wont start still!!! - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > wont start still!!!

Light up the holidays with LED lights from JeepHutIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed LineRuffstuff Axle Simple Swap Kit!

Reply
Unread 06-29-2013, 07:05 PM   #1
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
wont start still!!!

I have an 89 Cherokee 4.0l. one day it was running just fine the next it just cranks but wont fire up. I have replaced fuel pump and filter, dizzy and roter and cap, plugs and wires, ICM and coil and the CPS. oh and the timing chain and gears. still nothing. I did a compression test and it was all outta wack so I pulled the head off and had it shaved and one valve seal fixed. put it all back together and its still doing the same thing it was before I started replacing stuff. please help im at wits end with this.

lance89xj is offline   Reply With Quote Quick reply to this message
Unread 06-29-2013, 08:03 PM   #2
tjwalker
It's the crank sensor!
 
tjwalker's Avatar
1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,516
You need to do some basic troubleshooting to see what you are missing. Fuel, spark and compression.

1. Do you have a strong, BLUE, snapping spark?

2. Do you have approximately 31 psi of fuel pressure at the fuel rail measured with a fuel pressure gauge?

3. What do you mean by the compression was out of whack? What were the "before" and "after" compression readings. The spec for the 4.0 is 120-150 psi, with no more than a 30 psi variation between cylinders.

Gotta start with the above three things.
__________________
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
tjwalker is offline   Reply With Quote Quick reply to this message
Unread 06-29-2013, 11:25 PM   #3
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
okay so I just cheaked the spark and its bright blue. and the compression is #1,80 #2,80 #3,75 #4,90 #5,95 #6,95. now im gonna run to the parts store to get a fuel presior tester.
lance89xj is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 12:28 AM   #4
Hudson
Registered User
1999 XJ Cherokee 
 
Join Date: Mar 2010
Location: New Milford, Connecticut
Posts: 785
Fuel is not your problem.


I mean it could be, but something is seriously wrong internally with that engine. None of those cylinders are within spec.

Did you do a wet compression test or dry? (Wet compression test is when you add oil to the cylinder to see if the rings(?) are sealing.)
__________________
Live To Die. You're Not Going To Get Out Of This One Alive.

Build Thread - http://www.ausjeepoffroad.com/forum/showthread.php?t=121903
Hudson is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 01:46 AM   #5
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
I did a dry test. and ill do the wet test tomorrow along with a fuel pressure test. It sounds like its super close to starting when I add fuel in the T.B. witch leads me to belive its a fuel problem.
lance89xj is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 01:51 AM   #6
xrunndonex
Registered User
1994 ZJ 
 
Join Date: Dec 2012
Location: coffeyville, Kansas
Posts: 1,796
hook up jumper cables and crank away don't crank to long and give it like minute breaks to recharge mine did that once turns out I got a battery with hardly a charge on it
xrunndonex is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 02:18 AM   #7
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
nope its not the battery.
lance89xj is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 02:19 PM   #8
Kalali
Registered User
2000 XJ Cherokee 
 
Join Date: Apr 2012
Location: Ocean, NJ
Posts: 547
What's the point in trying to start an engine with that much compression? You'll soon need to add a starter and battery to the list of parts that you'll be replacing. Isolate the cause of low compression between the valves and the rings and fix the root cause. How many miles on the rig?
Kalali is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 02:50 PM   #9
MarkwithaK
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2009
Location: Indiana
Posts: 74
My '98 did this when I first bought it. Ended up being the ignition coil.
MarkwithaK is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 05:01 PM   #10
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
there is 207XXX miles. its got a new battery when I bought it. and its got a new coil too. I guess I need to do a wet test and see if the rings are sealing or not
lance89xj is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 05:26 PM   #11
xrunndonex
Registered User
1994 ZJ 
 
Join Date: Dec 2012
Location: coffeyville, Kansas
Posts: 1,796
Quote:
Originally Posted by lance89xj View Post
there is 207XXX miles. its got a new battery when I bought it. and its got a new coil too. I guess I need to do a wet test and see if the rings are sealing or not
How many times have you tried to start it?
xrunndonex is offline   Reply With Quote Quick reply to this message
Unread 06-30-2013, 06:03 PM   #12
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,322
Sure seems as if some thorough diagnostics in the beginning woulda been good instead of shotgunning parts and stuff. Just sayin. I'm wondering if the cam is timed correctly.

This is a good lesson for others.
__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
cruiser54 is offline   Reply With Quote Quick reply to this message
Unread 07-01-2013, 05:49 AM   #13
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
Quote:
Originally Posted by xrunndonex View Post
How many times have you tried to start it?
probly 20 times or more.
lance89xj is offline   Reply With Quote Quick reply to this message
Unread 07-01-2013, 05:51 AM   #14
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
Quote:
Originally Posted by Kalali View Post
What's the point in trying to start an engine with that much compression? You'll soon need to add a starter and battery to the list of parts that you'll be replacing. Isolate the cause of low compression between the valves and the rings and fix the root cause. How many miles on the rig?
207700 miles on her
lance89xj is offline   Reply With Quote Quick reply to this message
Unread 07-03-2013, 05:13 PM   #15
lance89xj
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2013
Location: anchorage, Alaska
Posts: 32
Okay so due to everything being good except for the compression im going to replace the piston rings and inspect the lifters and camshaft now. keep yall updated
lance89xj is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.