Need AE diagnostic help - IDM or injector or UVCH - Ford Powerstroke Diesel Forum
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Old 10-08-2013, 02:27 PM
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Need AE diagnostic help - IDM or injector or UVCH

Need some help with an AE diagnosis of an injector issue on my truck. As far as I know, injectors are original (253k), there is a LL in cylinder #8 and I have a blue CPS.

Hard start unplugged below 50 degs. In the previous few years I've replaced GPs and GPR with stancor.

When cold, it starts horribly and sounds like it has a miss for a few minutes then it warms and runs fine. I am pulling P0264 - Cyl #2 inj circuit low and P1274- Cyl #4 high to low side open. When it warms up, these codes go away. IR therm seems like drvr side is not warming like the pass side. SO thinking this pointed at the harnesses - I replaced UVCH and gasket on the driver side.

Still starts hard when cold.

Performed the IDM pin tests shown on the GB reman TB#103 http://www.gbreman.com/techbulletin_103.html- Test 1 results show all on left bank at 3.8, 3.2, 3.4, 3.8 and on the right bank 4.4, 5.1, 5.1, 20.5

Right bank power feed to Inj #7 Ground circuit shows 20.5 ohms, a much higher resistance - 20.5 ohms, between pins 24 and 20. The whole right side is higher than the test says all should be at b/w 2.8-3.6 ohms

Test 2 and Test 3 pass and are open.

I am replacing the harness and gasket on the passenger side, but am wondering if there is a way to confirm this isn't an injector issue with #7 while I have it opened up or a wiring issue between harness and IDM.

Thanks for the help,

Last edited by MtnOilRIG; 10-09-2013 at 05:32 AM.
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Old 10-08-2013, 09:30 PM
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I'm not positive on how to tell more since I have always been lucky and havent had to diagnose that far into an injector problem.

I can tell you though that you can replace the UVCH and start the truck with the valve cover off. It'll be just fine, I would do that inside though.
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Old 10-09-2013, 05:36 AM
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Thanks Schlutzer, will definitely start it prior to reinstalling everything.

I'm not smart enough to decipher this data, but I did some rotational velocity testing to see if I could tell which injector is acting up.

Cylinder 1 Cylinder 2 Cylinder 3 Cylinder 4 Cylinder 5 Cylinder 6 Cylinder 7 Cylinder 8
high ...0.2 .........6.1.........1.9..........0...........2.3 ..........0 ..........0.9 ..........18.8
med ...0 ..........0.05 ..........1............0..........1.45.........0.. ....... 0...........5.1
avg .....0.12......0.38........0.81.......0.00.......1 .12.......0.00........0.02.........3.74


Cylinder 2 would have higher % change right after pedal lift after a sustained 1500rpm hold for a few seconds. Thoughts.
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Old 10-09-2013, 08:03 AM
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Burning veggie...

Injector time my friend...
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Old 10-09-2013, 11:23 AM
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yeah yeah yeah - besides the obvious.


just making sure its not something else. I only have one new injector....where would you stick it? ahah
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