Timing issue - 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 Wrangler Forums > YJ Wrangler Technical Forum > Timing issue

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSavvy Billet LED Tail LightsLight up the holidays with LED lights from JeepHut

Reply
Unread 01-19-2014, 01:45 PM   #1
Sgtrhoads
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Watertown, New York
Posts: 25
Timing issue

I am having a hell of a time getting my rebuilt 95 4.0L to start. I rebuilt it before I deployed last year and have just got back home to work on it again. I have timed the cam multiple times. The new chain set I received is a 64 pin set. I can't find the old one to see if it was 64 or 48 pins. I have check the distributor timing many times as well. It is continually back firing through the throttle body. I can't seem to figure this out. Any help would be greatly appreciated!!

Sgtrhoads is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 02:07 PM   #2
Mark05059
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,379
lets start at finding TDC on the intake stroke.. pull #1 plug wire. Turn the crank over using the crank bolt at the front of the motor while sticking your thumb over the hole.. When you feel pressure on it stop and put something skinny and long (screw driver, wooden dowel) into the spark plug hole and turn slowly till it stops moving. Remove the cap and see if the rotor is pointing at #1 on the cap. If it all looks correct then you may have to double check your timing marks.
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Mark05059 is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 02:21 PM   #3
GrEmLiN
Registered User
1987 YJ Wrangler 
 
Join Date: Feb 2008
Location: Southwest, Connecticut
Posts: 128
Mark beat me to the punch. Couldn't have said it better.

Verify TDC before anything else. If that checks out, check timing marks. Somethings not right.
GrEmLiN is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 02:25 PM   #4
Sgtrhoads
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Watertown, New York
Posts: 25
I verified TDC when installed the timing set. The book states 15 pins from mark to mark when the cam timing pin is at the 2 o'clock position. This is for a 48 pin chain, where I have a 64 pin chain so the check doesn't work. With the #1 at TDC, the timing marks point at each other. The distributor rotor is pointing at the #1 cap point. Just to verify, the #1 should be at 5 o'clock when standing on the passenger side of the engine, correct?
Sgtrhoads is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 02:52 PM   #5
jsawduste
Web Wheeler
2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,042
180 off. Turn the crank 1 revolution and reinstall distributor.
jsawduste is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 04:17 PM   #6
Sgtrhoads
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Watertown, New York
Posts: 25
When I did the the rotor points at the #6 firing position when at TDC.
Sgtrhoads is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 04:18 PM   #7
Sgtrhoads
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Watertown, New York
Posts: 25
Does anyone know the correct timing chain for a 1995 4.0L? Either 64 or 48 pin chain
Sgtrhoads is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 04:48 PM   #8
jsawduste
Web Wheeler
2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,042
Quote:
Originally Posted by Sgtrhoads View Post
When I did the the rotor points at the #6 firing position when at TDC.
As it should have. Now move the dist. back to #1 without touching the crankshaft. Turn key and hear engine run.

Guessing you have the plug wires arranged in the firing order, correct ?
jsawduste is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 05:00 PM   #9
Sgtrhoads
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Watertown, New York
Posts: 25
I do but you have me confused. I can't turn the distributor due to the mount bracket. It can only go in one way
Sgtrhoads is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 05:13 PM   #10
jsawduste
Web Wheeler
2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,042
Take the hold down off. Raise up dizzy and rotate the rotor back to #1 firing position. Lower dizzy and tighten hold down. Remember the cam gear is helical cut so as you raise and lower the rotor will turn a touch.
jsawduste is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 05:42 PM   #11
Mark05059
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,379
or you can cheat just to be sure without removing the distributor.. Put #1 plug wire where the rotor points (#6 hole) and finish the firing order.. the motor should run.. when
it does then your 180 out and should move the distributor to the correct position
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Mark05059 is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 06:24 PM   #12
jsawduste
Web Wheeler
2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,042
Indeed Mark but I did not want to add any more confusion.

If the 180 doesn't work then I`ll bet he is a tooth off cause of the rotation when the dist. gets dropped back in. Happens to all of us.
jsawduste is offline   Reply With Quote Quick reply to this message
Unread 01-19-2014, 07:05 PM   #13
Sgtrhoads
Registered User
1995 YJ Wrangler 
 
Join Date: Jun 2011
Location: Watertown, New York
Posts: 25
Thanks I'll try that tomorrow
Sgtrhoads 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.