‘93 Pete 375 won’t start

Pull a valve cover, verify cam is rolling valves and injectors.

For whatever reason the injectors are not spraying fuel. That would be above my paygrade. Electronic engines are great until they're not!

Not sure about ISM, but had similar issue with ISX Cummins. Problem was the fuel shutoff solenoid.
That was about a dozen years ago, so going from memory. As I recall it was on left side of block towards the back, about level with the top of the frame.

Edited by truckerfarmer - 16 Sep 2021 at 9:11pm

99 ISM I believe will have just one timing sensor or engine position sensor Cummins calls it. It will be located on back side of frt cover left hand side, by air compressor. Those were common for going bad or losing connection at plug in. Later ISM used two sensors, one on crank and one on cam but I think 99 will just have one. Either way would be the first place to check, without a valid eng position signal the ECM will not fire injectors.

Yep! That's the one!

Order a new sensor Monday, you are beating a dead horse chasing signals.  This unit reads as a Hall Effect Switch, On/Off with a specifically different value for TDC.  They just fail.

Both previous replies are absolutely correct, Lol. Ohms test sensor but probably best to just get a new one, they are known for failing. And definitely check the terminals and wires on engine harness when unplugged from sensor just to make sure terminals look good and properly seated in connector body, check wires to make sure no breaks or rubbed thru, have seen all the above but most likely a bad sensor

Back probe connectors. Never poke a hole in the insulation! It will bite you or the next guy down the road.

Could be only 2 but if you have fuel out of pump the ecm has power from those fuses. Are there any check engine lights on? Without the ability to connect to the ecm there is no way to know what is going on

@Lars (wi); Have you tried disconnecting the batteries for a while and then reconnecting them and starting then? I worked on an N14 about that vintage that the Cummins dealer told me that sometimes the ECM's would go into "Hard Lock" mode for some reason. It worked on that one. Just a thought. 

Fuses are most likely fine, if they're blown then won't be any chk engine light at key on because ecm not getting power. As stated above if check eng and stop eng light on you're gonna need a way to read codes. There is actually a free diagnostic program from Cummins called power spec I believe but you'd still have to have a good laptop, cables and the adapter box.

Yeah that's gonna be your best next step. I'm surprised eng lights came on with fuses out, normally when ecm loses power feed they won't.

Frankenstein machines
Have had plenty of those thru the years.
Old gas powered converted to diesel or vs a vs, old tech engine power converted to later high tech and vs a vs.
Chip reprogrammed my own 7.3, helped others to add such to theirs.
Nowadays I work to destructure a emissions mess to what actually works well.

On a Side note, the RV industry is being granted a reprieve on engine auto shut down systems for such as DPF plugged up or DEF faults or even for faults that will place semis into limp mode in derate, this due to lack of knowledge on part of owners or RV techs as well parts(Chicom) to keep the rolling shathouses moving spending tourista dollars.

Hardly fair.

So this is not going to help anyone but just tell my story. I have a 07 INT with a C15 Acert. Went to leave one morning and engine would crank,crank,crank but no fire. WTH!! Called mechanic friend was ask if check engine stays on or goes off after switched on. It stayed on and he said you lost power to ecm. 2 hots and a ground from battery feed ecm and one of the hots had worn insulation which led to corrode through.  Totally diff scenerio I know