1990 Cherokee 4.0 will not start - Pirate4x4.Com : 4x4 and Off-Road Forum

want2belifted · 01-30-2006, 09:34 PM

I just got this cherokee and have not had it running. My plan was to get the EFI parts off it to put in my 79 CJ (on a budget), but I would like to get it started first. I checked fuel pressure and distributor output which seemed fine. Not sure where to go next (used to carbs when everything was easy to diagnose, just hard to keep running when climbing). Any suggestions would be appreciated.

jeepin_psymon · 01-30-2006, 10:30 PM

if it jus cranks without firing. than unplug the crank positioning sensor then plug it back in. its located at the back of the engine on top and should have a three prong connector iirr.

sweetxj · 01-31-2006, 01:53 AM

is it an automatic. if it doesn't turn over, could be the neutral safty switch. i have a 93 cherokee and i have to move the shifter around. see if it helps if yo0u put it in neutral.

WildRide · 01-31-2006, 04:08 PM

I used to have one and had the same problem if I didn't run it on a regular basis. I was told that the fuel pump was going.

dram97 · 02-01-2006, 12:20 PM

Often this is the Crank Positioning switch.
It sits on top of the bell housing up against the engine.
it is about an $80 part but you can usually find them at the junkyard.
Should always have a spare if you are offroad....my friend's experience, unless you like being strapped back to town.

want2belifted · 02-03-2006, 10:12 PM

tried the unplug and re-plug the CPS, still not firing. Used starter fluid, and still nothing. I thought this was simple, compression, spark, flamable vapor, it should try to start????? Oh well, I may go ahead and replace the CPS. Its worth a try. Any more ideas?

01-30-2006, 09:34 PM	#1 (permalink)
want2belifted Registered User Join Date: Jan 2006 Member # 66472 Posts: 4	1990 Cherokee 4.0 will not start I just got this cherokee and have not had it running. My plan was to get the EFI parts off it to put in my 79 CJ (on a budget), but I would like to get it started first. I checked fuel pressure and distributor output which seemed fine. Not sure where to go next (used to carbs when everything was easy to diagnose, just hard to keep running when climbing). Any suggestions would be appreciated.

02-01-2006, 12:20 PM	#5 (permalink)
dram97 Registered User Join Date: Jan 2003 Member # 16256 Location: Glendora Ca Posts: 55	Often this is the Crank Positioning switch. It sits on top of the bell housing up against the engine. it is about an $80 part but you can usually find them at the junkyard. Should always have a spare if you are offroad....my friend's experience, unless you like being strapped back to town. __________________ [LIST] [COLOR="Blue"][B]82 CJ-5 - 4.0 upgrade 89 XJ parts 92 Cheyenne 3/4 tow[/B][/COLOR]

02-03-2006, 10:12 PM	#6 (permalink)
want2belifted Registered User Join Date: Jan 2006 Member # 66472 Posts: 4	tried the unplug and re-plug the CPS, still not firing. Used starter fluid, and still nothing. I thought this was simple, compression, spark, flamable vapor, it should try to start????? Oh well, I may go ahead and replace the CPS. Its worth a try. Any more ideas? __________________ [SIZE=1]want[/SIZE][SIZE=2]2[/SIZE][SIZE=3]be[/SIZE][SIZE=4]l[/SIZE][SIZE=5]if[/SIZE][SIZE=6]t[/SIZE][SIZE=7]ed[/SIZE] [SIZE=2]1979 CJ-7 and black hole for wallet[/SIZE]

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01-30-2006, 10:30 PM	#2 (permalink)
jeepin_psymon Registered User Join Date: Sep 2005 Member # 53333 Location: oregon Posts: 116	if it jus cranks without firing. than unplug the crank positioning sensor then plug it back in. its located at the back of the engine on top and should have a three prong connector iirr.

01-31-2006, 01:53 AM	#3 (permalink)
sweetxj Registered User Join Date: Sep 2005 Member # 54091 Location: outside of Peoria,Ill Posts: 1	is it an automatic. if it doesn't turn over, could be the neutral safty switch. i have a 93 cherokee and i have to move the shifter around. see if it helps if yo0u put it in neutral.

01-31-2006, 04:08 PM	#4 (permalink)
WildRide Registered User Join Date: Dec 2005 Member # 63703 Location: South Carolina Posts: 8	I used to have one and had the same problem if I didn't run it on a regular basis. I was told that the fuel pump was going.