99 F450 7.3
when you turn on the wiper delay, not slow or fast, just delay, truck dies with no codes, kills live data on scanner just like someone shut the key off and then turned it back on, but faster,

cold mornings now and it dies going down the road, always restarts, if it idles it will die completely, going down the road it bucks you into the seatbelt and sounds really bad on the trans and then fires itself back up, standard trans, No one at ford seems to know anything, they gave me a list to start replacing until the problem is fixed, GEM module is what I am starting with tomorrow. I am sure its electrical, but Ford couldnt get me a wiring diagram and what they did have seems to feed into and out of this GEM module, no test for the GEM and no return if it was plugged in, Ford got you there, any suggestions will be helpful

Also it would be nice to know how the PTO and Brake Factory wiring is installed, all the wires say SEE BODY BUILDER BOOK, and of course, Ford dealer had never heard of such a thing, but they did find one, but they cant get it, dont understand that one either.

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Well $200 bucks and 2 hrs to change the GEM module, and it changed nothing. Still dies with the wiper delay on, pulled fuse to wiper motor, no die, pulled the park relay, no die, replaced, still dies, have a new wiper motor ordered for tomorrow
any ideas guys??

 

get some RainX on the windshield and never have to use the wipers again

seriously though thats weird. how long has this been going on, or did it just happen randomly.

 

Does it do it every time?
I would check the draw of the wiper motor before I replaced it.
How far down on the list is the actual signal/wiper switch?

 

i would start checking the wires coming out the back of the fuse block and see if some of them are rubbing or have exposed wires some where there has to be a short, or real bad interferance coming off a wire

 

this is for Benjamin
he PM me and I cant figure out how to reply or send a PM on this forum, I guess I am getting old
I have the old GEM I took out but its for a truck with NO power windows and NO shift on the fly 4wd, so it wont do you any good if you are needing it for the shift on the fly 4wd

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wiper motor is cheap, 50 bucks, easy to replace, I am just changing it to eleminate it, because if it is unpluged, the engine stays running with the wiper delay on
as far as long as it has been doing it, about 6months, everytime it rained my truck would die, never could figure it out, I would leave the truck running and I would pressure wash the engine, up the fender to the IDM, down the firewall, never could get it to die or act up, then one day I use the bug juice squirter to get some bugs off and it died, so I played with it and found it dies at any time the wiper delay is on at random, but not if on high or low wiper, so I just didnt use the wiper delay, now it dies the same way in the cold until it is completely warmed up, I have gone as far as to buy a OTC scanner to watch the live data driving and freeze frame when it acts up, but all you get is no data just like you shut the key off when it does it nothing changes just before it does that
this just reminds me why I hate working on auto, I will take construction equipment any day. I work on high tech square wave pulzars control hydraulics and its easier to troubleshoot then this.

 

you have to have ten post before you can PM

 

did that when I had the fuse block pulled out to replace the gem module, thats a sob to change

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well I am getting closer, and that made me feel better, I am not a dumb as I thought then.

 

just givin ya ideas, you might want to check the plug going into the wiper motor since you say it works fine with out it pluged in, if that plug got hot for any reason either engine heat, or short in the wires if that plug melted inside that could be your short

 

spent 8hrs on it today, nothing has changed, the only weid thing found is the scanner shows 4volt for ref voltage supply which is suppose to be 5v and is 4.995-4.998volts at the sensors on the engine which is correct

I did pull some strange codes that I cant find any more information about
P1668
P1280
any body got any input on those codes and what could have caused them

this weekend I am going to pull the computer out and blow some fuses on the ground and power pins and check the amperage of them, it got dark today, but I am at a loss right now

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found one
FJ1 DIAGNOSTIC TROUBLE CODE (DTC) P1670 and P1668

DTC P1668 and P1670 indicates that a communication error has occurred between the PCM and the IDM.
Possible causes:
Open fuse
IDM relay
Open or shorted IDM enable circuit
Open/short in EF circuit
Open/short in FDCS circuit
IDM powering circuits
PCM
Check for other codes.
Key on, engine off.
Perform KOEO On-Demand Self Test and retrieve Continuous DTCs.

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ok going back through the stored data in the scanner, I got those codes with a bunch of others while I was unhooking sensors and checking the ref voltage at the sensors, so they are of no use. I caused them.

 

buy a dodge that will fix everything