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Discussion Starter #1
I just got my truck back on the road and it was running better than ever . I took it for a test drive to see if the oil leak is fixed . I had driven the truck all day (50 miles) and it was reliable . When I did the test drive it thew the cel and died . The truck started and ran for about ten feet and then died and wouldnt start . I let it sit for a minute and it started and died immediately and then wouldnt start for several minutes and then did and died immediately after .

I changed the cps and nothing different , I changed the IDM and replaced it with one out of another truck , but , it was different and it didnt change the operation either . I had this problem a month ago and there was a code stored , but , my AE wouldnt recognize so I dont know what it was . I cleared the code and the truck went back to running right . This time there is no code stored and the cel light isnt on past the initial key turning .
 

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Can you buzz test with your AE?
 

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OK the truck was running great , but , I havent been able to find the root of the problem . So I drove it over to buddies house to change the plug ends that had broken retainer clips and look for shorts in it . I found some bare wires at the end of the plug under the intake and thought this has got to be it . So I pushed the pins out and put them in the new ends . I made sure everything(all the wires) was in the same order. I made sure the pins were in securely . I coated everything with di lectric grease and re installed . The truck wont start at all now . The motor spins and spins no smoke no nothing. I ran some onboard diagnostics with my AE . I got a p1663 and a p0475 . I did a buzz test and no buzz . I got a p1668 code saying there was no connection to the pcm/idm. I did a live data meter while cranking and the icp spiked to 3300-3400psi and then dropped off like the ipr is working . So what the F now?
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Discussion Starter #6
IDM and PCM relays under hood have 10 volts

Reference voltage checked at cps , icp , and all four plugs for inj. voltage checked to be 5 volts .

pulled oil fill cap and listened for inj. clicking while turning engine over with and w/o icp plugged in . No inj. clicking or noise.

checked uvch on passenger side all appeared to be new.

pulled engine harness inspected for shorts and bare wires . no shorts or bare wires.

Could not get a buzz test from AE p1668
 

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DTC 1663 indicates to the pcm that there is a failure in the fdcs chain
possible causes
open short in fdcs circuit
non powered idm
IDM PCM

DTC 1668 is basically a communication error between the IDM and PCM

If i had to wager a guess your IDM is no longer getting any power that would explain why its not running and the communication error

The other code is a exhaust backpressure malfunction detected not any relevance to your problem i dont think...
See if that could be the problem....:ford:
 

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Discussion Starter #8
What is fdcs?
How do I know if my idm is powered? Why would it not be powered?

Where would an open short be ? I have looked at the uvch and ovch . replaced the plug ends and pulled the entire engine harness off stripped the loom off and cant find any bare wires. Could it be before the 42 pin connector . like where the idm ,fuse box,and pcm share the big wiring harness?

I dont have the same turbo pedestal so there is no ebpv anymore.
 

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FDCS is fuel delivery command signal its the output that controls fuel injection timing and fuel quantity with the IPR. This signal is sent with the cylinder identification signal to the IDM which provides power and distributes to the proper injector

On your IDM you will be looking for pin number 17 it should be brown/orange which is the FDCS feed into the IDM and pin number 2 which is gray and red should be the signal back.... To really test this you have to have a breakout box.... just a standard voltmeter may work its pretty low voltage .6 going in and .1 returning.... As far as the IDM itself losing power i dont know which wire is its source i will check in the morning tho. If there is no voltage present on the brown orange there is a short and that would be your issue
 

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Discussion Starter #10
Fuel injector pulse width 2.66
ICP duty cycle 35.54
152 rpm while cranking
ICP 2461
ICP volts 2.5
 

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Discussion Starter #11
Alright I changed the IDM back over to the one out of my 1995 . I hooked up a mechanical oil gauge . I Cranked the motor over for about 5-8 seconds until the motor fired up and ran . It took that long to generate enough psi to start the motor .Motor was missing and I found a bent over pin in the vc outlet plug. I fixed the bent pins and started the truck up and the miss is gone.I need to put everything back together so I can drive it and see if its going to quit again. The motor is still taking forever to crank over when it starts . When I get it put back together and back to driving I hope the extended crank problem goes away due to it having air in the hpo lines. Jonathan at swamps seems to think air is the issue with the extended crank time. I am anxious to see for myself. Should the truck no start again I think the inj's at the rear of the drivers side may have the electrical problem if there is one.


OK back to the same ol same ol. Truck drove about 20 miles w/o a hitch. Then I pulled up in the driveway and shut it down to see if the extended crank was gone after the hp oil got rid of the air. Truck started right up so I killed it . Started up again and got the cel rough running . Scanned it no codes . Ran the buzz test AE said problem encountered and needs to shut down . Exited out of program and started program again ran the buzz test option the engine gave me a perfect buzz test , but , it set the cel light when it did . I wanted to hear the buzz test again so I selected it and said problem encountered AE needs to close and didnt buzz. I tried to record some live data of the truck running poorly , but , I dont think I got it saved properly . I am afraid that whatever it is will kill this IDM also.

Any thoughts guys . I still havent pulled thr drivers side valve cover , but plan to this weekend . A mechanic buddy told me he had one do something very similar and that was a short in the ignition switch . I dont know I am out of guesses. Can ford plug into it and find the problem w/o having to do several hours of diagnostics or are they just as limited as I am ?
 

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I am confused. You said in a revious post that you checked ALL of the uvch and now your saying you haven't pulled the driver side valve cover yet. If I were you I would pull the driver side cover and make sure you don't have a problem there. I would actually suspect your problem to be there since you have pulled and checked everything else so far. If you have a shorted wire under the driver side valve cover you will end up burning up another IDM and that would explain why it won't do a buzz test.
 
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