60 series Detroit won’t start

Thats the only other thing if fuel and compression are present.

I thought fuel check valve, but he said fuel is running.

Check ECM plug, wiring, power to ECM. Worst case swap out ECM with loaner?

 

One keeps it running, the other prevents startup? I can never remember.

 

Only srs will stop starting. But I normally change both if your doing one. The lower trs won't do anything without a hard electrical fault. Bottom is a "here it comes" top is " there it went". Bottom isn't really even needed.

 

Yep they are much simpler than most made them out to be. Still alot mechanical with electronic controlled injection and monitoring.

 

should fire on starter fluid unless the motor has bent valves

 

Wtf are you taking about?

 

You can start a engine on starter fluid it will fire if it don't fire at all it's f###up wont run long no but will start

 

No. ECM replacement is literally THE last component to point a finger at. Its probably the most reliable part on the truck.

Don't those injectors run at something like 120 volts? Versus chassis 12 volt?

Does the ECM have good ground connections? Power is only half the equation.

If the ECM isn't seeing all the info it needs (usually key power, constant power, RPM/engine position) it will not send any signal to the injectors.

Exhaust all options before putting suspicion on the ECM. Well over half of all ECMs replaced were replaced for no reason other than someone jumped the gun on proper diagnosis.