation problem. If they short internally it will cause it to default to idle w/ no throttle response at times.
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Old 01-03-2008, 02:54 PM
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I have truck doing the same thing no throttle response with the check engine light on . check engine light goes off and everything is fine ?? No codes in the scanner ? Is this CPS symptom ??
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Old 01-11-2008, 05:39 AM
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By the way, the problem with my truck was the chassis harness under the hood. I replaced it and it has run fine for several months now. THANKS for yall's help!
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Old 09-02-2009, 10:48 PM
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More info please

Quote:
Originally Posted by ambulance doctor View Post
By the way, the problem with my truck was the chassis harness under the hood. I replaced it and it has run fine for several months now. THANKS for yall's help!
Hi Ambulance Doctor,Could you please go into a little more detail as to what you found and exactly which harness it was that was causing the problem. I have had an intermittent "miss or stumble" for nearly a year and a half and nobody has been able to find it. Thanks.
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Old 09-03-2009, 03:28 AM
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Smile reply from short problem

Hi johns4dor:
Hows things going with you this morn?
On the matter with the short in harness.
AD was most likely talking about the main pcm to idm harness.
If it was it's no fun to replace & you may not want to tackle it.

It consist of part of the pigtail to the pcm & y's of to the idm.
Now the main eng. harness may have a short too if the trk. is old.
The harness becomes real brittle from all the heat & the vibration causes them to break the insulation apart.

Wires start rubbing against metal.
Did you ever get any codes when this type of concern happens?
Does the lite illuminate when it happens.
More detail please.

I my self will not be working on diesel's much longer cause i'm retiring from it & go computer repair full time at my home.

Give me more detail & i'll try to help you.

Maybe we can fix this babe & make you happy

David
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Old 09-03-2009, 04:57 AM
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Quote:
Originally Posted by johns4dor View Post
Hi Ambulance Doctor,Could you please go into a little more detail as to what you found and exactly which harness it was that was causing the problem. I have had an intermittent "miss or stumble" for nearly a year and a half and nobody has been able to find it. Thanks.
My harness was indeed the main chassis harness. Although it was a PIA it is very do-able. My unit is an E-450 2000 7.3L. I R+R the sensor harness on the engine first, but it did not repair the problem. The harness that repaired the problem connected ECM, IDM, sensor harness, brake sensors, etc....Basically everything under the hood to the engine.
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Old 09-03-2009, 09:26 AM
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No Codes

Hi Guys, Thanks for the responses.
Only code I have ever seen during this is "Too low or too high ICP". This thing has been so intermittent that sometimes it will occur several times during 1 day and then may not miss a beat for several months. I have checked the connectors but not found anything there. The CPS went bad a couple of years ago, was replaced with a blue one, then Ford stole that one for one of the gray ones during the recall. I have changed the gray one for another once since then to check that out. Found the ICP sensor plug full of oil once so replaced the sensor, also rebuilt the ICP Regulator recently. Pulled the valve covers to check the harnesses, couldn''t find anything visually, but the right one was all over the place on two injector ground leads when I did an ohmeter check so replaced it. Put clip on the left one. Apparently lost a glow plug right after that, haven't replaced it yet, have a new set ready to go in, so I will have the covers off again very soon. I have worked at the PCM connector a while back when I installed the BD Exhaust Brake Controller. Connected a bunch of new wires to the leads there, but I think theis problem was occurring before I did that. Hard to remember anymore. Bought a scanner that I thought was going to do everything, an Innova, but it turns out that it won't do the function tests on the diesel, so I haven't been able to do a Buzz test or a Contribution test. I am about ready to make an appointment with John Wood and hope he can find something, if I can't find the answer soon.
It has been driving my wife nuts when she drives it and it stumbles. The other part of this problem is that it will seem to be accelerating from a stop like its not under full power, and then all of a sudden it will turn on and take off like you just stomped the go pedal down a bunch. Really strange thing came up yesterday. About 2 weeks ago she went to a Dr. appointment. When she got home she said it had stumbled again, first time in about 3 weeks. She said it did it as she was coming up the freeway on ramp and again as she was climbing a grade that is about 1/2 way home. Yesterday we had to go to the Dr. again in the same hosp., and I was driving. It stumbled in the exact same locations as it did when she was driving 2 weeks ago, on the ramp and on the grade.
All help is greatly appreciated, believe me.

Just thought of something more. 3 times during this time of terror, while accelerating from a stop, one time while under full throttle, it was as if I was bouncing my foot on and off the pedal. Felt almost like a total shut off, not like 1 injector or such but like the throttle was going from open to closed, really bucking, especially the time I had it hammered, but I couldn't back off because I was getting into a fast line of traffic. I just had to keep my foot in it and let it buck until I got in line or I would have caused an accident. It must have really looked strange to the people behind me. I felt very lucky that I didn't get hit with it turning off and on.
Thanks, John

Last edited by johns4dor; 09-03-2009 at 05:19 PM. Reason: Add more info
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