[99x]

02 with a P1316 & P0267 Have replaced uvc harnesses,have checked injector resistance all are between 2.5 &3.1 ohm, check harness from idm to injectors for resistance and voltage drop all good. Got a rebuilt idm and have some problem. Am i missing something or do i have a bad idm? Any help would be great . Thanks

 

[ford_doctor]

Well lets see. New IDM, tested injector circuit 560 (LG/OG) and found no issues. What is left? Before condemning the injector I would do a couple more things.

Does the code return immediately or do you have to run the engine for a while? Does it repeat hot or cold? I am suggesting there that an injector or module concern can come and go with temperature and sometimes you have to perform your diagnostics by repeating the conditions that exist when the fault occurs.

The code P0675 means that the low side circuit for injector #6 is shorted to ground. Re-verify that the circuit is not grounded by disconnecting the IDM and measuring resistance between the injector circuit and the battery negative or engine ground. Move the harness, wiggle it, squeeze and bend it. Let the harness rest where it normally does. Inspect the engine harness for chafing and grounding where it drapes over the left hand valve cover. If you don't find an issue, the injector is suspect. You could try taking the old UVH and cut the wire ties and spread the wires to attempt swapping the #6 injector connector with #4 or #8, rerun KOEO injector electrical self test and see if that generates a new code for the appropriate cylinder. (I am not sure if the wires will reach but is a thought)


Keep in mind that injector coil resistance should test less than 2.0 ohms on a cold injector. Be sure to zero your meter leads before testing.

 

[Maryland dieselnick]

Morning doc, question; are you suggesting switching injector connectors to different injectors to see if code reappears?
Are you suggesting doing this during a non running electrical self test? Or running?

 

[99x]

It will start up smooth and in 10 to 15 sec it will go to missing. I have checked for wires to ground and they all check infinity.The testing is all on a cold engine.

 

[Maryland dieselnick]

Chose not to respond. I would never connect injector connectors to injectors they were not meant to be attached and try to start that engine.
If it were in my shop and you had shorts or opens, I would use a pin out diagram to identify all wires and ohm while giggling. I will not spend a lot of time messing with it. I pull that engine harness, degrease, open up and inspect and then put fresh tape on.
Funky IDM connection from corrosion, water or way too much dielectric grease on connector can give you this as well.
The valve cover is a chaffe spot.

 

[99x]

I have checked the harness for chaffing, all wires and convoluted tubing are in good shape,idm connections are clean and lightly greased(from the factoy).

 

[99x]

How reliable are the rebuilt idm"s?

 

[Maryland dieselnick]

I don't have problems with rebuilds.

This is what you want to see on good cold injectors. You may see about .2 variations but 3.2 across the board on cold good injectors is what you will see.

 

[Maryland dieselnick]

I'll go with .2-2.0 on a glow plug

 

[RT]

I'm sure FordDoctor was talking about swapping injector leads for a non-running test - like a buzz test. Since you say it takes running for 10-15 seconds to generate the code, what I would suggest is pulling the suspect injector's solenoid and swapping it with its neighbor to see if the code moves with the solenoid. What he's getting at is you may have a solenoid issue that is heat sensitive to some degree - in other words, it won't throw the code stone cold during a buzz test, but warm it up a bit and it will.

IDMs are very robust. It is unlikely that is the issue - more so since you had the issue before you replaced the IDM and it continues afterwards.

 

[ford_doctor]

I'm sure FordDoctor was talking about swapping injector leads for a non-running test - like a buzz test. Since you say it takes running for 10-15 seconds to generate the code, what I would suggest is pulling the suspect injector's solenoid and swapping it with its neighbor to see if the code moves with the solenoid. What he's getting at is you may have a solenoid issue that is heat sensitive to some degree - in other words, it won't throw the code stone cold during a buzz test, but warm it up a bit and it will.

IDMs are very robust. It is unlikely that is the issue - more so since you had the issue before you replaced the IDM and it continues afterwards.

That is correct.

 

[99x]

Will a bad coil shut down half of the idm?

 

[RT]

Absolutely. Usually on the same bank the bad coil is on.

 

[99x]

Thanks for all the help guys. My problem turned out to be a bad injector solenoid.Now she's up and running again.

 

[RT]

Great. Did you find a core or did you have to buy a new one?


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[99x]

I got one from a salvage yard, it ohmed out 3.0 and passed the buzz test.

 

[RT]

Good job!


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[Maryland dieselnick]

The coils can be purchased from Oregon Diesel.