2.5L Timing - JeepForum.com
LinkBack Thread Tools
post #1 of 3 Old 08-26-2013, 11:57 PM Thread Starter
Registered User
2001 TJ Wrangler 
Join Date: Aug 2013
Location: Seattle
Posts: 2
2.5L Timing

I know that this has been covered here before, but I need to dig a little deeper than has been discussed. I have an '01 TJ / 2.5L. I just installed a new rebuilt engine and am having some timing issues. I know that the service manual and member on here swear that you cannot adjust the timing, but I am not satisfied with that answer.

I have found that I can adjust the timing by putting the harmonic balancer at TDC "0" with the rotor facing the #1 plug on the distributer cap. In doing this you can either advance the timing or retard it by unbolting the distributer, pulling it out and turning the adjustment screw on the top of the oil pump. The3n when you put it back in the rotor will be moved to the new spot.

Now...with #1 at TDC and the HB at 0 on the timing reference guage my engine runs like poo. When I adjust the distributer as mentioned above it does get better. Although, there is a slight vergence in the force at times when I rev the engine. Is there a trick or technique to turning the distibuter only 1 tooth at a time, or is it all trial and error.

Also, with everything aligned the timing light at idle says that I am at about +8 TDC. This seems a little much since both the rotor, HB and #1 are where they need to be or so it seems.

I also hooked up my OBDII reader and it says that the "spark advance" is at 17.

Thanks to anyone that can explain this and help me out.

Bogger28 is offline  
Sponsored Links
post #2 of 3 Old 08-27-2013, 12:50 AM
Registered User
2000 TJ Wrangler 
Join Date: Jul 2011
Location: Round Rock
Posts: 48
You sure the reason its running bad is the timing and not some other issue with your new engine?

New distributor, reman one or old one pulled from the bad 2.5?

2000 TJ
M1Garand is offline  
post #3 of 3 Old 08-27-2013, 11:21 AM Thread Starter
Registered User
2001 TJ Wrangler 
Join Date: Aug 2013
Location: Seattle
Posts: 2
The engine is a new reman with a 7 year warranty. The distributer was pulled from the engine I had in it before. I have also suspected that it could be a small vacuum leak somewhere as well. It is just really weird that the service manual says that the timing should be set to zero and then the electronic timing will take over from there. It is really hard to get it close to zero
Bogger28 is offline  

distributor , idle issue , missing , timing , timing chain

Quick Reply

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


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

Email Address:


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

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