a good friend of mine has a 93 grand cherokee with the 4.0 litre engine and is having starting/running problems. he mentioned a while back the speedometer would work some days and not others...now it wont start.
we sprayed the throttle body and it will start so it seems it is getting no fuel
we checked the pressure in the fuel rail and it is getting proper pressure, and will re-pressurize when he turns the key so we feel the pump is working, filter is not clogged.
im thinking ECM. what do you guys think?
if it was one injector, wouldnt it just miss? misfire on a cylinder? none are firing.
would the ECM out of a 93 wrangler work to help troubleshoot?
any ideas? let me know
thanks