Home Ford Ranger Forum Builders Guide How To Tech Other Articles Featured Rangers Readers Rangers Classifieds Shirts & Decals

 
Old 11-28-2017, 01:33 AM   #1
snahman
New Member
 
Join Date: Aug 2016
Posts: 27
Rep Power: 3
snahman is on a distinguished road
Default '91 Ranger 3.0 High Idle..!

Hello..My 91 3.0 just started all of a sudden idling high..! It idles in park around 2000 rpms. I took off the IAC cleaned it,replaced and it actually idle down to normal. I then shut off the engine came back about 30 minutes later and it started idling high again! Thanks..!
BTW, with the truck running, I can unplug the IAC and it still continue to run at high idle.So this means vaccumn leak some where else? There is a leak coming from the brake booster hose grommet especially after you shut the engine down you can hear it and when you push around on the fitting going into the booster, it stops leaking! Could this be a contibuting even though the leak was there before I started getting the high idle and it ran normally..Thanks..!

Last edited by snahman; 11-28-2017 at 01:47 AM. Reason: Additonal info
snahman is offline   Reply With Quote
Advertisement (Not shown to 'Premium Members')
Old 11-28-2017, 12:04 PM   #2
RonD
Member
 
Join Date: Jun 2012
Posts: 10,791
Vehicle Year: 1994
Vehicle Make: Ford
Vehicle Model: Ranger
Rep Power: 48
RonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant futureRonD has a brilliant future
Default

Cold engine should idle at about 1,100rpm, computer is Choking cold engine until it warms up, high idle with Rich fuel mix
Then as it warms idle will start to drop down.

Yes, with IAC Valve unplug from power RPMs should drop to 500 or engine should stall either is correct, and means no vacuum leaks.

Could be PCV valve is dirty/bad, PCV valve should be closed at idle, very little air flow passed it, thats what the weight inside it is for.
RonD is offline   Reply With Quote
Old 11-28-2017, 02:52 PM   #3
snahman
New Member
 
Join Date: Aug 2016
Posts: 27
Rep Power: 3
snahman is on a distinguished road
Default

Quote:
Originally Posted by RonD View Post
Cold engine should idle at about 1,100rpm, computer is Choking cold engine until it warms up, high idle with Rich fuel mix
Then as it warms idle will start to drop down.

Yes, with IAC Valve unplug from power RPMs should drop to 500 or engine should stall either is correct, and means no vacuum leaks.

Could be PCV valve is dirty/bad, PCV valve should be closed at idle, very little air flow passed it, thats what the weight inside it is for.
Hello..Thanks for the reply.I put in a new PVC but I guess it could be not an optimum one....Advice on a better one..?
snahman is offline   Reply With Quote
Reply

Bookmarks



Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
99 ranger high idle 99MOranger 3.0 Liter Forum 8 02-28-2015 06:15 PM
95 ranger high idle help!! huey General Discussions 2 04-22-2012 08:00 AM
ranger high idle fullmooner123 General Discussions 1 05-05-2011 12:22 PM
84 ranger high idle SETI_CruncherXy General Discussions 0 09-15-2009 10:21 PM
ranger high idle t5cents 3.0 Liter Forum 4 03-24-2009 09:51 PM




All times are GMT -5. The time now is 07:41 AM.




1999-2018 / 959 Media LLC / All Rights Reserved