Question about 2005 Mitsubishi Endeavor

1 Answer

My service engine light is on. and I took it too autozone to be checked and got the results: Large vacuum leak on engine, 2. throttle body condition-dirty and faulty IAC valve/throttle. what does this mean?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mitsubishi Master
  • 8,841 Answers

These are all things that can affect your gas mileage and engine performance.

To check for vacuum leak, look for unhooked hoses on top of engine. If OK, use starter fluid and spray along intake manifold gaskets with engine running. If engine speeds up, there is a leaking gasket.

IAC deals with idle. Does the car idle smoothly? If not, remove IAC to see if it's dirty. I will paste instructions below for the IAC valve.

Throttle body dirty--what code is this? never heard of such a code, but you can clean the throttle body wioth carb cleaner. I will paste instructions below.

IAC valve info:

Operation The amount of air taken in during idling is regulated by the opening and closing of the servo valve located in the air passage that bypasses the throttle valve. The servo valve is opened or closed by the activation of the stepper motor (incorporated within the idle air control motor in the forward or reverse direction. Battery positive voltage is supplied, by way of the MFI relay, to the coil of the stepper motor. The engine control module switches ON the power transistors (located within the engine control module) in sequential order, and, when current flows to the stepper motor coil, the stepper motor is activated in the forward or reverse direction.

Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the electrical connector at the sensor.
  3. Remove the sensor from the throttle body.
To install:
  1. Install the sensor in the opening in the throttle body and tighten the sensor.
  2. Attach the electrical connector to the sensor.
  3. Connect the negative battery cable.

Checking Coil Resistance

  1. Disconnect the idle air control motor connector and connect the jumper (test harness).
  2. Measure the resistance between terminal (2) of the connector at the idle air control motor side and terminal (1) or terminal (3). Standard value: 28-33 ohms at 68°F
  3. Measure the resistance between terminal (5) of the connector at the idle air control motor side and terminal (6) or terminal (4). Standard value: 28-33 ohms at 68°F
  4. If not within specifications, replace the IAC Valve.
  5. If within specifications, check connectors and wiring between the sensor and ECM/PCM.
Checking Operation Sound
  1. Check that the operating sound of the stepper motor can be heard over the idle air control motor when the ignition switch is turned to the ON position (without starting the engine).
  2. If no operating sound can be heard, check the stepper motor drive circuit. (If the circuit is good, a defective stepper motor or engine control module is suspected.)

      my service engine light is - 0029f4e.gif
    IAC picture--mounted on top side of engine.
      Throttle body--loosten clamp to right of throttle body and pull hose off. Use electric parts cleaner or carb cleaner--spray on dirt with engine running. don't touch any sensors inside throttle body--sensors are delicate.

    Posted on Oct 11, 2010


    1 Suggested Answer

    • 2 Answers

    SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

    Hi there,
    Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

    Here's a link to this great service

    Good luck!

    Posted on Jan 02, 2017


    Add Your Answer

    Uploading: 0%


    Complete. Click "Add" to insert your video. Add



    Related Questions:

    3 Answers

    2009 dodge journey, rough idle stalls out at low idle

    Check for carbon buildup in the electronic throttle body. Perform a throttle body cleaning and idle relearn after. Check for vacuum leaks.

    Feb 19, 2018 | Dodge Cars & Trucks

    1 Answer

    Throttle body diagram

    Oh you are looking for an emission system diagram. hose from call out 3 to 4 is pcv make up hose large 1/2 inch in diameter or so and hard plastic, from six ( pcv valve in other valve cover, goes to intake or throttle body area or engine inlet air passage an then continues to the purge valve, purge valve has a green test port cover that acts like a bike valve stem cap on the wheel. The last is 8 which is fuel pressure regulator mounted in fuel rail. Now if it is the fuel pressure regulator that is not hooked up then do not hook it up. It may be your life if you do. This style of for is known to start leaking internally which goes right down I take and gives engine raw fuel making fire and explosion a possibly outcome. Buy new from gm dealer. Big difference in amount of time it will last and engine performance will suffer if use cheap parts.

    I’m happy to assist further over the phone at

    Jan 27, 2014 | 2006 Chevrolet Chevrolet Impala SS

    1 Answer

    I took my 02 envoy to get checked an the machine said i had a leak in the vaccum pipeline what does it sound like i need to do

    The age of your vehicle guarantee's a vacuum leak. It may sound silly but the truth is rubber grommets and hose's shrink and dry out over time and the harsh environment under the hood makes it worse. Check all vacuum lines and fittings attached to the intake manifold, valve covers(pcv valve), and be sure to check for a vacuum fitting on top of the intake just behind the throttle body. Does it fit tight in the hole? You can seal loose fittings with a high-temp RTV (Red) silicone sealant/adhesive. Several small leaks add up and your engine, heat/AC, will be all to glad to tell you about it.

    Check the vacuum line under and in front of the throttle body...with engine idling. It is located under where the air filter snorkel attaches to the engine. Then check all vacuum lines at the intake manifold. Check vacuum lines at distribution block on firewall and check the large brake booster vacuum line from one end to the other. You'll find it!

    Aug 17, 2011 | 2002 GMC Envoy

    3 Answers

    2003chevy pu dies at stop lights, low idle whats wrong?

    yea id definately try cleaning ur throttle body 1st. My 03 1500hd had the exact same bad idle after my battery went bad it would die at lights unless i kept foot on gas i cleaned throttle body runs perfect now took 30min cost 8$ for cleaner at autozone and theres how to videos on you tube

    Aug 13, 2011 | 2003 Chevrolet Silverado 1500

    1 Answer

    Will not idle

    Poster has not provided enough information to diagnose vehicle.What is the engine size?Have any repairs been attempted. Has engine computer been scanned for code or is check engine lamp on? Will engine run if throttle is held partially open? It is always necessary to perform a thorough visual inspection of all underhood components before performing any indepth diagnosis .Check all visible vacuum hoses and connectors for cracks or loose connections, check wiring connectors for same.Check large hose from throttle body to air cleaner box for looseness ,paying particular attention to clamps at mass air flow sensor.If no problem found on visual inspect.,locate idle control solenoid.It is on throttle body and has a 2- wire connector.lightly tap on solenoid body with a small soft hammer or medium screwdriver handle.If vehicle will now idle normally.remove solenoid and clean or replace(best to replace).TIP.An inexpensive engine stethoscope can be used to locate vacuum leaks at hard to see areas.listen for excessive hissing noise.

    Nov 22, 2010 | 2000 Ford Taurus

    1 Answer

    Under 2000 rpms runs bad/hesitates/check engine light

    This IAC valve runs only when your foot is off the gas pedal. Mainly to keep the engine from stalling and keeping it at a safe RPM. If it is running bad under 2000RPM, more than likely its the IAC valve or a vacuum leak. Clean or replace the IAC valve....Hopefully this helps!!

    Apr 17, 2010 | 2000 Honda Civic

    1 Answer

    2002 altima idling too high check engine light on

    The first and easiest thing you should do or have someone do, is check under the hood for a vacuum leak, possibly coming from a cracked or broken hose. Check and inspect all rubber hoses, including the large ribbed hose running to the throttle body (Engine air intake from the air filter box). You can hear a leak if it is loud enough and will sound like a hiss. Your engine is idling high because of a vacuum leak.

    Mar 05, 2010 | 2002 Nissan Altima

    1 Answer

    The "engine power is reduced" light comes on

    po455 is Probable Cause[s]

    1. Defective, loose or missing fuel cap
    2. EVAP canister broke, hose cracked or not connected
    3. Purge or vent solenoid defective
    4 . Vacuum leak at engine po121 code po121 means Throttle Position Sensor/Switch A Circuit Range/Performance Problem . it is usually indicative of a faulty throttle position sensor or faulty wiring harness in the engine bay.

    Feb 27, 2010 | 2006 Chevrolet Impala

    1 Answer

    My engine light came on , took it to autozone they gave me this code p0505, where should I start on geting that light off.

    It's detecting an issue related to your throttle control.
    You could have a vacuum leak; an air restriction in the intake airway or the exhaust; a faulty pcv valve; dirty or failed throttle body

    Sep 25, 2009 | 2000 Mitsubishi Eclipse

    Not finding what you are looking for?
    2005 Mitsubishi Endeavor Logo

    1,507 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Mitsubishi Experts


    Level 3 Expert

    80637 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22326 Answers

    Jeffrey Turcotte
    Jeffrey Turcotte

    Level 3 Expert

    8841 Answers

    Are you a Mitsubishi Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides