Question about Cars & Trucks
There will be a screw on the throttle shaft that can be used to adjust idle rpm but you should find out why the idle mixture screw is not making a difference. Check for vacuum leaks in all the lines and manifold gaskets.
Posted on Nov 20, 2013
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Idle speed is not adjustable, it is controlled by the fuel injection computer, even if you tried to adjust it the computer would over ride any adjustment made by you. I assure you idle speed has negligible affect on fuel consumption
Posted on Sep 08, 2008
Hi djay ,you need to check the vacuum pipes beneath the injector pump it they are intact and test them with a vacuum gauge. The work of this vacuum is such that when you put it drive the vacuum increases the idle speed slightly.
Posted on Dec 09, 2008
your idle can not be manually adjusted. it is controled by the ecm via the throttle position sensor on the throttle body(tps). you have to have a diagnostic scanner to interface with the ecm to adjust the idle. most service shops have this equipment
Posted on May 12, 2009
SOURCE: idle speed adjustment
the ecu drives a unit called an idle airspeed controller.if there is a vacuum leak,the computer will have the idle speed too high.
the IAC is a motor driven valve that controls airflow into the throttle body.it is common for idle speeds in the range of 1400rpm instead of 800 in this situation.
check the air filter,the throttle body cleaned,and the IAC has to be free moving.
also make sure that your coolant temperature sensor is accurate or the computer will think the engine is cold and keep the idle really high.
Posted on May 23, 2009
SOURCE: How to I set idle speed?
Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay. CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Drive ability problems may exist until computer systems have completed a relearn cycle.
IDLE SPEED & MIXTURE
NOTE: Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is not possible. After replacement of Idle Air Control (IAC) valve, system must be cycled as identified for PCM to properly control idle speed. If idle speed is not okay after cycling system, problem is usually caused by a dirty throttle plate or vacuum leaks. Ensure all vacuum components are functioning properly.
IDLE SPEED (4-CYLINDER)
Turn ignition on with engine off for 10 seconds. Turn ignition off for 10 seconds. Start engine and idle for 30 seconds. Slowly vary engine speed between idle and 3500 RPM 5 times. Return engine to idle. PCM will now properly control idle speed. 2.2L (Cavalier & Sunfire) & 2.4L (Alero, Cavalier, Grand Am & Sunfire) Good luck and hope this helps. If it still has the high idle problem, your going to have to buy a can if not two cans ot THROTTLE BODY CLEANER NOT CARBURATOR CLEANER. Just follow the instruction on the can and try to get the Idle Air Control Valve cleaned also which is on the sdie of the throttle body so go to town when cleaning the throttle body and then do the Idle speed relearn again. The other thing to is since your doing house cleaning, buy a MAF sensor cleaner and spray down your MAF sensor and IAT sensor also, this will help with your fuell consumption.
Good luck and keep me posted, be glad to help.
Posted on Jul 04, 2009
Tips for a great answer:
Oct 06, 2014 | 2005 Mitsubishi Galant
Jan 20, 2014 | 1994 Honda Accord
May 01, 2012 | Mitsubishi Pajero Cars & Trucks
Feb 21, 2011 | 2003 Mitsubishi Outlander
Nov 19, 2010 | Isuzu i-280 Cars & Trucks
Sep 17, 2010 | 1998 Mitsubishi Mirage
Aug 18, 2010 | 1994 Jeep Grand Cherokee
Mar 19, 2010 | 1985 GMC S-15
Apr 29, 2009 | 1992 Daihatsu Charade
Aug 19, 2008 | 1996 Toyota Land Cruiser
95 people viewed this question
Usually answered in minutes!