Question about Dodge 1999 Ram Van 1500 Conversion

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Runs great idle high like to bring down how do i adjust my trottlebody

How to adjust idle on throttle body

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These are usually not adjustable. High idle could indicate a leaking gasket.

Posted on Nov 16, 2014

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Motor will start but it is hard to keep it at idle and the motor revs up and down cant seem to adjust it with the choke any help with this would greatly be appreciated


A bad Idle air control will cause this! your car will have abnormal idling. Highly fluctuating idling or sporadic stalling, You can remove the IAC and clean it with throttle body cleaner, It may be all carboned up, It is located on or near the throttle body. god-Bless! hope this helps you.This part regulates the air entering engine, if not enough vehicle will stall.

Nov 20, 2015 | Cars & Trucks

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How do I adjust the throttle body


The throttle bodies on most newer cars are not adjustable for its idle speed. If the Check Engine Light is on, go to the nearest auto parts store and get them to pull the error codes from your car's computer. Post the codes back here and we can give you a better answer to your question

Mar 22, 2015 | 2007 Toyota Corolla

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1987 60 hp mariner idle & high idle great, stumbles/ stalls in gear on take off, head gasket or poor idle adjustment?


Clogged idle circuits in your carbs. Clean jets and passages.
You can try suck dirt out, therefore: Screw the idle mixture screw out ( almost totally ), give full throttle ( 1 second ) and then hold your hand against the carb air intake.
This will give maximum suction and can suck the dirt trough tje circuits.
Also, first drain the carb(s) to be shure there is no water in it...

Aug 22, 2017 | Light Boating

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Where is the vacuum modulator on a 1989 Chevy silverado 4x4?


Have you tried to adjust the idle itself to bring it down? The adjustment should be right on the throttle body where the gas pedal is connected to the throttle body. There should be a screw that will allow you to adjust the idle up or down. If you loosen the screw it will take your idle down

Jun 02, 2012 | Cars & Trucks

1 Answer

Idole to high


If your idle is too high it can mean a few things with computer controlled engines. Most common problems relate to the sensors in your throttle body being dirty or faulty. If after your disassemble your throttle body and clean the throttle body and sensors you still have the issue you can adjust your idle through the Idle Adjustment Screw.

Jan 17, 2012 | 1996 Oldsmobile Cutlass Ciera

1 Answer

What does the code po85 mean for a 1994 cadillac deville


It means that the throttle body is dirty and the deposits in the throttle bores are restricting air flow at idle to the point that the idle speed control has no more authority to maintain the correct idle speed.

Take the air cleaner off, hold the throttle wide open and look down the throttle bores. Spray the throttle bores with carb cleaner and scrub the bores and backside of the throttle blades with an old toothbrush. Cleaning the deposits off the bores and throttle blade backsides it will restore the idle air flow to the correct level. When the throttle body is clean, disconnect the battery negative cable for 60 seconds to reset the idle learn offsets to the "clean throttle body" default values.

While you are in the throttle body and looking down the bores....see the two tubes sticking up at you from the intake manifold floor just below the throttle blades...??? Those are the EGR tubes and they are NOT supposed to be full of carbon and crud. Rod them out thoroughly with a piece of stiff wire to remove the deposits. Go all the way down thru the tubes to the cast passage below and make sure that they are clean and unrestricted so that the proper amount of EGR can flow.

Turning the key to the run position extends the ISC anticipating a restart, so if the setting is incorrect it would not erase a hard code. Just turning the key to run would light up both the service soon and service now lights as a bulb check, in other words, letting you know the bulbs work. Do you have the factory service manual?

The ISC adjustment is simple on this car. With the engine running and at operating temperature, You raise the throttle arm slightly with your right hand and push the shaft of the ISC in to fully retract it with your left hand. With constant pressure on the ISC shaft it will slowly retract. The very second it bottoms, you quickly remove the wiring connector to the ISC. Now you should have a very low idle and a gap between the throttle arm and the tip of the ISC. Approx. 0.060 of an inch. Once you know the gap is correct, shut off the engine, wait 10 seconds and reconnect the ISC wiring. Restart the engine and the ISC is set to spec. The TPS setting must be verified at this time. At minimum idle, ISC not touching the throttle arm, and unplugged, the TPS should be reading approx .0 or .1. Once the ISC is reconnected, you should see a TPS reading of approx. .5 at idle. with the A/C off.

A hard code can be erased but will continue to reset as long as the reason for it has not been corrected. Idle learn procedures were designed into later year engines with multi port fuel injection to adjust idle regardless of the amount of coke build up within the throttle body. Your fuel injection system does not build up coke or deposits because the 2 injectors spray down thru the throttle body, effectively cleaning the throttle body while running. Alot of owners adjust the ISC as if it were a throttle stop screw on a carb. guessing as they go. The ISC and TPS "MUST" be in sync to get the best off throttle response and smoothest idle. Adjusting the ISC without verifying gap or TPS voltage usually results in a surging or too high warm idle. You say the car failed at idle. For what reason? CO or HC? or idle too high?

Tell us news.

Jul 20, 2010 | 1994 Cadillac DeVille

1 Answer

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 to adjust idle on 94 eclipse


you should be able to adjust it by the trottle cable check under the hood and see if theres not two nuts holding your trottle cable in place if so ajust if need be. this is a easier way to increase your rpm at idle but you shouldnt be able to decre your rpms at idle this way. for that yu may have to look and see if there is a adjustment screw on your trottlebody that can increase and decrease your rpm at idle. if your have a low idle problem try cleaning the inside of your trottle body really good with a lint free rag and some trottle body cleaner also try cleaning your idle control vavle if cleaning your trottlebody didnt help.

Jan 22, 2010 | 1994 Mitsubishi Eclipse

1 Answer

Engine wont idle on my vitara jlx 1993


Check your air idle control valve, check for the wires to be fretted or broke, and also check the vacuum lines to it. 
The air idle control valve mey be dirty and a good cleaning with throttle body clean through the throttle body may help clean the carbon build up. 
If there is a Auto Zone, have the Vitara scanned for a DTC code. 
Here is a few things you can do. 
Checking  the IAC (it's called the ISC on Single Point TBI)
It is screwed to the throttle body, and has a 2 pin electrical connector) with an Ohmmeter - the solenoid should be 11 to 14 ohm.  If not, replace.  


To test the IAC / ISC
Use a Duty Meter, and adjust the air adjust screw to get 50%.  If the revs are not right at that point, adjust some more to try to get them correct, but if the duty goes below 28%, a vacuum leak is highly likely.

Air Adjust screw for TBI / Single point   look on the Throttle Body, just below the fuel line and maybe an inch to the left of the Fuel Pressure Regulator - it looks like a cross head screw into the TB.

The 8v (Single Point / TBI) uses a throttle opener device to open the throttle extra during starting.  When the engine starts to run, a vacuum line is applied to the device through a vacuum servo valve, controlled by the ECM. The vacuum closes the throttle opener, to bring the revs down to normal.  The ECM will operate the VSV after about 10 sec from engine start (less if the coolant is warm).

Try these things for now and keep me posted. good luck.

Jun 01, 2009 | 1999 Suzuki Vitara

1 Answer

Idle problem on 91 applause


You may need to adjust your TPS. That is the little black box that hangs off the side of the throttle body.

It should be adjusted so that the switch opens as the TB cracks open.

Oct 06, 2008 | 1991 Daihatsu Charade

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