Ok I am at my camp 2hrs from home and yesterday morning i took it down to the store and everything was good. came out of the store went to start truck and it was idleing really bad. drove it back to camp really slow. Only about a mile. start diagnosing and find out i am not getting any power to the injectors on drivers side. pulled whole wiring harness apart and nothing. tested for continuity for injector wires from the plug that connects to vc to the pin on the main harness by the fuse box and it was good. I had my brother bring me a pcm and idm from a buddies truck that runs and it didnt do anything. I also tested volts while cranking and on the pass side i had 2.5v on both plugs and 0v on the drivers side. I checked all fuses and tried swapping relays around and no change. I am at a loss here guys really dont want to have it towed 130 miles.

Any help would be greatly appreciated

Thank you, Shaun

 

Most likely an under valve cover harness is burned


On each valve cover connection there are five pins. The outermost pins (pins 1 & 5) are for the glowplugs. They should not have continuity with each other or the center three. The center three are for two of the injectors in each bank. The ohm reading between each outermost injector(pins 2 & 4) and the center pin (pin 3) should be about 3.2 ohms (if I remember correctly. Pins 2 & 4 should also not have continuity with each other.

 

I removed the vc and checked but everything looks good. I don't have power to the plug that gives the injectors power. The plug on the outside of the vc

 

Edit:

I see you tested everything that should cause this . Did you try your IDM in his truck?

Wires tested all the way back to the IDM?

 

Correct I swapped idm and exposed all the wires in the bundle and all look fine and tested them and were good

 

See if this helps

 

Ohm your injector solenoids at the VC plugs. See if any of the wiring going to the injectors reads too high or open. A bad injector solenoid can cause the IDM to shut down the entire bank. The bad solenoid I've seen only read about 1/2 an ohm different from all the good ones, but it was enough to shut down an entire bank. A new injector fixed it up.

 

You know I really didn't think it was an injector problem but I am going to.rule it out and ohm test them in the morning. Do you know how many ohms its suppose to have ? Thank you.

 

Should read less than 5 ohms, but the real key is to compare the numbers to each other. When I found the issue, 7 injectors ohmed within 0.1 of each other. The other was just over 0.5 off from the rest, but all were less than 4 ohms.

 

Ok good to know thanks for the info man.

 

Checking solenoid ohms:
Check at the solenoid.
Cross leads of multimeter, mine reads 0.4, yours may be something else.
Check ohms, mine will read 2.9 - 3.1. Any lower than 2.9 and the solenoid is usually bad.
If you cross leads and start with, say 0.0, then the lowest good reading you should see would be 2.5.
Make sense?
Good luck.

 

Yes it does and i am going to check that shortly and let you guys know what i find. I really hope this is all that it is.

Thanks jim

 

Ok just ohm tested all injectors with the tester on 200 when i cross the leads it reads .3 and all injectors read 3.0. so i am going to assume they are all good. I didnt check them right at the solenoid because i would have to remove them. is it still accurate checking from vc plugs ? Any other ideas for things to check? Is there anything under the dashboard that can cause no power to the injectors on drivers side. Glow plugs have power just not the injectors.

 

Have you done anything else to the truck lately? Anything seem unimportant or not related you're not telling us? We're either missing a piece to the puzzle, you tested something wrong, or we're down to testing the wiring between the PCM and IDM.

When you checked the wiring between the valve covers and IDM, how did you do it?

 

Well the most recent thing is the I have done is the t500 hpop. Had it on for about 1500 miles. I didn't check between the idm only between the vc plugs and the main disconnect next to.the fuse box under the hood I guess I will have to test from idm and see what I find out.
Also I checked it by unplugging the main harness and seeing if I had continuity between the main plug pin and the plug for the vc.