Q: Q: Car stalling

asked by on

Hi My car will sometimes stall when shifting from reverse to drive. Sometimes needs longer than normal cranking time to start. The ideal rpm seem to fluxuate when the engine gets warm. The spark plugs and wires are new and the mass air flow sensor has been cleaned. A code reader shows no unusual codes. Please help.

My car has 62000 miles.
My car has an automatic transmission.

You may have a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. Since this valve is controlled by the vehicle’s computer, it will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve. When the engine RPM drops below the normal range of about ~800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your idle air control valve.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Car stalling

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Trying to find the transmission code for a 1996 ford windstar

Your vehicle uses the AX4S Ford transmission. Inasmuch as you have the 3.8L motor, your transaxle model number is PNA-WC. The Ford service part number for that transaxle is F68Z-7000-AARM. If you are having trouble with your transmission be sure...

Q: I have a vw and the rpm jumps up and down as if I'm pressing the gas padel

If the engine is not idling correct then you most likely have codes stored in the computer for the problem and would need to have the systems scanned to get the codes. You may have a problem with the throttle...

Q: Q: Check engine light coming on

Cold weather causes plastic and rubber components to contract. The intake manifold on my truck would expand and contract every winter, setting P0171 and P0174 lean codes. Then finally, this past winter, the manifold cracked. My guess is that you...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...