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Stalling when you turn the air on. cant find an idle air valve assume it is controlled by the electronis throttle body. any suggestions

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The Idle Air Control Valve is located at the side of the throttle body. Once the duct is pulled you should see it sticking out. Cleaning is the first and the simplest thing you could do. Include the throttle body/intake when cleaning. Check also for loose vacuum hoses. Carb cleaner and contact cleaner for the electrical parts would do. IAC valve is the common culprit for stalling or rough idling.
If you can I would suggest to have a scanner connected to the diagnostic port to retrieve errors from the ECU if there are any. Some shops would let you borrow theirs.

Posted on May 26, 2011

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Is this my iacv idler air control valve, I think I gotta replace it because car is being crazy when I hit 50mph and idle is not so good cant gas it for sure

Sounds like you have a couple of different problems. You shouldn't see IAC issues at 50mph, only at idle or when you're starting to accelerate, or decelerate. Issues like an erratic idle or intermittent stalling.

You might need to also clean your intake -idle issues could also be caused by a dirty throttle body.

Dec 31, 2012 | Cars & Trucks

1 Answer

2003 Pontiac Aztek Stalls

In most cases the problem is a dirty throttle body or a faulty idle air control valve.
The computer controls the idle speed by the amount of air going into the throttle body thru the valve.

Aug 22, 2012 | Pontiac Aztek Cars & Trucks

1 Answer

Dies when gas pedal is pressed

This engine has automatic idle speed control, the computer controls a "air bypass" valve on the side of the throttle body where the air intake hose from the air cleaner is connected, the valve and the throttle butterfly get "sludged" up and this causes all kinds of idle problems and off idle stall, see full list below and fix for the problems

Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

Dec 04, 2011 | 1991 Ford F150

2 Answers

Have an automatic transmission, 2001 Kio Rio. Problems when idling, sometimes high, sometimes low and will stall but starts right back up. I've replaced the Mass Air Sensor, spark plugs, air filter, coil....

It sounds to me like you have replaced everything except the most likely cause of your idle control problem...The Idle Air control. (IAC) (or Idle Speed Control Valve) It is located onthe throttle body and looks like the picture below.


Feb 22, 2011 | 2001 Kia Rio

1 Answer

Car goes great for awhile and then engine stalls when stopping , and is hard starting unless you leave key on for awhile to let fuel pump catch up.

This is not the fuel pump, this is an idle air control issue. Either the idle air control valve is gummed up or the throttle body interior is filthy or both, the fix is very cheap. Disconnect the air ducting between the air filter cleaner and the throttle body. Using WD40 spray and a cloth clean the throttle interior and throttle plate until like new. Pivot the throttle plate by applying pressure with your fingers and clean in as far as you can behind the throttle plate. Remove the idle air control (IAC) valve from the throttle body and clean the associated passageways and pintle valve. Make sure the electrical connectors to the IAC is clean and reassemble everything. You should notice an immediate improvement to engine performance from start up and no more engine stalls.

Dec 29, 2010 | 1998 Chevrolet Monte Carlo

5 Answers

My 04 f150 had a rough idle and would sometimes stall out. dealer said it was throttle body so I replaced. The idle is still rough but it it doesn't stall. Could it be a coil pack? if so do I need to...

I have a 2005 f150,with a 4.6 and it idles rough and when you turn on the ac it wants to die. Checked the codes and there are no codes.Any suggestions?

Apr 30, 2010 | 2004 Ford F150

1 Answer

Stalls at idle and in traffic

Your idle air control valve may be dirty with carbon and needs to be cleaned or replaced. Try cleaning it first by cleaning out the throttle body with throttle body cleaner, do not use carb cleaner since it's too corrosive to the throttle body gaskets. You can buy the throttle body cleaner at Auto Zone and they can help you, by giving you the information you need to clean out the idle air control valve which is in the throttle body. Good luck and this should helps. 

Sep 16, 2009 | 1999 Toyota Camry

3 Answers

I got a 94 buick regal it has the 3.8 and it stalls mainly when i breack going up to a stop sign ask many people no one can help

The idle air control valve may be dirty with carbon and not working properly. You can try cleaning out the throttle body with two cans of throttle body cleaner, make sure you follow the instructions on the can and do not use carb cleaner. The carb cleaner is to corrosive to the gaskets used in throttle body's. Try to clean out the passage way to the idle air control valve at the throttle body. Once the throttle body has been cleaned and the instructions have been followed, you can reset the idle air control valve by turning the ignition keys to the on position for 30 seconds and then turn the keys to the off position then on for 10 seconds and then start. The engine may idle high then come down, wait for it to come down and idle for 1 min then go out for a test drive. that should fix the problem. If not try resetting the idle air control valve again. Good luck and keep me posted, most of the time it's a dirty or bad idle air control valve at the throttle body. 

Sep 04, 2009 | Buick Regal Cars & Trucks

1 Answer

1995 neon stalling intermitinly when deacelerating

Is it stalling at idle, or while driving? Have you performed a Throttle Body Service? The Tps usually wouldn't cause a stalling problem at idle, and it would generally throw a check engine light. The Idle air control valve, on the other hand, could be clogged full of carbon and not allowing any or enough airflow through to the enging. You should remove the throttle body, pull out the idle air control valve, and if it is dirty, clean thoroughly with any throttle body cleaner from a parts store.

Apr 25, 2009 | 1995 Dodge Neon

2 Answers

Code P505 - stalls when warm

Definite signs of intermittent vacuum leak downstream of the maf. Check for leaks from the air cleaner to the throttle and all hoses on the intake manifold. Also check for leaky intake manifold gaskets.
Do It Yourself Diagnosis and Repair

Sep 21, 2017 | 1997 Mitsubishi Galant

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