Doorless jeep boys

Hey y'all I am new to the site and got a 90 xj 4.0 inl 6 it's the Amc motor I am trying to figure out what the possible causes are for it not starting I have all ready done the crank shaft postioning sensor in it and it still ain't starting I am getting good spark and fuel is the any possible way to read like a code off of it or anything thanks for all the help

91familyxj

So you are getting good fuel pressure?

Throttle Jockey

if you are getting good spark and good fuel supply, then that only leaves one thing. compression. how did you check for spark and fuel?

Doorless jeep boys

It just started it's running like it's outta of time it will start for like 2 sec then just die and runs really rough but it's not outta of time so it werid Any idea thanks

sportrider

got a timing light? also check the firing order maybe you've crossed plug wires.

Doorless jeep boys

Ok I will check that do you know where I can get the firing order at

91familyxj

1-5-3-6-2-4 Just remember the timing is fixed.

Doorless jeep boys

The firing order was correct I am still lost

OverlandZJ

When was it last tuned? Fuel filter?

If it's been awhile i'd pull some plugs and check them, see if the contacts on cap and rotor arent corroded.

A clogged catalytic convertor can make it run rough like that, but usually starts. Any noises from it recently?

bbbarker

Crank sensor went out on my '95, would sit there and turn over but never start. even with a new one some times the spacing isnt correct between the sensor and flywheel, just a suggestion.

Doorless jeep boys

I replaced that I think it's got be the distritbute pick up sensor

Doorless jeep boys

B

jeepfan93

I'd say maybe on the pick up. But you need to answer, how did you determine the fuel pressure? Really sure it's spark? Also you may want to get a noid light to make sure injectors are actually getting fire.

cherokee77

The truck will still run with the stator unplugged.
Mine did the same thing and it was the coil.



Edit: I see you say it has spark, nevermind coil.

How do you know it has fuel? Have you checked with a gauge?

88GTBlack

check distributor indexing. Should point just past cyl 1 at TDC if i remember correctly.