Felt like it lost half the engine

[raydav]

2001 E350 cutaway PSD

Three times, a hundred miles, several days, and many stops between events. Suddenly lose power and check engine light comes on. Stop, shut off, restart, and all is well. No trouble logged.

I carry a spare PCM and IDM and the issue survived replacing both.

Is there anything that can be tripped and reset by rebooting?

 

[79jasper]

Yeah, likely shutting down one side of the engine.
I would bet your UVCH are bad.
Too bad you don't have a way to read the codes......

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[greenskeeper]

Yeah, likely shutting down one side of the engine.
I would bet your UVCH are bad.
Too bad you don't have a way to read the codes......

Sent from my SM-G892A using Tapatalk

agree. take off the oil cap and give a sniff....do you smell burnt wiring?

 

[79jasper]

http://www.gbreman.com/articles/?p=242
This can help also.

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[raydav]

2001 E350 PSD
Acquired in 2008
Removed fuel filter from engine. Have filters in front of and after pump on frame. Built regulated return fuel supply. 60# at regulator.
Replaced flex oil lines, added crossover line.
Shimmed and safety wired under valve connectors.
Added pigtails and re-bundled harness so that connectors can be brought out the front.
All that was completed several years ago.

Symptom: check engine light and serious loss of power.
Turn key off, restart, engine runs ok, light out.

It has now happened about six times, always on smooth road, no correlation with road shock.

P1316 IDM codes detected
KOEO: says fault must be present to be found. But engine is running OK at that point.
P0267 Cylinder 3 injector circuit low.
KOEO buzz
P0267 Cylinder 3 injector circuit low.
KOER balance
P0269 Cylinder 3 contrib/balance fault

And all that was with the engine running OK.

All injector resistance very consistent: 3.5 Ohm cold, 4.0 Ohm hot - just a random meter, nothing special

 

[compressionignitionrules]

any new developments or symptoms on your van yet? it did sound like one side under harness fail or intermittent disconnect.

 

[Macrobb]

Check the wiring harness where it goes over the valve cover on the driver's side. The harness can rub, wear through the paint on the cover and the insulation on the harness and produce an intermittant shutoff due to one injector wire shorting to ground.

 

[raydav]

any new developments or symptoms on your van yet? it did sound like one side under harness fail or intermittent disconnect.

No change yet.

Remember, this is a van. The engine harness connector is above the front edge and center of the engine. After the under valve cover connector issue a couple years ago I removed the engine harness, unwrapped it, and made individual runs from the harness connector to the individual destinations. I also lengthened the injector runs by replacing the original connectors with 6 inch pigtails. No wires do now or ever did cross a valve cover. I recently re-spliced one pigtail because a couple pieces of shrink tubing had "migrated", which left two bare splices that appeared they could have made contact. But no change. It has since faulted at least a couple times.

It acts as tho something is caused to latch open, and then returns to normal when the system is rebooted - engine turned off and restarted. Active short circuit protection on the injector driver outputs could do this, but no one I have communicated with says such a function exists - including those who repair IDMs.

I am going to isolate the wiring from the IDM to the engine connector, and the lines from the PCM to the IDM. If in that process I don't find anything to fix, I am going to put LEDs on the injector supply and return lines so I can watch those circuits in real time.

There is a lot of breakout equipment on eBay. But I do not know what is relevant for this vehicle. The component testing section of the wiring diagram does not cover the PCM or IDM.

 

[raydav]

Check the wiring harness where it goes over the valve cover on the driver's side. The harness can rub, wear through the paint on the cover and the insulation on the harness and produce an intermittant shutoff due to one injector wire shorting to ground.

See 2.26 post.

 

[greenskeeper]

IDMs are very robust unless they get water intrusion

The PCM will shut down an entire bank of injectors via the IDM if it senses a fault. Restarting can get everything working again until the next occurrence.

My money is still on something under the valve cover or the harness connections themselves

#3 is passenger side...i'd start there.

 

[raydav]

I see three lines from the PCM to the IDM - PCM pins 48, 95 and 96. Is the PCM able to sense a fault in the IDM output?

If the PCM can disable one bank until reboot, then I have found the latch I have been looking for. I have not so far found any internal info for either box.

Breakout boxes for 104 pin devices are available. I have not found anything for the IDM. It is a 38 pin connector but only 26 are populated.

 

[OLDBULL8]

UVCH check them.

 

[raydav]

UVCH check them.

Yes, we have had that discussion. But on a van that is major surgery, and it will need to get in line. I have ordered gaskets that do not have UVC connectors. I safety wired the current set.

 

[greenskeeper]

UVCH check them.

Agreed and mention in previous posts

Yes, we have had that discussion. But on a van that is major surgery, and it will need to get in line. I have ordered gaskets that do not have UVC connectors. I safety wired the current set.

Then I'm not sure what else to suggest. It's clearly sounds like the common under valve cover harness issue imho

I hope the gaskets you ordered aren't made by DORMAN

 

[raydav]

I hope the gaskets you ordered aren't made by DORMAN

No, they are APDTY, which I had never heard of. They cost half as much as Dorman. I have them, and so far am impressed. We will see how well they work.

I have used some Dorman stuff, not a lot. The only issue I recall was early Mustang upper control arm mount bolts I needed to replace because the supplied bolts were not long enough to accommodate shims.