More questions than answers part 1 million

[Ozymandias]

Well you would den start connect wire by wire back till it starts acting up again. Then proceed from there.

Problem is that these Stone age vehicles are very low if it comes to electronic diagnostic capabilities, they are dumb as a loaf of bread like we say and won't tell you what the issue is, they don't even give you a hint.

 

[SAndreasen]

Well you would den start connect wire by wire back till it starts acting up again. Then proceed from there.

Problem is that these Stone age vehicles are very low if it comes to electronic diagnostic capabilities, they are dumb as a loaf of bread like we say and won't tell you what the issue is, they don't even give you a hint.

I am hoping that between the new ecm and the new harness plug it will find the problem I did find a broken wire coming from the main harness to the pump connector now to chase that and see where the break is . I spent a 12 hour day chasing a broken wire in a 2014 kenworth one time keep opening harness and following the wire until you find the problem spent a solid week checking every single inch of wire and every connector and every relay in a brand new New holland skid loader had to prove to new holland that the main brain was in fact bad before they would authorize the 4000$ replacement brain . Sounds fun doesn’t it

 

[Topzide]

I spent a 12 hour day chasing a broken wire in a 2014 kenworth one time keep opening harness and following the wire until you find the problem spent a solid week checking every single inch of wire and every connector and every relay in a brand new New holland skid loader had to prove to new holland that the main brain was in fact bad before they would authorize the 4000$ replacement brain . Sounds fun doesn’t it

I think at that point, I'd have to get a wire tracer that tells you how far away the break is. At least that way, you'd have a narrower place to search for the break. I've used a "fox & hound" unit to search for wires on my truck. It helped me find the right harness split to open.

 

[petersonj]

Something is amiss...,

All that is needed to make this engine start and idle with a good injection pump is:

* uninterrupted solid fuel supply flow to the inlet of the VP44
* remote fused power to pin #7 on PSG
* remote ground to pin #6 on PSG
* VP44 drive gear in time
* air removed from injector lines

So, which one of these items is missing?

- John

 

[SAndreasen]

Something is amiss...,

All that is needed to make this engine start and idle with a good injection pump is:

* uninterrupted solid fuel supply flow to the inlet of the VP44
* remote fused power to pin #7 on PSG
* remote ground to pin #6 on PSG
* VP44 drive gear in time
* air removed from injector lines

So, which one of these items is missing?

- John

none of that is wrong so why won’t it run on its on fuel system but it will run on ether ? That’s the problem no one has an answer for as soon as I get another day to work on it I’ll hook up independent power and ground to the injection punp and see what happens

 

[Ozymandias]

none of that is wrong so why won’t it run on its on fuel system but it will run on ether ? That’s the problem no one has an answer for as soon as I get another day to work on it I’ll hook up independent power and ground to the injection punp and see what happens

No, it is not as long as your factory harness is connected to the VP44.

 

[SAndreasen]

I think at that point, I'd have to get a wire tracer that tells you how far away the break is. At least that way, you'd have a narrower place to search for the break. I've used a "fox & hound" unit to search for wires on my truck. It helped me find the right harness split to open.

I have a wire tracer but it’s not that great bought one with my power probe kit after watching what it can and can’t do you are better off with a multimeter and start opening harness and testing where you can

 

[SAndreasen]

No, it is not as long as your factory harness is connected to the VP44.

hopefully I can get back on to it again and hook up separate power and ground no other wires connected we can get something figured out

 

[SAndreasen]

How would the timing get off ? Is it possible to change the gear without removing the front cover ?

 

[SAndreasen]

Does a remote start system tie into the ecm or the pcm ?

 

[AH64ID]

Disconnect everything, literally everything, from the ECM then add + and -. If it idles start adding things back one by one.

 

[SAndreasen]

finally had to time to make a harness to supply power and ground only to the pump. The blue chip diagnostic book I printed off says that if it runs with power and ground but not with the harness hooked to the pump it’s a problem in the can buss wiring so now to reinstall the pump and see what happens

 

[SAndreasen]

 

[SAndreasen]

Got the pump reinstalled swapped the ecm with one from a running truck , decided might as well put a fuse in the hot wire of the test plug . Hopefully I can get back to the project and figure out something

 

[Topzide]

Way better to be safe, then sorry!

Fingers crossed for you in this battle!

 

[SAndreasen]

Way better to be safe, then sorry!

Fingers crossed for you in this battle!

I’ve never been into a 24 valve this far before . Normally If the pump doesn’t pump fuel it’s the pump . If I learned anything don’t assume it’s the pump

 

[SAndreasen]

View attachment 143093 View attachment 143092 I guess I’ve learned two things . Just because a pump won’t pump fuel doesn’t mean the pump is bad . The next thing is if you buy a pump buy one from someone who works on the trucks and knows the systems and has some background of the diagnostics on the pumps the cheapest price gets you just what you paid for .

 

[Ozymandias]

Attachments don't work.

 

[SAndreasen]

Attachments don't work.

Just a picture of the ecm that came off the engine . Cummins recon so someone has had issue previously .

 

[Topzide]

cheapest price gets you just what you paid for

So very true!