Overshimming injectors will cause a p1316.

 

I only had to shim 3 injectors. Two I shimmed .001 and one at .002. I used my own gauge and made sure wasn't over .004... Been trying to get in touch with Bitterroot since that is where I purchased the rebuild kit. But I can pull #4 and double check. That is after I check the harnesses, because I had a P1316 prior to shimming.

 

Didn't realize you had p1316 prior to shimming. It's probably something else then. I had p1316 show up after shimming diy rebuilds.

 

Well I'm thinking and hoping it is my injector harnesses. One of the injectors on pass side was odd. Gauge slid easy on one side but tight on other.

 

Ok, I'm getting 3.5ohm on driver side and pass side from 42 pin location. I don't understand this. Higher than 3 ohms, so does that mean bad harnesses?

 

I thought the spec was 2.8-3.5. I may not be exactly right but I'm sure that's close, and I don't see a couple tenths of an ohm making any real difference. I'm pretty sure it's more important that they're all fairly uniform. Like I said before testing it that way it's only verifying from the plug to the injector everything from the plug back towards the IDM is anyone's guess. Could also be an IDM fault as well.

 

Just read tech spec, says 2.8 - 3.6 ohms. So in morning I'll open the valve covers and take a peek. Bought two new harnesses. Can basically tear down the top of my engine blindfolded at this point. Hopefully it isn't my IDM. BLAH... Well once I do more checks and test I'll let you know.

 

Morning update, took cover off and all connector are attached. Took out harness and then used pigtail to ohm each injector at solenoid. Resistance was 3.2 ohms at each injector. Then tested from 42pin back to IDM and got OL on each pin for injectors. Checked all wiring for chaffing and didn't spot any. So going to put in NEW harness that is an actual Ford harness and see what happens. If there is anything else that anyone thinks I've missed then don't hesitate to let me know please.
Oh, quick question, should I go ahead and replace main pigtail that plugs into harness or leave original in place?

 

I'm not sure multi meter testing it from the heads back to the IDM works. It's the IDM completing the circut allowing the solenoid to fire. Maybe if the engine was cranking but I imagine the siginal happens so fast a multimeter wouldn't be able to register it. Maybe with an oscilloscope but I wouldn't have any idea how to rig that up.

 

Ok here I am again scratching my head out confusion 😕. Ran a FORscan and got a P1316 P1298. Both seem to be pointing at IDM. Especially when it said internal fault at IDM.
Ordered new (reman) and am about to put it in. Used multimeter to test from IDM to injectors. Reading 3.3 ohms on everyone. Read the attached doc and I see something about 2.9ohms. But the scale is saying 2.8 - 3.6ohms. What am I suppose to be getting?

 

I checked the PC/ED volume of the Ford Service Manual and your right, the P1316 and P1298 are referring to the IDM.

The tech bulletin states: Nominal solenoid resistance for Powerstroke injectors is 2.9 ohms.

The tech bulletin states: All circuits 2.8 - 3.6 ohms.

Your reading of "3.3 ohms" appears to be within the "acceptable range" as described by the tech bulletin.

Based on how I am digesting your readings and the parameters presented by the Tech bulletin, the injectors are within operating specifications and the IDM should be the focus of the DTC's.

I have attached the IDM pinpoint test from the PC/ED volume and the tech bulletin I have on file, which is identical to yours, but a different company.

 

I had used a pigtail and had prior tested all 8 injectors at the solenoid and got 3.0 ohms on all. The initial P1316 stated possible electrical fault or Fuel delivery system. While driving earlier today (had no choice) on the interstate I was running at 75mph and truck started jerking like was starving of diesel. But RPMs didn't change or anything else on gauge. Got off interstate and engine idled normally. No smoke or anything. Got back on interstate and never happened again. Got home and pulled fuel bowl cap and all is clean. After replacing IDM (from Diesel Power) I ran all test. Initially had P1316 even though had disconnected batteries which usually clears computer. So cleared DTC and deleted logs. Ran test again through FORScan and only thing I'm getting is overhead compass fault (it's been dead), EBP sensor (deleted that a while back) and a P1000 (no clue on that). Currently waiting for new fan clutch since mine is no longer free spinning when engine is cold. Still seem to have a long start. Not sure if clutch might be causing since it puts resistance on engine. I'll look over what you sent and see if anything gives any ideas. But currently no P1316 or P1298

Where is this 361 (W/LB) and 814 (W/BK)? Yes I'm clueless. LOL

 

My apologies, I thought you were concerned about your observed readings and was attempting to assure you they were within the parameters noted in the bulletin.

361 and 814 are circuit numbers if memory serves me correctly. Without looking at the IDM pinout or wiring diagrams, I cannot say for sure. I will look in the morning though and let you know.

W/LB and W/BK are the wires primary and secondary colors.

 

NO NO, no need to apologize. I appreciate any advice and that you settled my mind about my reading on the resistance test.. I think I was just reading to much into the tech bulletin and that is what was confusing me. Yes any help is very appreciated and I'm electrically challenged but can teardown this engine blindfolded at this point. LOL

 

Sounding like you might have her licked at last. That P1000 is just a codes cleared code, I'm guessing it's some kind of flag for the techs to know previous code were cleared.