x91evo

After a long and hard discussion on Naxja, I have found out nothing. So I will include a bunch of details so far of what I have done and come across.
2000 xj 175,000 Miles. Recently converted from 2wd to 4wd.
-49psi fuel pressure while cranking.
-New CrankPS
-New CamPS (installed when car was functional and is clocked correctly)
-New coils (for the hell of it)

Had a high RPM tire spin in 2WD (stuck in snowbank). Then when I let off the throttle the car died, and refused to start back up.
Car has previously stalled after a high RPM engine speed when I let off the throttle.
Also the car would not ever start on its first key on cycle, always the second.

Obviously this below diagram is wrong for a 2000..
But at Key on I am getting little voltage across the terminals in F18 and F21 positions.
What voltages should these fuses be seeing?

Here is what I came up with while comparing the fan relay pins
(last time I checked the fan worked)
Fan Relay ///ASD Relay
#86
key off- 0.000-0.002V ///0.000-0.003V
key on- 0.076-0.084V ///0.002-0.010V

#85
key off- 0.002V ///0.002V
key on- battery voltage ///battery voltage


I am thinking at key on for the ASD relay in pin #86 the voltage should be higher? Would this indicate a bad PCM?

x91evo

Forgot to mention..
It is a no spark issue.
Everything else is in operatable shape

x91evo

After reading every thread on here about a
"crank but no start"
I have come up with nothing.
Most people had the problem resolved by replacing the CrankPS.

Can somebody, anybody give me some insite please?
This is my only car and I am having a hard time getting around without it.

limited91xj

Is your new CrankPS Mopar? I

x91evo

Yup CrankPS is mopar,
CamPS (and synchonizer) are napa,
Ignition coils napa

Good idea though
Guessing all things point to PCM?

Willys55

have you tried jumping pin 30 and 87 to see if it starts/runs?

Parsnip

I've got a few ideas...
Check the power on those relays, is the fuel pump priming when key turn? Plugs gapped correctly? Dizzy looks up to spec? And last but not least I've had 2 friends that had a bad o2 that would cause high rpm to idle stalls, I'm assuming your in a 5 speed?

Parsnip

Also, will it start pedal to the floor? Or after doing a starting cycle with the pedal down? Did you modify your fuel injection at all? New throttle body even? I'm just pulling from what my friends had issues with

belvedere

O2 sensor will not cause a no-start, though.

Cherockee

Take a look here and follow through some of the videos, you never know what you might find

x91evo

Just tried it again, tried swapping around relays nothin.

Yea I can hear the pump prime.
Yup I double checked the plug gap.

Nope nothing other than OE.
Wont start at any throttle position.

I looked through the video, I am seeing the right amount of voltage at each. But do not have a scope where I can determine the wave pattern.

x91evo

Cleaned a few dirty pins on the PCM that I thought forsure might have caused my problem. But nope, no go.
I hate to say it but after a week of poking around and testing just about every sensor in the car, I think I am close to giving up

Parsnip

Hell maybe the ecm did give up the ghost...if not, they made return policy for a reason

x91evo

haha I am thinking this as well!
But local junkyards know better than to accept returns, and napa prices will probably be insane

Parsnip

I picked an pcm for my remix for 45 bucks worth a shot lol