Timing Chain Question - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 11-30-2002, 07:18 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Timing Chain Question

Wow I was chasing a carburetor problem(went out and bought a new one) and it seems I went the wrong way. I checked the play in the timing chain and found 12-13 degrees of turning the crank before the rotor moves. Does this explain the intake backfire, engine missing at mid to high rev's, pinging at bottom of throttle? The strange thing to me is, my timing mark does not bounce around. By the way my odometer is sitting at 133K.
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 11-30-2002, 08:00 AM
 
Join Date: Jun 2001
Posts: 1,705
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Timing Chain Question

Uhhhhhh.....yes. Time for a new chain!
AllLockedUp is offline  
post #3 of (permalink) Old 11-30-2002, 08:07 AM
Way Outta Control
 
Join Date: Sep 1999
Location: usa
Posts: 10,815
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: Timing Chain Question

I rather doubt that's the cause of the problems mentioned,
but that chain and gears should be replaced soon.
Not quite an emergency - yet, but will be shortly.

All that slop will let the cam run slow - retarded, giving
a loss of power but not those symptoms. It would have be
lots more retarded to start acting up that way, like 40+
degrees - and if the loose chain was doing that it would
jump right off, giving more "worser" symptoms - you
wouldn't be chasing a misfire.

"intake backfire, engine missing at mid to high rev's, pinging
at bottom of throttle" - sounds more like ignition problems.

Check the coil output, and coil wire, check for crossfiring
in the cap or even crossfiring between wires.
A good indication of spark jumping out of the wires is a
whitish/blueish mark on the wires, cap, even coil - it's
smoke residue.

Also check advance, if it's advancing too soon it could be
the ping culprit.

To verify whether or not it's fuel, use the propane trick.
It's far cheaper and easier than replacing the carb with
even the cheapest rebuilt carb or even a rebuild kit.

The intake backfire is hopefully just a crossfire.
A bad plug wire on one cylinder often can jump it's spark,
either physically or inductively to another cylinder causing
it to fire when it shouldn't.


Unlikely you'll have to go this far:
If ignition proves to be fine, check compression.
If no problem there, check valve springs - a weak one can
show good compression at cranking speed but cause your
symptoms.



RRich is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

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