Alright long story short. did a mud run, and the alternator quit charging. Jeep ran fine. Washed the motor, not a hitch or miss. So two days later I get around to replacing the alternator.

Replace it and now the jeep does not start. Spray starting fluid in the intake and it fires right up.

Fuel pump works fine. Plenty of pressure at the fuel rail.

Any clues? Thanks

 

Distributor is probably still wet.

Try to pull the cap off.

How charged is the battery?

Could be flooded. Will it start if you hold the throttle to the floor? (This shuts off the injector pulse)

 

Starts right up with eather.

Battery fine.

Wont start flored.

 

Hmmm, and you know that it's getting fuel?

Have you tested it with a gauge?

What year is it?


Edit: 98-01... hmmmm.

 

Could be CPS issue. If it's not cooperating the injectors may not be firing correctly.

Are you smelling gas at all while trying to start it?

 

The fuel rail bleed comes out forcefully. Its a 2000.

I imagine the crank sensor but why right at the moment I replaced the alternator is beyond me.

 

Yeah, that doesn't make much sense.

If you had a gauge it would be ideal to test it that way but if you're certain the PSI is good...

Got a CPS laying around? Maybe the mud damaged it.

 

I just picked one up at the zone. So we will see. Thanks for the help.

 

Alright, I replaced the cps, and no go.

Its has fuel pressure, it has spark, no start.


History:

ran it in mud.
Voltage meter went dead, but occaisionaly would pick up a little.

Battery was going dead. Drove it for a day.

Started running rough when battery went low(normal for a bad alternator)

Shut the motor off, tried to start it and it would not start.

replaced the alternator.

Now it still wont start.

replaced the cps, still wont start.

unplugged the computer and checked the fuse box. No water or anything anywhere.

either or gas poured into the throttle does start the motor.


And yes I disconnected the battery first.

 

From more reading it seems like it could be the cam sensor. Supposedly this fires the injectors.

 

Did you fully charge the battery with an external charger?

 

Not completely.


Its on charge now though.

 

You'd be suprised how a weak battery can keep it from starting. That's how I ended up with my XJ. Dude tried and tried to get it to run. It would spin over fast but it just wouldn't start.

I bought it and stuck a new battery in it and it's still running to this day.

 

However, with ether/starter fluid she fires right up, so that kinda goes against a battery issue (although load testing it will give you the def answer).
So verify fuelpressure with gauge.
It thats good, than it seems its kind of narrowed down to the part where the fuel doesnt reach the spark. So injectors malfunction/firing? Not much experience with those.

 

Thanks guys for the replies. I finally got it going.

Turns out the cam sensor was bad. Which controls the injector pulse. The sensor is not sealed and it allowed some mud to get in. It normally would not have hurt anything but the sensor magnet was about to fall out anyways. So the mud just finished it.