n14 misfire under load and at hot idle

RealCrizy · May 11, 2023

bravoo67 said: ↑

Check all the ground connections for rust, maybe fuel pressure or air in the fuel, maybe harness- check with NOID light if there is enough continuity between injectors and ECM, saw injectors good at idle but when go over some rpm they start to miss, make sure ecm gets enough power from batteries, maybe the steering wheel switch is bad but dont think so, check if fuel shut off valve/solenoid getting enough power, maybe clogged cooling plate behind ECM or valve on that plate blocked by debris, maybe clogged small fuel filter on the fuel pump, new engine harness, in my case turned out to be ECM when getting hot started to miss at idle, nothing under load or cold. I would get new ECM or take old one to some electronics repair place and tell them to check electronic parts for being loose, burned or simply broken circuits in between this components. After so many years on the road this ECMs get destroyed because of all this bumps and holes in the road. Till this day no problems since and getting over 7 mpg. Good luck!
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Thankyou for your feedback
I already bypassed cooling plate changed pump/lines and harness so am aiming towards an ecm still not 100% sure. I do have a leak in the return line tho.
I hooked the old eps back up and ran a lil better I believe I bought 2 failed ones.

Zethull · Mar 5, 2024

RealCrizy said: ↑

Thankyou for your feedback
I already bypassed cooling plate changed pump/lines and harness so am aiming towards an ecm still not 100% sure. I do have a leak in the return line tho.
I hooked the old eps back up and ran a lil better I believe I bought 2 failed ones.
Click to expand...

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