suicidalpie

i have a 1990 jeep cherokee larado 4.0 inline 6

the starter was going bad so i replaced it and it ran no problem for 3 day. then i went to start to one morning and nothing. the temp gauge maxes out i can hear the fuel pump engage lights work. replaced the battery and the starter relay.

disguay

Check for corrosion on your battery terminals and follow the ground and power wires to where they attach to check for corrosion as well.

BimmerJeeper

No Start Checklist

NOT CRANKING

1. Check battery voltage (12V)
2. Clean/tighten battery terminals. (Loose and/or corroded?)
3. Check Gear Selector (Make sure you're in Park)
4. Neutral Safety Switch (Try to start in Neutral, not Park)
5. Check grounds
6. Is starter getting power? (With the key in the ON position, check for approximately full battery voltage at the starter.)
7. Starter (Hit with hammer)
8. Starter (Jump with screwdriver. Connect 2 highest bolts. 1 small. 1 big)
9. Starter Motor Fuse #19 (Kick panel: Fuse #19 (10A red))
10. Starter Motor Fuse #10 (Engine Bay Fuse Box (PDC). Fuse #10. See diagrams)
11. Starter Motor Relay (Engine Bay Fuse Box (PDC). “Cube” relay at end of fusebox)
12. Ignition Switch (Turn on the blower motor fan on for your heater with your key in the 'run' position. Turn the key to the 'start' position... the fan should turn off as it trys to crank over, indicating a good ignition switch.)

CRANKS, BUT NO START

1. Is gas tank empty?
2. Fuel pressure. 48psi (+/- 5psi). Listen for Fuel Pump?
3. Fuel pump relay (Engine Bay Fuse Box (PDC). Fuse #22. See diagrams)
4. Ignition fuse (Kick panel: Fuse #11 (20A))
5. Check for spark.
6. Bad spark plugs?
7. Bad Distributor, Cap, Wires?
8. Crank Position Sensor (CPS)
9. Bad coil pack?
10. Bad ECU?
11. Testing the TPS
12. IAC, TPS, CPK, MAP Failure Symptoms

Engine Bay Fuse Box (PDC)


Kick Panel Fusebox


Misc reading:
Replaced Crank Sensor, Pickup Coil, Spark Plugs, Wires, and Distributor Cap; unit still won’t start.

https://www.cherokeeforum.com/f2/non...writeup-71401/
https://www.cherokeeforum.com/f2/lon...8/#post2182489
http://www.jeepforum.com/forum/f11/p...l#post10006643
http://www.jeepforum.com/forum/f11/p...9/#post7683626
http://www.naxja.org/forum/showthread.php?t=101119
http://www.jeepforum.com/forum/f11/b.../#post14517948