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I have an M936A2 that when I start it pegs the voltmeter for exactly 5 minutes then drops down to normal. I have measured with a voltmeter to confirm and it goes to ~34 volts for the 5 minutes then drops back to ~25. When I got the truck the wire to the alternator was disconnected and now I...

My main problem I am fighting right now is a below 1000 rpm wanting to die and idle issue that is detailed in another thread and I am slowly getting better with some work and fuel system fixes/replacements. I have a hard time getting into reverse or forward without killing it or getting it...

This truck is new to me so I have been going over things and found some disconnected steel lines and a disconnected wire on the transmission. Wonder if anyone can help me identify these and why they might be disconnected. Here are some pictures of the steel line And here is a picture of...

Mine does not auto-throttle up. I have to manually adjust it with the hand throttle.

Not really sure what you mean by power divider. At high idle it runs fine. It does not seem to handle load as well. For example in neutral transfer case in gear for the transmission with PTO locked in I can kill it at low idle very easy. Have to rev up over 1000RPM to not kill it.

I had a hard time finding the FG cummins cleaner so I was able to get some Penray Total Diesel Fuel System Cleaner off amazon and from what I read it is really good at cleaning up deposits, especially asphaltene. It seems to have helped. I dosed it pretty heavy in the tank and ran it for an...

Biodiesel sounds like an easy try. What causes it to clean things up. The fuel had a heavy varnish smell when I drained it. I smelled no hint of vegetable oil and I'm familiar with the smell of it as it goes bad. The varnish smell did have a slight sweet smell so I could buy into the sugar...

WillWagner thanks and I will try your suggestions. I thought I should include a picture of the spin on fuel filter I removed to give an idea of the buildup I am seeing. And the sludge/tar I drained out of the fuel tank after the E85 soak.

Brand new

Yes the lift pump was brand new. I would hate to count how many times I've pushed the prime button on the lift pump during all of this.

Well that is an interesting question. This lift pump just had a bolt in the spot were the fuel sensor went. It apparently had it removed at some point.

I don't have any way to do that. I could probably remove them and take them somewhere to test.

I have completely eliminated everything to the injector pump including the lift pump and all hoses by temporarily taking a new line from the lift pump to the tank through the fill hole in the tank.

I have a 1991 M936A2 that I recently acquired. I bought it knowing it had an issue running correctly. It will start only when given a little accelerator. It will only run from about 800 rpm up. From there it seems to run fine. Below that it stumbles and dies. If you let it idle down to...