2002 7.3L Excursion
 

Chris,

I meant to say that before I took it apart it was intermittent. When I took it apart it was running on 4 cylinders (drivers side), and its still apart.

The resistances are consistent but do you think they're high?
Front GPlug GPlug 3.12 3.15 3.09 3.20 GPlug GPlug Back
Any ideas based on this?
I guess the injectors are OK?

Thanks, Sean.

When you're ohming the injectors, you're looking for one that's off from the rest. Yours are pretty close. It seems like the one I ran into read about 0.5 ohms off from the others. 3.xx are the most common readings on these injectors, but if you're looking for something to do, you could ohm the other side just for comparison purposes.

Chris,

No burnt pins/plugs.

I wonder if it could be the IDM or how you know if it is at fault?

Thanks, Sean.

If you're wanting the recommended test procedure to help narrow it down to wiring or IDM issues, look at this link. GB Remanufacturing - Tech Bulletin #103

Unfortunately, there's no magic test that says the IDM is bad (unless it's full of water or you pull it apart and see burnt pieces). All you can do is rule out other possibilities.

You might be able to narrow it down to which injector by checking for misfire codes.
P0300 is a general misfire
P0301 through P0308 lists which cylinder is misfiring.

Welcome back Dan.

Thank you, Chris.
Needed to take and FTE break for a while, was getting burned out.

Will have to try the Tech Bulletin tests for the IDM/harness/etc.
For codes I got P1316 and pending P0683, cleared them, then got codes P1316 and pending P0683 and P1247.
I have to go to California tomorrow, looks like rental car or flying!
Thanks very much, Sean.

To test the wiring (for the tech bulletin), is there any 'easy' way to get at the IDM? I tried to remove the inner (driver's side) fender liner and that's not working very well, Sean.

I had the SES light and that whole vehicle shake issue this last weekend. I read this post related to the quarter solution for the UVCH fix. Took it to my trusted diesel mechanic who confirmed that the drivers side back was bad (wires fried). Had to purchase new gasket and rewire harness for that. However the issue also affected the Injector Drive Modual, which had to be replaced. Holy cow is that thing expensive!! What exactly does it do? And it is normal for that IDM to go bad as a result of a fried harness connection? The truck has 200K on it, so I guess I can't complain too much, or can I?

The IDM(Injector Drive Module) is what sends the amplified output voltage to the solenoids of the injectors, so yes faulty wiring can and will cause issues.

Still haven’t found the problem, any other ideas?

I have this problem occurring again, after fixing it 2 years ago.

Here’s a summary:
- Running on only 4 cylinders (drivers side)

- Got P1316 and pending P0683, cleared them,
then got codes P1316 and pending P0683 and P1247.

- Connector at valve cover looks good, no burnt pins,
and resistances (passenger side) look OK:
Passenger: Front GPlug GPlug 3.12 3.15 3.09 3.20 GPlug GPlug Back

- Did all Tech Bulletin tests for the harness/connectors/injectors
All passed. Injector test reistances:
Passenger: Front 3.60 3.50 3.07 3.54 Back; cylinders 1 3 5 7
Driver: Front 3.35 3.19 3.20 3.28 Back; cylinders 2 4 6 8

I guess the injectors are OK? Do I just replace the IDM, hoping that’s it?

Any further help would be appreciated, thanks!

So the passenger side is dead, right? Unplug cylinder #5, clear codes, and start it back up. See if the passenger side starts working except for the #5 of course.

That injector is a bit off from the others. That could indicate a bad injector solenoid, which would cause the IDM to shut down the entire bank.

did shop make it worse?
 

2001 Excursion 7.3 bone stock 200k miles.

2 weeks ago, truck near home began to run really rough, no power. Wife limped home at 10 mph. When I got home from travel, inquired with her about maintenance done. (I'm not an Ogre, she insists it's "her truck only" until something which she doesn't want to mess with breaks). After much discussion, it had not had an oil change in 10K (on Amsoil). The fuel tank had 3 gallons in it. I immediately changed oil and fuel filter, filled with diesel with Lucas conditioner and Marvel. Truck ran like a 6000 lb. swiss watch. Problem solved???? Not quite.
3 days ago, leaving the house, the truck started fine but did not make the stop sign before rough running shaking, no power. I got home (I travel....a lot) Friday and limped it to what I thought was a reasonably competent small shop 2 miles from home.(I've used this shop for 10 years or so for simple items items I couldn't make time to do myself. Diff fluid change, tranny service, u-joints....) Before I went, I talked to the owner and asked as to which diagnostic tool he had and if he was at all familiar with the 7.3. He said he could scan it, and do a buzz test, and was very familiar with the UVCH problem. I dropped the truck off with instructions to run the tests and give me the results but to do no reapirs until I could evaluate the results. I went back the next afternoon to inquire about the results. He wasn't there, but his shop manager met with me.
Results were "Failed IDM, bad #8 injector, all glow plugs bad (note: never cold start problem or white smoke), bad VC gasket connections. Need to replace iDM, #8 inj, all GP (both sides) and both VC gskt." I asked him for codes and buzz test results. Answer "The mechanic didn't keep them, but Ive got you an estimate" $3000.00 right side, $5000 both sides. BS. To add injury to insult, I paid my $65.00 bill (for no damned results) and got in the truck to limp it home. No start, not even an attempt to fire. Plenty of cranking speed, tach needle moves when cranking, wait to start light works as normal. Went back inside and asked if they unplugged anything. "Nah dude, started fine for us, sorry it must have failed...." Towed truck home, nothing obvious. Unplugged ICP, no change.

I have 3 questions for the group.
What could they have unplugged to cause the no start? It started fine (just ran badly) before they "diagnosed" it.

Can an intermittent UVCH problem progress into a no start condition on it's own?

Is there a trustworthy Powerstroke shop in the Galveston County area?

Due to age and injury related medical issues, I'm fighting to even complete the GB 103. I'm not half bad on diagnosis (ASE Master 30 years ago, A&P, FAA licensed Avionics), I just don't have the body mechanics. Frustrating.

Thanks

additional info
 

codes I can get with ScanGauge II (KOEO, will not start)
P0674
P1316
P1280

PID 03 Loop is open

los = 37