01 F250 7.3 w/80k miles had been parked about a month, started, drove about 1\2 mile started missing then service engine soon light came on & then it shut down &would not start. Checked codes with a predator tuner and has a p1316 IDM code. Changed cps, tach moves when cranking, checked glow plug continuity on valve cover connectors, checked Injector resistance & wiring test from IDM module connector ( instructions on GB website) checked fuses. Do I have a bad IDM? or have I missed something? thanks

 

P1316 is just the high level code, it would be nice to know the lower level codes because they are much more specific. Can you get your hands on a better scan tool like AE or something similar?

Does your Wait to Start light come on?
What is your battery voltage while cranking?
Did you write down your injector ohm readings when you performed the GB test? Did you use this guide? (see attached)

 

Moved to the 1999 - 2003 7.3L Power Stroke Diesel forum.

 

I would be willing to bet the farm on the under the valve cover connector/s are loose.. Same thing happened to my 99 at 75K.... SEE the following to fix it..
https://www.ford-trucks.com/forums/8...ck-shakes.html

 

Yes, the wait to start light comes on, & that is the injector wiring test sequence I used, that should have tested the harness & plugs under the valve covers, also I had a battery charger on the Right battery & jump pack on the left battery so the cranking voltage should have been ok. thanks

 

Could be a the IDM fuse or the IDM power relay.

Check fuse in pos 27 and relay in pos 32.

You can swap the Blower Motor relay with the IDM relay

Under Hood Fuse and Relay Box 99-01:

 

Robin gave you some good stuff to try. Where do you live? Maybe someone has a scanner and can do a buzz test. That would retrieve the codes stored in the idm from the 1316 you got.

 

I rechecked the fuse and had allready swapped the relays. I guess I'm going to have to buy a AE scanner, I also have a 08 6.4 so it will probably be used & my sons have 6.0 & 6.4 diesels also. Where is the best place to buy the AE with the total Ford bundle ? thanks

 

AE at Riifraff Diesel Performance.

 

Stricky Diesel also has them. I think Clay is at some event in TN and there may be some delay in shipping.

AutoEnginuity PC Scan Tool

 

^^^Agree. Best place is from Clay. Will also connect to the 2011 6.7 diesel and Ecoboost as long as you get the version 9 software.

IDMs don't fail by sitting for a month unless they fill up with water. Not sure how that happens exactly but I have seen threads on here a few times where that was the issue. If your IDM is dry, then I would think it's good because they usually don't go bad with non use.

Leaving diesel fuel sitting in your tank for a while will clog some stuff. I've seen it happen a few times already. Have you confirmed that you have plenty of fuel in the fuel bowl?

 

Got AE Ford enhanced, it shows codes P1668,P1316,P1212, P1293 & P1294 .
battery voltage is 10.99 koeo. I didn't see buzz test, I'm going to have to read the book more.....

 

Sounds like a bad idm to me since you already checked out the harness. I would try to find a used one or someone with a 7.3 that would let you try theirs.

 

10.99 volts? Is that while cranking or just with the key on?

 

And with GPR operated or not?

Buzz test is under the "Test OnBoard Systems" tab.