Howell fuel injection. I-6, High idle -
LinkBack Thread Tools
post #1 of 7 Old 02-22-2012, 04:44 PM Thread Starter
Registered User
1980 CJ7 
Join Date: Mar 2011
Location: chandler
Posts: 341
Howell fuel injection. I-6, High idle

So jeep is running around 1,000 rpms at idle. Let it run for a couple of minutes, tried spraying around the "spring throttle" area with WD40 to see if that would help and it's still idling high.

Anyone have a pic of where you can adjust the idle? I've never have done it so I'm not sure what direction to go in.

Also, is 600 the mark for the idle on this particular setup?


offroadz is offline  
Sponsored Links
post #2 of 7 Old 02-22-2012, 04:50 PM
Registered User
1981 CJ8 
Join Date: Apr 2010
Location: The Little Apple
Posts: 3,408
~650 is what the Howell kit should run at. Did you let them know your altitude when you ordered? Don't think it matters, the CA chip on mine does ~700 at 5K'.

No codes? What happens when you release the throttle cable and let it do its own thing?
walkerhoundvm is offline  
post #3 of 7 Old 02-22-2012, 04:51 PM
Registered User
1984 CJ7 
Join Date: Aug 2009
Location: Lake Forest CA
Posts: 327
Does it run "high" idle continioulsy, or is it higher at first (say 1500) then drop down to 1000.

Mine high idles for the first 2 minutes or so to "warm up" faster then settles down at about 750 holding rock steady.

Is this a "new" install, or one that worked good and now has changed?
sherlocktk is offline  
post #4 of 7 Old 02-22-2012, 05:06 PM
Registered User
LT1CJ7's Avatar
1983 CJ7 
Join Date: Aug 2004
Location: [duhm-as]
Posts: 4,512
If its a new install, let it warm up to operating temp and take it out for a test drive.
It's common for it to idle high for a few minutes, plus the ecm will learn,log to the driving habits, then should stabilize after a few miles.
LT1CJ7 is offline  
post #5 of 7 Old 02-22-2012, 11:21 PM
Registered User
1986 CJ7 
Join Date: Dec 2007
Location: Denver Colorado
Posts: 1,879
If all fails you can knock out this plug to adjust it. Pic from Fatmans jeep
Attached Thumbnails
1986cj is offline  
post #6 of 7 Old 02-23-2012, 03:41 AM
Registered User
1985 CJ7 
Join Date: Jun 2008
Location: Chicago area
Posts: 3,549
Actually there is a procedure just turning the screw wont do any thing.
Idle Air Control

Tools needed:
  1. Torx bit # T-20
  2. Paper Clip
  3. Small Punch
Take the paper clip and open it up and form it into a big "U" shape. Insert the clip ends into the ALDL in the 'A' and 'B' pins.
Turn on the ignition, but don't start the engine. Wait 30 seconds. Now, go remove the connector from the IAC.
Start engine. You are now going to adjust "minimum air". There is a Torx screw on the side of the throttle body. This is what needs to be turned to adjust minimum air, or more commonly known as "idle speed". It comes from the factory with a protective metal cap over it. If the cap is still there, use a small punch to knock it out. Set the idle speed to 450 rpm, rotating the Torx screw clockwise to raise rpm, and counter-clockwise to lower rpm. Once the idle rpm is set, turn off the engine.
Re-connect the connector onto the IAC. Start engine. Idle speed is now once again governed by the ECM, but your idle should be smooth and steady, approximately 600 rpm in Drive (for unmodified cars).
If you set an SES light by having the IAC disconnected, then after shutting down the engine disconnect the negative battery terminal. Wait 5 minutes. This will clear the ECM of all trouble codes. Re-connect the battery and drive the car for 20 minutes to allow the ECM to relearn your driving style.
gmakra is offline  
post #7 of 7 Old 02-23-2012, 08:48 AM
Registered User
1983 CJ7 
Join Date: Jul 2011
Location: Boulder
Posts: 338
Mine idles high, around 1K until the engine gets warmed up, then it sits around 700, if not a little lower. I was running at around 650, but have been having issues lately with it dying on me when driving. The idle would drop really low when letting off the throttle. I upped the idle a little and that seems to have helped. I just adjusted the idle the other night. gmakra has the correct process, but forgot one step. When you adjust the idle screw you are actually manually setting where the throttle linkage sits. As a result, your throttle position sensor (TPS) will be off. It is just a POT that relays where the throttle is to the EMC that helps to control fuel on sudden acceleration changes.

To adjust: Connect up a volt meter positive to the blue wire, ground to black, and measure the voltage when key is in the run position. You should be right around 0.50 V If you are not, you can loosen the screws on the TPS and rotate it some to get the voltage you need. You may have to take it off and wallow out the holes a bit to give you some wiggle room. Rotate it and tighten it back up. Make sure you dont leave the key in the 'run' position too long or you risk burning up the ICM. Best to just unplug it and not worry about it while working.

Also the picture 1986cj put up has the plug that is difficult to remove. If you have that one, grind it flat then drill a hole in it to access the screw.

Colorado Jeep Club Member #2086

/l , [____],

()_) ()_)=@=)_)

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
outdoorguy86 is offline  

Quick Reply

Register Now

In order to be able to post messages on the 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

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Howell Fuel Injection for 304 yes or no? 43jeep43 Jeep CJ Forum 9 02-02-2012 08:03 AM
Howell Fuel Injection problem NPear Jeep CJ Forum 20 04-23-2011 09:26 PM
Howell Fuel Injection Problem? kbuss32 Jeep CJ Forum 3 04-11-2008 10:50 PM
howell fuel injection stm8tor Jeep CJ Forum 11 02-28-2007 11:37 AM
HOWELL fuel injection rtfoot Jeep CJ Forum 10 11-13-2005 02:42 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