08-14-2016, 04:53 PM
Join Date: Aug 2016
Injector Grounding through ECM?
HI I was over on a jeep forum but no one really seams to know anything about a Hemi over there.
so I just got a 05 grand cherokee limited hemi 4x4 168k miles, it has a engine problem.
p0300 multiple cylinder misfire
p0308 cylinder 8 misfire
p0520 engine oil pressure sensor out of range
p0208 injector 1,2,3,4,5,6,7, or 8 control
p2302 ignition coil No 1 secondary circuit insufficient ionization
I have replaced plugs, wires, coil packs, pulled valve cover to inspect springs and everything, did a compression test. Nothing mechanical that I can find is wrong.
#8 plugs were dark and wet with some oil when I pulled them.
After probing around with multimeter I am showing that #8 injecter ground (to pcm) is just ground and not pulsing.
It is just showing 12v through it all the time.(constant spray) The other injectors do not do that, they bounce around on the mulitmeter (as they fire)
It runs rough and when I unplug #8 injector the idle does not change. (100% fuel to 0% fuel) I thought it would change the idle.
Is this a bad ecm?