how do I lower my idle? - 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 08-24-2000, 06:42 PM
farfrum
Guest
 
Posts: n/a
how do I lower my idle?

Hey I have a 87 Wrangler/YJ, with the 2.5L 4cyl fuel injected. The engine idles around 1000rpm, after about half an hour of stop and go driving the idle increases to between 1500-2000rpm. Can I adjust the idle down, or should I be looking for a sensor problem or leak?
Any help would be great.

'84 Yoda 4X4 stock pick-up
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 08-24-2000, 06:57 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: how do I lower my idle?

the computer controlls your idle by adjusting the iac(idle controll motor),if it idles normaly at first,i would be looking for a sensor problem,use of a "scan tool",would probably find it quickly.if you dont have one of these 3000 dollar tools,you might be better off taking it to a trusted tech.you can spend a lot more guessing and throwin parts at it.

all laws only affect the law abiding
support capital punishment,guarantee no repeat offenders
post #3 of (permalink) Old 08-27-2000, 10:33 AM
 
Join Date: Aug 2000
Posts: 317
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: how do I lower my idle?

good point about the iac, but if it gradually speeds up after it's warmed up for a while, i would try spraying carb cleaner along the joint b/w the intake and the head and listen for a change in RPM.. this gasket is notorious for leaking @ somepoint in a jeeps life, and a vaccum leak like that will play hell with all your sensors and your idle.

Good luck.

Dave


Bald_One is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 08-27-2000, 12:37 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: how do I lower my idle?

A vacuum leak is the likely suspect. The intake gasket is the first place to look. Tighten all the bolts at least every 15K. Also check all the vacuum hoses to the power brake booster and emission system components by pinching off the lines one at a time with a needle nose pliers, the engine speed will change.

The stepper motor that controls idle speed is a possible suspect, also. You should hear/see it kick the throttle about 3 times as you shut down the engine. Also, it should
move a little as the engine first starts. The threaded nut on the end of the stepper is adjustable, the factory idle is around 800 rpm or so.

Hope this helps, good luck!

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