New to Diesel Garage
Join Date: Aug 2009
Location: Los Banos, CA
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I'm leaning towards the IDM with these symptoms
I have a 2002 F350 7.3, Manual transmission, 4x4 ESOF, 198K Miles.
The truck has a very regular knocking and shaking at idle that stays constant as the throttle is depressed. The truch has no power. The Check engine light is not on, and I don't have any DTC's showing up.
The injector buzz tests completes without issue, and all 8 injectors sound good.
The cylinder contribution test consistently shows low contribution from Cylinders 1, 2, and 3. Occasionally Cylinder 4 shows up on there as well.
The problem onset all of the sudden. I replaced the driver's side (even number cylinders) UVC harness, and it made no difference. The old one didn't look bad.
Due to road closures, I was taking a very bumpy dirt/gravel road to and from work each day that is 10 miles long. I had been driving this route for a month. Often there was considerably sized puddles on the road.
Early on in diagnosis, the alternator went out, and the batteries were about due for replacement, so I replaced the alternator and both batteries. I fired up the truck and the problem went away for about 2-3 minutes, then started acting exactly as it had before.
Do you think it is a safe bet that I've condemned my IDM with this data? Has anyone ever seen one fail without giving the P1298 code?
Thanks in advance!