How does the comupter on 4.2 controll timing - JeepForum.com
 
LinkBack Thread Tools
post #1 of 3 Old 04-05-2002, 07:05 PM Thread Starter
dcbeer
Registered User
 
Join Date: Mar 2002
Location: Wisconsin
Posts: 85
How does the comupter on 4.2 controll timing

just wondering how the computer on a 258 controlls the ignition timing...


1988 yj, computer bypass, webber carb and the ever famous BA10/5 transmission (if you have one you know it or will find out).
dcbeer is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 04-26-2002, 06:39 PM
ade
Registered User
 
Join Date: Apr 2002
Location: canada
Posts: 2
The 258 has vacuum advance timing so the engine Rpm decifers the advance
ade is offline  
post #3 of 3 Old 04-26-2002, 06:47 PM
johny1i
Registered User
 
johny1i's Avatar
 
Join Date: Mar 2002
Location: Crestview, Florida
Posts: 782
That is a bit of a mystery subject, but one way is by the computer taking an input from the knock sensor mounted on the intake manifold. If the computer senses any pinging, it will retard the timing. There are probably other factors, also, but I haven't been able to find them.

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
johny1i is offline  
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.



Email Address:
OR

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.




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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
4.0 timing? TJLINGO Engines & Drivetrain 1 11-26-2007 06:21 AM
Getting the timing right . . . SenorCole86 Engines & Drivetrain 1 08-09-2007 10:57 PM
2.5 Timing MJDan Engines & Drivetrain 1 09-02-2003 09:35 PM
help with timing jboyd123 Engines & Drivetrain 1 09-28-2002 02:53 PM
'92 2.5L Timing JeeperJay Engines & Drivetrain 2 12-06-2001 07:34 PM

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