Both IDM and PCM failure?? Really? - Ford Powerstroke Diesel Forum

 
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post #1 of 10 Old 12-04-2010, 07:38 PM Thread Starter
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Both IDM and PCM failure?? Really?

OK, here's a stumper...any and all help appreciated. I was driving my late 99 F250 when the low fuel light came on. I drove about 3 miles after the light came on and it sputtered and died at a stop light. I assumed I ran out of fuel but thought it was wierd that I only made it 3 miles after light came on. So anyway, FINALLY got it restarted after lots and lots of cranking (and just a very small amount of starter fluid). I drove it a couple of miles and filled the tank. It drove like garbage...no power...very rough...it then went about 1/2 mile further and died....would not restart after that. Towed it to Ford Dealer.

Dealer calls me back and says both the IDM and the PCM are out and that will be $1750 total. I towed the vehicle home to fix it myself. So here I am.

The wait to start light still acts normal. No SES light has come on at all. The only code the dealer was able to get was P1670 (I think that was it)...the one that is IDM failure.

So I thought I ran out of fuel and now am told it is $1750 to fix it. HELP PLEASE!!! I've ordered a reman IDM, but before I throw money at it I would appreciate some input.

Thanks
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post #2 of 10 Old 12-05-2010, 12:45 AM
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sounds like a CPS problem ... for 25 bucks i would try changing that first..

Early 99 7.3 F350 auto,TN T-4 mount with a s467 thanks to unlimited diesel..shimmed 910's, DI push rod's, new alliant 315/200 hybrids, full fuel with a fuel lab 4202,TSD sump...tuned by Gearhead..i cant wait to drop her in the truck...
88 F250 7.3 IDI plow truck - bone stock
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post #3 of 10 Old 12-05-2010, 06:31 AM Thread Starter
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I will give that a try.
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post #4 of 10 Old 12-05-2010, 06:45 AM
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no start

Check if your 30 amp pcm fuse is blown. If it is check the fuel heater under the fuel filter, it may be shorted out. Good luck
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post #5 of 10 Old 12-05-2010, 08:58 AM
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Quote:
Originally Posted by mooseracer96 View Post
Check if your 30 amp pcm fuse is blown. If it is check the fuel heater under the fuel filter, it may be shorted out. Good luck
yup i unplugged my heater, just to be safe. ha.
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post #6 of 10 Old 12-10-2010, 12:41 PM Thread Starter
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Replaced CPS. Checked all fuses, all good. Replaced IDM with Reman IDM. Still no start. Everything on the dash acts normal. I have yet to replace PCM like dealer suggests. Before I do, is there any chance that this could be the under valve cover harness issue? I'm getting a slight oil leak from one of the valve covers so perhaps I should just get in there a do that first.

Any other suggestions greatly appreciated.
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post #7 of 10 Old 12-19-2010, 12:29 PM Thread Starter
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Thank you POWERSTROKE.org!! Here is why these forums are so great:

I originally told my dealer to test the fuel pump as part of the diagnostics and they flat out told me the pump was good. They concluded $1750 for IDM and PCM per original post. Thankfully I did not buy into that diagnosis and turned to the forums instead. Even though the replies to my post did not solve the problem, my searching of other posts educated me to solve it. I finally decided to check fuel pressure myself and it turned out that the fuel pump was only generating 10 psi. The pump was fine but there was a small, very small, restriction in the fuel supply line upstream from the pump. I removed and clean the tank, but honesetly it was pretty darn clean.
So I paid my dealer $74.95 to lead me in a totally wrong direction. Can't wait to see how they handle this disgruntled customer tomorrow. I should have never taken it there in the first place. Thanks to all who participate in these forums.
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post #8 of 10 Old 12-24-2010, 04:35 AM
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Did you have to replace anything or just drop the tank and clean the lines?

'99 F350 SD, 7.3L Diesel
SuperChips 1700, Dual 6" Stacks, 8" Lift
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post #9 of 10 Old 12-26-2010, 12:37 PM Thread Starter
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I just groped tank and cleaned lines.
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post #10 of 10 Old 12-26-2010, 12:37 PM Thread Starter
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Dropped not groped.
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