1990 cherokee 4.0L starting problem - JeepForum.com
 
LinkBack Thread Tools
post #1 of 6 Old 08-14-2009, 09:20 AM Thread Starter
vintage_car
Registered User
 
Join Date: Aug 2007
Location: Nashvile
Posts: 49
1990 cherokee 4.0L starting problem

a few things have happened and no idea if any of this is related.

2 days ago, hard starting, that afternoon, it cranked but wouldn't fire. I sprayed some starter fluid in the throttle body and it fired up. Yesterday morning, it cranked but wouldn't fire. Starter fluid didn't help. Yesterday afternoon it did 2 things, cranked but would start, and then just a click no turning over. Waited a couple minutes and it would crank but not turn over.

I checked spark, there isn't any at the plug or the distributor.

Would a low battery allow for turning over but no spark? Not sure what to look at first.

vintage_car is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 08-14-2009, 11:15 AM
GeologistFelix
Registered User
1990 XJ Cherokee 
 
Join Date: Apr 2009
Location: Vashon, WA
Posts: 585
My guess is that it's a bad coil or a bad crank position sensor. The starter fails as a result of low voltage before the coil/distributor, I believe. The clicking was probably your starter solenoid, though, which means the starter wasn't getting enough juice, so a low battery could be contributing to all of this.
GeologistFelix is offline  
post #3 of 6 Old 08-14-2009, 11:56 AM Thread Starter
vintage_car
Registered User
 
Join Date: Aug 2007
Location: Nashvile
Posts: 49
replacing coil or CPS

how difficult is it to replace the coil and CPS?
vintage_car is offline  
post #4 of 6 Old 08-14-2009, 03:12 PM
GeologistFelix
Registered User
1990 XJ Cherokee 
 
Join Date: Apr 2009
Location: Vashon, WA
Posts: 585
Well, the CPS is a gigantic pain (note: I say that never having done it myself; just reading about it here on the forums), but the coil is pretty easy; you just have to move the wires and hoses out of your way and unbolt it, then put in the new one.

Probably good to disconnect the battery first, but that's all there really is to it, since it's right under the hood, not under anything large or difficult to move.
GeologistFelix is offline  
post #5 of 6 Old 08-14-2009, 08:07 PM Thread Starter
vintage_car
Registered User
 
Join Date: Aug 2007
Location: Nashvile
Posts: 49
cps did it

It was the crank position sensor. You are right it is a pita! 7/16th socket worked on the bottom bolt, I had to bend a 7/16 wrench to get to the top one, along with jamming my arm between the firewall and rear of the engine. Fired up after I was done.
vintage_car is offline  
post #6 of 6 Old 08-15-2009, 01:37 PM Thread Starter
vintage_car
Registered User
 
Join Date: Aug 2007
Location: Nashvile
Posts: 49
midfiring now

jeep ran great for about 20 miles and now it is shuttering with any sort of accelleration or even at idle. I'm assuming this shuttering feeling is misfiring. Would the CPS go bad that quick? I got this part from Auto Zone, has a 2 yr warranty. Can the CPS move at all and cause this problem?
vintage_car is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
1990 Jeep Cherokee Problem Florentine XJ Cherokee Technical Forum 10 07-14-2009 07:33 PM
1990 Jeep Cherokee AW4 Problem ridebmxfbm XJ Cherokee Technical Forum 43 01-13-2009 01:21 PM
1990 Jeep Cherokee Voltage/Stall Problem ridebmxfbm XJ Cherokee Technical Forum 5 04-01-2008 08:12 PM
Starting Circuit Electrical Fault in 1990 Cherokee emhunde XJ Cherokee Technical Forum 2 05-20-2007 05:34 PM
1990 cherokee not starting madsky1 XJ Cherokee Technical Forum 14 02-13-2007 07:01 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome