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How do I adjust idle speed after cleaning throttle body

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The idle speed is computer controlled and shouldn't have to be adjusted in any manner nor is there an external adjustment screw [like old carburetors used to have] that you can turn to change anything. Usually what I find when I encounter an engine that is running too fast or slow is that there is another problem that is causing this condition. If your "check engine" lamp is on there should be a service code indicating a problem somewhere.

Posted on Sep 10, 2010

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Stalling crown vic


Dependent on what year you have. If it has an idle speed motor that could be cleaned as well as the throttle body. Idle speed motor may need to be replaced sometimes a good cleaning hooks them right up.

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1998 Durango will not idle


Check A.I.S./I.A.C. motor on throttle body. Known by both names, Automatic idle speed motor (AIS) Idle Air control (IAC) . Usually mounted on side of throttle body, with 2 or 3 torx screws and it's job is to adjust idle at all times as necessary, such as when AC on, turning, etc when extra load on engine, it will increase idle as needed to overcome the load and maintain proper idle speed. You can often remove the motor and clean pintle (pointed end that goes inside throttle body) with throttle body spray cleaner as well as spray inside the port (hole) that it comes out of. Sometimes this will cure the problem for quite a while, but if only for a short time, and it happens again, replace it.

Jan 26, 2013 | Dodge Durango Cars & Trucks

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How do you set the throttle position sensor on 1999 jeep grand cherokee 4.0 litre


That sensor is not adjustable. It slides onto the throttle shaft and is screwed in place to the throttle body. Idle speed is controlled by the computer by adjusting air flow through the idle air control valve. If the idle is too high (you did not say) first clean the throttle body bore and plate, then if necessary remove the control valve, cleaning out the passage in the throttle body and carefully cleaning the valve itself, without turning the plunger. If that does not help, you will need to do electrical testing on that and other components to find out what's going on as well as checking all vacuum hoses attached to the engine for cracks or leaks.

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Idling problem toyota altis


Either there is a vacuum leak causing the high idle, or
the IACV is bad or being controlled by the computer to make idle speed too high:

To change the IACV refer to the following:
Idle Speed Control (Idle Air Control) Valve Removal & Installation To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the throttle body. Idle speed control valve toy_cor-04-18-1187.gif

  3. Remove the 3 mounting screws from the throttle body. Remove the idle speed control valve and gasket.
To Install:
  1. Using a new gasket install the idle speed control valve on the throttle body with the 3 mounting screws.
    • Tighten 33 inch lbs. (3.7 Nm).
  2. Install the throttle body.
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Jul 16, 2010 | 2004 Toyota Corolla

1 Answer

How do i remove and clean the IAC


Operation

The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed. Do NOT attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.
The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the IAC solenoid connector.
  3. Remove the two retaining bolts and remove the IAC solenoid and gasket from the throttle body.
  4. Installation is the reverse of the removal procedure. Use a new gasket and tighten the retaining bolts to 71-97 inch lbs. (8-11 Nm).

Nov 28, 2009 | 1999 Mercury Grand Marquis

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How do you adjust the idle on a 1986 mitsubishi


It's a EFI turbocharged 2.6 L, idle speed is controled by the computer. If you have a fast idle check for vacuum leaks or bad temp sensor, if it idles too slow check and clean the throttle body and IAC motor (throttle body port and IAC plunger).

Aug 18, 2009 | 1986 Mitsubishi Starion

2 Answers

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.

Jul 04, 2009 | Oldsmobile Alero Cars & Trucks

1 Answer

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.

May 23, 2009 | 1993 Mitsubishi Diamante

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