---

Register Log In 4x4Wire TrailTalk Forums Mitsubishi 4x4 and SUV Tech Trouble finding the IAC (Idle revving up and down) Forums User List Calendar Active Threads Search Forum Help

Previous Thread Next Thread Print Thread Rate Thread Trouble finding the IAC (Idle revving up and down) #1078907 09/10/15 02:50 AM Joined: May 2013 Posts: 35 Southern Pines, NC M mfarmer10 OP Getting the Wheeling Fever So I'm on the hunt to find out why my idle starts revving so high then dies back down. Reading up on this it sounds like the IAC/ ISC could be to blame. Should I take this off and give it a good cleaning or just replace it entirely? Is this what's located underneath the throttle with a large black plug? 3.0 89 raider Re: Trouble finding the IAC (Idle revving up and down) [Re: mfarmer10] #1078911 09/10/15 02:48 PM Joined: Aug 2014 Posts: 173 New York danz91crx Wheeler You will find the Factory Service Manual at Mitsubishilinks The page is setup so you can donate to the host of the FSMs and help with his cost to keep them available. The IAC is next to the throttle position sensor closer to the firewall. Is your check engine light on? Do you get the erratic idle at startup or only after the engine warms up? Have you checked your coolant level? 1990 LWB RS A/T 1990 LWB Base A/T 1991 LWB LS A/T Going...Going... Re: Trouble finding the IAC (Idle revving up and down) [Re: danz91crx] #1078913 09/10/15 04:47 PM Joined: May 2013 Posts: 35 Southern Pines, NC M mfarmer10 OP Getting the Wheeling Fever I downloaded the manual and I'm still having troubles finding it. But yes my check engine light is comes on and off. And sometimes it's a bit difficult to start. It will act like its struggling to stay on and then suddenly rev itself pretty high Re: Trouble finding the IAC (Idle revving up and down) [Re: mfarmer10] #1078915 09/10/15 05:35 PM Joined: Aug 2014 Posts: 173 New York danz91crx Wheeler Guess I should have looked first. The IAC is under the air intake hose and yeah it has a large black plug. Has the two small coolant lines going to the intake next to it too. Info on checking your engine codes is in the FSM along with testing methods for the IAC if you want to remove and test it as well. Recently my idle was temporarily erratic when I was refilling my coolant after doing a system flush. That's why I asked if you checked your coolant level. If the temp sensor is getting bad readings it can effect the idle. 1990 LWB RS A/T 1990 LWB Base A/T 1991 LWB LS A/T Going...Going... Re: Trouble finding the IAC (Idle revving up and down) [Re: mfarmer10] #1078916 09/10/15 05:44 PM Joined: Aug 2014 Posts: 173 New York danz91crx Wheeler If you were having any trouble finding info in the FSM you downloaded its in the mpi-system file 1990 LWB RS A/T 1990 LWB Base A/T 1991 LWB LS A/T Going...Going... Moderated by  4x4Wire, Macka, Mudraider, off-roader, PHIL_, rxinhed  Hop To Mitsubishi Forums ------  Mitsubishi 4x4 and SUV Tech  Mitsubishi Diesels  Mitsubishi ArchiveToyota Forums ------  Early Toyota Trucks  Toyota 4Runner, FJ Cruiser &...  T100 & Tundra Forum  Tacoma Forum  Toyota Tech ArchiveJeep Forums ------  Jeep Talk  Jeep TechIsuzu Forums ------  Isuzu 4x4 & SUV Talk  Isuzu 4x4 & SUV Tech  Isuzu DieselsKia Forums ------  Kia Talk  Kia Sportage & Sorento TechOff Topic Chat ------  4x4 Gallery  Off-Topic Chat  Recreational Access & Land ...  Politics4xForums ------  Outdoor Gear  General 4x4 Discussion  Tools and Fabrication  General Communications  Amateur Radio  GPS and MapsParts Bin ------  Private Party - Garage Sale  Private Party - Items wanted  Vendors, Hot Deals, Group Buys4x4Wire Back Yard ------  Suzuki Forum  AZ Crawler Crew  Cal-Nev Crew  General Ford 4x4 & SUV Forum  General Dodge 4x4 & SUV Forum  General Chevy 4x4 & SUV ForumFeedback & Testing ------  Problems, Questions, Suggestions4x4Wire Staff ------  Forum Moderators  Problem Threads Print Thread Switch to Threaded Mode 5 Excellent 4 Good 3 Average 2 Bad 1 Terrible View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts

Default Style 4x4-lt-blue 4x4-new Forum Rules · Mark All Read Contact Us · 4x4Wire TrailTalk

OutdoorWire, 4x4Wire, JeepWire, TrailTalk, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc. and MUIRNet Consulting.
Copyright (c) 1999-2019 OutdoorWire, Inc and MUIRNet Consulting - All Rights Reserved, no part of this publication may be reproduced in any form without express written permission
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.