Question about 1998 Mitsubishi Diamante

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Idle speed contro; was replaced but 1998 diamante still idles high

Replaced the idle speed control motor car still idles high

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  • 6 Answers

You have a vacum leak

Posted on Jan 10, 2013

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Posted on Jan 02, 2017

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SOURCE: 1993 Mitsubishi Diamante Wagon/ECO /idle

Eco or PWR are lights that should be on one at the time (depending on what driving mod you choose. the button locates on the gear box. it has nothing to do with ideling. what you must check is the air filter and the whole intake pipe. make sure everything fits and nothing loose. check the cables too. make sure all wiers are fully pluged in. if the problem continues check on missfiering. http://www.youtube.com/watch?v=-TOQJIW19C8   after if nothing helps the cr probably needs a tune up. 

Posted on Sep 16, 2009

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SOURCE: change timing belt and idle speed servo kit.

send me your e-mail so i can send to you full repair instruction and picture
mutasem2002@hotmail.com

Posted on Dec 27, 2008

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SOURCE: 1999 mitsubushi eclipse shows p1390 engine code

have you had a recent timming belt if so get it re timmed

Posted on Jul 29, 2009

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SOURCE: Car cuts out at idle

idle control valve. bad plug wires and bad plugs will all cause that as well as a air leak in the vacumn hose on galant

Posted on Jan 21, 2010

ZJLimited
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SOURCE: 02 mitsubishi eclipse p507 code.

P0507 - Idle Air Control (IAC) System RPM Higher Than Expected

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

Potential Symptoms: Most likely you'll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

Causes: A P0507 DTC trouble code may be caused by one or more of the following:
* A vacuum leak
* Leaking air intake after the throttle body
* EGR valve leaking vacuum
* A faulty positive crankcase ventilation (PCV) valve
* Damaged/failed/dirty throttle body
* Failed EVAP system
* Failed IAC (idle air controller) or faulty IAC circuit

Possible Solutions: This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.

If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedures.

Hope helps.

Posted on Aug 17, 2010

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1 Answer

My van is idle high i cleaned the throttle boady and it idle down the a few hours later its high idle again why i replaced two sensor and still idle high


Hi Alexandra, Im AL the owner of Big As Auto Repair

There are several things that can cause high idle, but the 2 most common problems are as follows.

(1) You could have a vacuum leak somewhere on the engine. Here is how to check for that issue. Here's what I want you to do: Buy a can of CARB Cleaner and while the engine is running spray around the Intake Manifold, the manifold is the thing the throttle body sit on. Also spray around all the vacuum line as well. If while spraying there is a change in the idle speed then you have found your leak. If there is no change then move on to step 2.

(2) Sometimes when you have a high mileage vehicle parts begin to ware out or can also begin to stick in place. Here something you can check. Idle Air Control Motors can start sticking from corrosion build up and can cause a high idle issue. Here what I want you to do. Start the engine and let it idle, while its idling I want you to tap on the Idle Air Control Motor If it idles down to normal idle speed replace the motor. The motor mounts onto the throttle body and most of them are round. Once you replace it and start the engine you'll notice that its idling real high, :This Is Normal, just let it idle until the engine controller resets the idle speed to normal.

Hope this helps and should you need further help please visit my auto repair website. http://www.bigasautorepair.com/

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Just started idling rough, sometimes stalling


Shot in the dark here without knowing the vehicle but it could be an Idle Air Control valve starting to fail. An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air. An idle air control motor can fail one of two ways, either the motor short circuits and stops working or the motor will develop high resistance and cause the idle air control motor to react slowly, either failure can cause the engine to stall at idle. When a trouble code scan is performed it sometimes won't always detect a failed or weak idle air control motor. To check the idle air control motor remove the unit, with the wires connected turn the key to the "on" position without starting the engine, the idle air control should move in or out. If the idle air control motor does nothing it has probably failed, replace it with a new unit and recheck system. Note: while the idle air control motor is removed clean (use aerosol carburetor cleaner) the passages the idle air control uses to control idle air speed, also inspect the idle air control for a build-up on the seating (pointed) end and clean as necessary.

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High --1600 rpm ?? rpm idle


The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.

When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.



Hope this helped.

Have a great day !!!

Apr 07, 2011 | 1992 Buick LeSabre

1 Answer

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Since all engines are controlled by the computer, you cannot manually reset idle speed. The idle is controlled by an idle sensor.

Jun 19, 2010 | 1995 Mitsubishi Diamante

1 Answer

When i disconnect the idle speed control air bypass valve the idle drops to where i want it.does that mean it needs to be replaced? 1998 rav4 high idle problem what is correct idle?


hi, yes it doens mean it needs replacing you will find replacing this will solve your problem.

Changing this will solve your idle problem.

Let me know how you get on or if you need further assistance ok

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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.

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thats the code ... its releasing why though???
idling high GM trucks I found plugged catylac converters with bad oxygen sensors ...probable from what i seen on vortecs .....
and also if you got a vacuum gauge unplug egr top vacuum line put a vacuum gauge see if the gauge is erratic from the motor at idle...emission problem
if you unplug the egr line and the car leans out its a oxy sensor..!!!!

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it would not be an O2 sensor, period, they would never cause a high idle, have u had this checked for trouble codes? A sticking idle speed control air bypass can cause this problem as well as a throttle position sensor, but run the codes, Kragen does it for free was well as other parts stores.

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