Random shut down

[Rawze]

robert3rekab Wrote:...
It has been 10 days now since I wrapped on the case of my ecm which did cause the truck to shut off and it hasn't restarted since. I just now tried spraying a little starter fluid and truck acts like it wants to start....just momentarily it runs. I assume this means my ecm is getting power, correct?
A stearlership in my area can get me a new ecm for $2,700 and $189 to program.

- Are you getting oil pressure (a few psi above zero) after several seconds of cranking in the dash?. If so then the ecm is not dead.

- Monitor the fuel pressure in insite while cranking. if you can, then the ecm is not dead. Fuel pressure must be above a certain psi before the engine will even try to open the injectors. On a CM871, that is roughly 60 psi minimum,.. but in all reality, mine gets above 100+ psi while cranking. It is not uncommon for the gear pump shaft on the 871's to snap internally ,and then the engine will not crank and run.. but it starts with ether, and shaft starts spinning just fast enough to keep it running sometimes.

- If the turbo is locked up at 100% closed, it will stumble a bit sometimes and then die. Making a 1/2" or so gap between the turbo and exhaust manifold will allow it to crank and run if its the turbo locked up.