thanks for all your help, I will get the parts ordered from Riff Raff and hopefully that will fix it.
Thanks again
RB

 

I got my parts from Riff Raff and installed them this morning.
Bad news is that did not fix my problem. It is still running on 4 cyl. just like it was.
I had 1 battery with a dead short could that have fried the IDM?
Thanks RB

 

Is the IDM from Riff Raff ok to use ? It is not OEM.
I replaced the VC, and UVCH to OEM but it did not change anything.
Could a shorted out battery burn up the IDM?
Thanks RB

 

shorted battery don't usually take any thing out


Riff Raff sells good stuff IMO


Sounds like you have a bad wire in harness, OHM out the connector above to your injectors from feed to switched ground and report findings

 

Are you sure you didn't mix up any wires on the SD harness conversion? You wouldn't be the first guy to do that. You can use your DVOM to check that all the wires are hooked up properly. I was really hoping that would solve your issue.

Also, if know someone who would let you swap IDMs for testing that would go a long way.

I haven't looked at the riff raff idm, but any used OEM IDM 1994.5-2003 7.3 will work, probably a little cheaper.

 

I did not go with the SD wiring I stayed with the stock wires.
I do not know anyone with an IDM that I could borrow, Is there any way to test the IDM?

 

I did this the other day with the help of Cowmilker the ohms were the same at the IDM as they were at the Injectors. I wanted to change out the China wires for OEM and was hoping that would cure my problem.
I have changed the IDM out on this truck twice already in the last 10 yrs.
Thanks RB

 

Well, if you're sure that the wiring is good, and still only 1 bank is running, then that would seem to indicate a idm problem. There is probably an idm test procedure but i dont know.

 

not sure how handy you are but maybe you can measure the source voltage going to the injectors, if its not there then IDM is possibly bad based on your info. its also high DC volts of 110-140v depending on model.

 

Ok still trying to figure this out.
How would I go about measuring the source voltage to the injectors?
Thanks RB

 

Connect probe to ground and then other to center pin on injector harness. Should read 110 v DC. I have not tried it yet on mine but could tomorrow to confirm. Hopefully it isn't an isolated ground.

 

If you have time to try this that would be great, I hope to have time tonight to check it out. I would guess this test would be done with the key on?
Thanks RB

 

when running, not sure what IDM does with engine off key on


buzz test should tell you if its working or not

 

when you say running on 4 cylinders does it sound like this:

When i had this problem I went to a local diesel injection shop and had them run contribution test and buzz tests. the guy also told me its very rare for idm to go bad its 99% the wiring harness. I was lucky and was an injector pin. one cylinder goes a long way in sound of the engine and making power. I saw you took the connectors off one side and made a little difference to idle. I would take valve cover off, start it and wiggle the injector connections as you said China and Dorman. I had to get a small screw driver and pry the UVCH connection on to the injector so it would make contact. while your under the valve cover make sure the oil coming out of the injector drains look uniform. should be a little gush of oil after every fire.

 

Sorry I do not know how to do a buzz test.
I do not have a scanner and from what I could research I thought I would have to have one to do that, Is this correct?
thanks RB