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mechanixrds · 04-05-2026, **(Subject: IISX 15 CM871 No Start )**

I once had an ISX 15 CM871 that was a crank no start after sitting for a while. The issue was present after sitting overnight. You could get it running on ether and be fine for the rest of the day. What I found on this one was the ECM. It was not supplying the right amount of voltage to the fuel shut off actuator. Check the voltage at the fuel shut off actuator to make sure you are getting 12 volts while cranking. If you don't, it will never start.

Livingston Trucking · 05-07-2026, **(Subject: IISX 15 CM871 No Start )**

Hey guys! I made a post a while back about my CM871 crank no start after a new starter was installed.

Got on here and tried a few things.

New gear pump & liftpump/checkvalve

Truck still will not fire without a shot of ether in the morning, runs and starts fine the rest of the day.

Shop I took it to is stumped, told me they cannot figure the issue out. This truck is driving me nuts.

I am not sure what else to do.

The shop claims it has proper fuel pressure and checked all the fuel lines. Check all fuses and electrical etc.

I am not sure what to do from here. I just want to get this truck to fire on its own and sell it. Its been a total nightmare.

mikkhh · 05-07-2026, **(Subject: IISX 15 CM871 No Start )**

Hard to find good shops nowadays.

Best is to fix it yourself. The guy fixing it usually has even less clue than the guy driving.

How was the fuel pressure checked? How is the blowby?

Truck has all the mandated on it still?

marek4792 · 05-07-2026, **(Subject: IISX 15 CM871 No Start )**

If you have a davco 382, have you checked the check-ball at the inlet?

Livingston Trucking · 05-07-2026, **(Subject: IISX 15 CM871 No Start )**

Update on this truck. Got it back from the shop today, now after I shut the key off, it runs for about 8 seconds after removing key totally. Does not stumble or miss at all, runs fine just takes 8 seconds after keys shut off to shut down?

What the heck is this thing doing.

Yes it's d3mandated

No this unit does not have the davco 382

mikkhh · 05-08-2026, **(Subject: IISX 15 CM871 No Start )**

Deman has been checked over? Maybe somebody deleted just a bunch of fault codes?

What about the fuel shut off solenoid? Has it been changed or checked?

Rawze · 05-08-2026, **(Subject: IISX 15 CM871 No Start )**

(05-07-2026 )Livingston Trucking Wrote: Update on this truck. Got it back from the shop today, now after I shut the key off, it runs for about 8 seconds after removing key totally. Does not stumble or miss at all, runs fine just takes 8 seconds after keys shut off to shut down?

What the heck is this thing doing.

Yes it's d3mandated

No this unit does not have the davco 382

First and foremost, copy the program from the ecm and e-mail it to me for a review of what someone did in there. - You don;t know if the program might be part of the issues at this point, and besides that, it could be causing internal damage to the engine over time. Most delete programs are quite bad and do progressive damage over time, leading to premature turbo and major engine failures prematurely.

Next: - If the engine does not turn off for several seconds like you describe, it takes 2 component failure problems for that to occur. I have seen this many times,... and if your mechanic shop/ friend there does not know this then you need to seriously find someone more knowledgeable to work on that truck.

Matter of fact,.. that is likely WHY you have so many issues with the engine. - CLUELESS MECHANICS!!!... which nowadays is an absolute plague any more especially on red engines.

DO you think that if I owned it, that it would have any of those issues?> ... NOPE!.

Any-how,... for it to stay running for several seconds like you describe ... There are 2 (two) issues going on ...

#1. Someone had to have removed the guts from the fuel shutoff solenoid. That or it is stuck in the open state.

- This by itself however will not make it keep running like that,.. the engine would still shut off right away. It is only half of the reason for prolonged idle after key-off. There is nothing wrong with removing the guts of the fuel shut-off solenoid for troubleshooting, etc.. this hurts nothing, especially to help solve starting issues, etc.. but the mechanic should have seen right away the delayed shut-down problem that followed it.

#2. The second thing that has to have issues to keep it running after key-off is a very leaky fueling solenoid. One or more of the fueling solenoids has to be very leaky for it to keep running like that.. and that is revealing a fueling system issue.

Someone needs to adjust the overhead valves properly and then do an injector leak test on it. - Make sure it passes with flying colors, that there are no bubbles, etc.
here is info on how to do this properly on a CM870/CM871...
https://rawze.com/forums/showthread.php?...8#pid67948

Matter of fact, did anyone adjust the overhead valves when they changed the starter>?>.. maybe they did it wrong and now, which can cause hard start issues if it was done improperly.

NEXT: You did mention that the ecm was not showing the 'cranking' in the data monitoring properly while cranking. Like has been mentioned... have the programming copied out and e-mailed off to me and checked as well.

- Worse case scenario.. you can make an appointment with Mr. Haggai's down here in griffin, GA. - Might be a long ride to get there, but they would certainly get to the bottom of its issues.
info: https://rawze.com/forums/showthread.php?...5#pid69605

Livingston Trucking · 05-08-2026, **(Subject: IISX 15 CM871 No Start )**

Thanks for the reply guys!

So my main shop was 3 weeks out at the time of the starter. I needed it done ASAP so they recommended the local MHC KW dealer. Brought it for just a starter, left with the issue of no start without ether.

Took it back last week for them to fix the issue, they just gave up and washed there hands said they couldn't figure it out. Replaced gear pump etc. Still an issue. Brought it home yesterday to a new issue, runs 8 seconds or so after keys removed, runs smooth no roughness at all.

In there diag sheet it says they did mess with the fuel shutoff solenoid so I do suspect that.

Rawze as far as sending you my programming, I'm not 100% sure how to go about that. I am new to this and learning much as I can as I go. I do not have personal access to insite. However I do have a good friend that does have it. If you could step me through how to do this, I'm sure he'd have no problem letting me use his equipment to read and send me programming.

I have attached below there diag sheet for this truck (stuff blacked out is unrelated to the fueling issue)

Livingston Trucking · 05-08-2026, **(Subject: IISX 15 CM871 No Start )**

(05-08-2026 )Livingston Trucking Wrote: Thanks for the reply guys!

So my main shop was 3 weeks out at the time of the starter. I needed it done ASAP so they recommended the local MHC KW dealer. Brought it for just a starter, left with the issue of no start without ether.

Took it back last week for them to fix the issue, they just gave up and washed there hands said they couldn't figure it out. Replaced gear pump etc. Still an issue. Brought it home yesterday to a new issue, runs 8 seconds or so after keys removed, runs smooth no roughness at all.

In there diag sheet it says they did mess with the fuel shutoff solenoid so I do suspect that.

Rawze as far as sending you my programming, I'm not 100% sure how to go about that. I am new to this and learning much as I can as I go. I do not have personal access to insite. However I do have a good friend that does have it. If you could step me through how to do this, I'm sure he'd have no problem letting me use his equipment to read and send me programming.

I have attached below there diag sheet for this truck (stuff blacked out is unrelated to the fueling issue)

Here is there Diag sheet