hello i have an issue with my jeep starting then dies within 2 sec can stay running with starting fluid
i have 50psi fuel pressure with key on and while cranking
it fires really quick no long cranking
new fuel filter new fuel pump
mopar Crank position sensor new
cam sensor new
new cap rotor wires and plugs ngk coppers
new pcm
im out of ideas i have cleaned the grounds
i have 5v reference
cleaned the iac
injectors show 12.6 volts with key on
i really want to get this figured out before it goes to the shop on monday

 

Per, Your Mechanic (a webpage/site) - One of the most common symptoms of a bad ASD relay is an engine that will start, but stall out almost immediately, or at random times.

This would be a relatively simple thing to check. Just swap around/in a different relay (a/c or windshield wiper) for with the location of where the ASD relay goes. It would probably at least be worth checking.

The ASD (if the relay was going bad) would shut down the injectors and the ignition though, right? So, it should not run or stay running with the starter fluid?

What shuts down only the fueling? Security?

 

i have swapped the horn relay in for the asd same thing happens
i found a post saying ground out the purple with yellow tracer in the door so i did that still the same thing
also tried the key trick in all doors and the hatch

 

Not ASD relay, fuel pump relay! The ASD only controls ignition and injector circuits.

 

dave i have replaced both relays with new still same issue ugh im at a loss with this jeep i knew the deal was just to good to be true on this thing

 

Did your mechanic find the problem? I'm in the same boat you're in, exact same symptoms.

 

no after almost two weeks they are at a stand still the cam and crank sensor talk to the computer and sync till it starts then they desync and it dies

 

A short in the oxygen sensor circuitry can cause the crank sensor to [edited in].. act like it has failed, if there is a short in the wiring, or at the fuse box, and with the ASD.. O2 heater element.

Less likely, it could be an issue with a short in a part of the fueling circuit?

 

noah hard to say i looked over most of the wiring harness didnt see any major issues but could be a bad wire somewhere

 

Try the pick up coil, it's under the distributor cap, there is a wire attatched to it. It only takes a couple of minutes to pull out and replace; just unplug the harness and it lifts right out. Installation is the same in reverse.