Skip the auto shop - Our mechanics make house calls

Q: Cause shuts off when i stop at a red light and also it stall. Can it just be the Crankshaft position sensor

asked by on

I've noticed my car has been shutting down on me when i hit a red light and i would like to know for sure if its the Craft-shaft position sensor that needs to be replaced.
My car has an automatic transmission.

Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate and eventually stall. The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly. I would recommend having a professional come to your location to diagnose and inspect your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • Cause shuts off when i stop at a red light and also it stall. Can it just be the Crankshaft position sensor

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: Transmission problems, cannot reverse

Hello. It sounds like the transmission that was rebuilt and installed in your vehicle has failed. Start by having a mechanic take a closer look at the issue. A certified mobile mechanic from YourMechanic can inspect your transmission and shifting...

Q: CVT problem on Maxima

This would depend on exactly what your transmission is doing. Depending on the symptom the TCM may have an issue but it could also be an internal transmission fault. I would recommend having your transmission inspected by a qualified transmission...

Q: I have a 2010 ford fusion. The check engine light is on. My car jerks while driving. The rpm goes up and down while driving.help?

Hi there. Usually an engine that is displaying these type of symptoms is caused by a fuel system restriction, a vacuum leak or a sensor that has a faulty connection and is causing inconsistent or misfiring cylinders. Since the check...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...