[jbonfils]

I changes all my injectors, valve cover gaskets and UV wiring.I ran a contribution test with AE #1,#3,#5 and intermittent #7 fails test.

I have replaced wiring and gaskets twice checked to make sure all it clips and connections are tight. I am at a loss.

I unplugged wiring harness on that bank and the engine runs the same does not die or run any different.

 

[Excavator]

At this point you either have a bad IDM, bad harness from IDM to that bank or you could have a rare bad injector solenoid that could shut down that bank. Did this problem come after swaping injectors? If so I think you got one bad solenoid on injector. If problem was there before swapping injectors I say IDM. You could simply swap IDM with a another truck and see if all better

 

[jbonfils]

No I just had worn out injectors.

I ran a buzz test and all was good. Can you do that test and still have bad IDM?

 

[action4478]

No I just had worn out injectors.

I ran a buzz test and all was good. Can you do that test and still have bad IDM?

Back up a bit & tell us why you changed the injectors ,ect. in the first place...

 

[jbonfils]

When I replaced injectors and did buzz test two of them were off sounding so I replaced those two. Did buzz test again they sounded like the rest.

Should I take valve cover off and unplug each injector at a time to see if other four will come on. What should I do? Thanks.

 

[jbonfils]

Back up a bit & tell us why you changed the injectors ,ect. in the first place...

The truck was having a lot of trouble starting. Replaced glow plugs and relay which was bad still no help. Got an AE tester did buzz test 4 injectors were bad, contribution test showed #1 cylinder was faulting.

Changed all injectors and UCV gaskets and wiring. Did buzz test #5 cylinder was real weak and #7 was intermittent weak. Changed those two injectors and now #1,3,5,and 7 fault out during contribution test.

These injectors are rebuilds from Pensacola Diesel.

 

[Excavator]

If you have a bad injector solenoid it could indeed disable that bank. I have seen this myself. If valve covers are off disconnect one injector at a time and see if the other 3 come to life. You can than ohm that solenoid and see if out of spec. You can check a Solenoid with an OHM meter. A new Solenoid will show 3.2, whereas a used one will be between 2.9 and 3.2.

 

[jbonfils]

If you have a bad injector solenoid it could indeed disable that bank. I have seen this myself. If valve covers are off disconnect one injector at a time and see if the other 3 come to life. You can than ohm that solenoid and see if out of spec. You can check a Solenoid with an OHM meter. A new Solenoid will show 3.2, whereas a used one will be between 2.9 and 3.2.

And anything over 3.2 is bad?

 

[Excavator]

yes / you could ohm all 4 on that side and compare them.
As I said you might find the bad one and with it unhooked the other 3 might then fire up. This is a rare thing having solenoid go bad but I can send you a link to another thread that had this same problem and as last resort he ohmed the solenoids and sure enough 1 was bad and it disabled entire bank

 

[jbonfils]

I ohmed injectors and all were 3.0-3.2.

I am a little embarased but after the first injector change there was alot of oil on and around the engine so I took it to the car wash. I wonder If I got some water in the IDM making it not work. When water gets in is it toast or can you take the cover off and dry it off?

Where is the IDM,what does it look like, and how do I get it out? Thanks

 

[Excavator]

On drivers side fender / here a a pic
You can take it off and shake it and listen for water
Itdoes come apart after cutting seal/ look at other pics in link
dscf0005 pictures from rides photos on webshots

 

[jbonfils]

On drivers side fender / here a a pic
You can take it off and shake it and listen for water
Itdoes come apart after cutting seal/ look at other pics in link
dscf0005 pictures from rides photos on webshots

If it has water in it can I get some electrical contact cleaner and spray it down to dry it out ? Or will this mess it up farther? Any suggestions?

 

[jbonfils]

Took IDM apart no evidence of water hooked back up no change.

I am stumped.

 

[jbonfils]

bump.

 

[klhansen]

When you did the buzz test, did any codes come up?

If any did, they would lead you in the right direction. Your IDM could be bad even if it didn't get water in it, but usually AE will pick up IDM codes that would tell you what's up. If you took the IDM cover off, be sure to get it cleaned off well and use some ultra-silicone sealant to put the cover back on.

Another spot to look is where the main harness runs over the valve cover. If it's chafed and shorting, it'll be the injector circuits that are shorting out.

 

[jbonfils]

When you did the buzz test, did any codes come up?

If any did, they would lead you in the right direction. Your IDM could be bad even if it didn't get water in it, but usually AE will pick up IDM codes that would tell you what's up. If you took the IDM cover off, be sure to get it cleaned off well and use some ultra-silicone sealant to put the cover back on.

Another spot to look is where the main harness runs over the valve cover. If it's chafed and shorting, it'll be the injector circuits that are shorting out.

After plugging IDM in did buzz test all was good. Checked for codes none came up. The only time codes would come up was when trying to drive truck. The codes were all IPC related. Injector pressure would go as high as 1900psi at 3000rpms and have no power.

 

[jbonfils]

Bump.

 

[Excavator]

Have you checked the tin nut on the IPR?
If that is loose than the solenoid can move around when driving and cause havoc. Also check that harness connector that plugs into the IPR and the harness it self as well as the ICP harness connector and harness.
Did you ever try it with the ICP unplugged

 

[jbonfils]

Have you checked the tin nut on the IPR?
If that is loose than the solenoid can move around when driving and cause havoc. Also check that harness connector that plugs into the IPR and the harness it self as well as the ICP harness connector and harness.
Did you ever try it with the ICP unplugged

I had a extra ICP so I changed that sensor. The ICP pressure was a little higher after the change. I will check the tin nut and harness in the morning.

 

[jbonfils]

Have you checked the tin nut on the IPR?
If that is loose than the solenoid can move around when driving and cause havoc. Also check that harness connector that plugs into the IPR and the harness it self as well as the ICP harness connector and harness.
Did you ever try it with the ICP unplugged

The nut is tight on the IPR but there seems to be alot of play in the end of the conector where the wires go in. Also should the plastic connector that the plug goes into have a little play side to side?

I pulled the valve cover off also and unplugged each injector one by one and nothing noticable happened in the engine idle.

The truck idles ok but as soon as you push down on the throttle it hesitates and does not have any power.