MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

comanche misfire.

Old 05-01-2014, 08:04 PM
Junior Member
Thread Starter
angel1168's Avatar
Join Date: Oct 2012
Posts: 42
Default comanche misfire.

Alright guys. I dont post a lot due to I like figuring out things myself but this renix is killing me.The issue is with my 88 comanche i6 4.0. I have replace just about everything under the hood except actual engine and trans.. the issue Im having I have misfire on two cylinders. My uncle says that the issue is an electrical problem the big issue is that he is in Puerto Rico and Im in alabama so he is just talking based on symptoms i gave him and his 20+yrs of mechanical experience. I have replace the spark plugs about 3 times now. Ive check the c101 as well as other plugs wire grounds. starter been replace injectors are fine (have tested them twice).
the reason why he thinks is electrical is because the comanche wouldnt start for about a month, also there is no slap noise from the bottom end from when you break rod or wear out main bearing. I have been really busy so i hadnt had time to work on it. last weekend I went out side and jumped the starter now it cranks fine with the key sometimes (Im sure the ignition switch is bad). so what do you guys think can cause this Misfire ? I apologize for my english but it is my second language so if my grammer is bad please forgive me.

Last edited by angel1168; 05-01-2014 at 08:12 PM.
angel1168 is offline  
Old 05-01-2014, 10:12 PM
Junior Member
RusNorthID's Avatar
Join Date: Feb 2014
Location: Hayden ID
Posts: 62
Year: 1992
Model: Cherokee
Engine: 4.0L

Maybe i overlooked it but i didnt see you say anything about spark plug wires being replaced and ruled out as a issue
RusNorthID is offline  
Old 05-03-2014, 07:41 AM
Junior Member
Thread Starter
angel1168's Avatar
Join Date: Oct 2012
Posts: 42

I did change them. Is it normal for our computer to go bad and could that possibly cause it?
angel1168 is offline  
Old 05-14-2014, 11:42 AM
Junior Member
Thread Starter
angel1168's Avatar
Join Date: Oct 2012
Posts: 42

compression test results:
cylinder 1: 130
cylinder 2: 80
cylinder 3: 125
cylinder 4: 120
cylinder 5: 135
cylinder 6: 115

unable to do wet due to is started storming outside. i guess ill do leak-down test but i need to buy a leak-down tool.no longer thinking is electriacal but is still wierd that cyl 1 and 2 are not runnung but but one tested the highest any thoughts on what could probably be causing that could it be related to the low comp of cyl 2?
angel1168 is offline  
Related Topics
Thread Starter
Last Post
11-19-2015 11:49 AM
Vendor Showcase
09-24-2015 01:23 PM
MJ Comanche Tech. Stock & Modified.
09-08-2015 05:24 AM
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
08-28-2015 07:16 PM
Vendor Showcase
08-28-2015 12:28 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Search this Thread
Quick Reply: comanche misfire.

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: