IISX 15 CM871 No Start

[hhow55]

Under symptom search in quickserve.cummins.com, you will see a list of potential issues that need to be checked.

[DVT873]

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Have you or somebody put a wrench on all the connections at the starter? The negative and positive posts are often used as a junction point for several wires. If nuts are loose, there will be problems. Not likely, but should be checked.

[DVT873]

(03-30-2026 )Livingston Trucking Wrote:  ...
" Insite shows engine state changed and synchronization"
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I've done a little digging and haven't found much solid information. No code doesn't help.

Can these engines go out of time? TLDR: The midrange International 466 engines can have this happen. A 5/32 dowel pin indexes the gear on the crank (press fit) that drives the entire gear train. Shock load can shear the pin, moving the timing. The result is exactly this. Won't cold start without a snort of bang juice. Once warmed up, it will restart fine for the rest of the day. It runs fine. Often, there is no code if it hasn't slipped much or is older with a less capable ECM. Rare problem that can be a real puzzle if you haven't seen it.

Not likely here either, but I don't know enough about the Cummins gear train to know if this is possible. Plus, how could changing the starter cause that?

[Rawze]

(05-13-2026 )DVT873 Wrote:  ...
Can these engines go out of time? TLDR: The midrange International 466 engines can have this happen. A 5/32 dowel pin indexes the gear on the crank (press fit) that drives the entire gear train. Shock load can shear the pin, moving the timing. The result is exactly this. Won't cold start without a snort of bang juice. Once warmed up, it will restart fine for the rest of the day. It runs fine. Often, there is no code if it hasn't slipped much or is older with a less capable ECM. Rare problem that can be a real puzzle if you haven't seen it.

Not likely here either, but I don't know enough about the Cummins gear train to know if this is possible. Plus, how could changing the starter cause that?

The ISX has crank and cam position sensors. It should be throwing occasional crank/cam position sensor fault(s) if the crank tone wheel has slipped... unless some idiot yahoo made a bad delete and blocked those faults.

on a CM871, a bad timing actuator can cause it to have hard starts too.. but both would have to be going bad + be in very bad shape I would think... but its not impossible.

Also,. come to think of it.. some people have made claims that the diaphragms on the back side of the IFSM, if they have gone bad, can make it hard start as described,. .. but I have never confirmed that.