Q: Engine shuts off when slowing down or at a complete stop.

asked by on

I have replaced the EGR valve, the oxygen sensor, and the alternator. Once I replaced the alternator, it stopped cutting off while driving. Now, it only cuts off when I'm slowing down or when the car is idle. When it did this a little under a year ago, they said it was my harmonic balancer. It was shaking violently to the point that it wasn't triggering the crank shaft sensor. They replaced the harmonic balancer and it worked fine until about a month ago when it started shutting off again. They threw me code after code and I fixed all of them to be point that no codes are thrown. And it is still shutting off. HELP!

My car has 148280 miles.
My car has an automatic transmission.

Hello, thanks for writing in. This can be caused by a number of things. From the symptoms that you have though I would start by checking the throttle body. If it is very dirty then the throttle plate may be sticking which will cause this to occur. If the throttle body is clean then I usually check the idle control valve to see if it is functioning as designed. If that is fine also then it may be a bad crank sensor. These will fail and act like this. A scan tool would be needed to watch the signal when this occurs to see if it is bad. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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. Engine shuts off when slowing down or at a complete stop.

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: I lost my key to my Pontiac Grand Prix 2003. It will start without the key, but shuts off after 30 sec - is this because i don't have the key?

Hey there. Your vehicle is equipped with what GM calls their VATS system (vehicle anti-theft system). There is an electronic chip embedded in the ignition key and a "chip reader" that is part of the ignition switch. The reader looks...

Q: When I hit the brakes it makes a weird noise.

Hello. Shuddering or pulsating at the brake pedal can be caused by a few things. The first thing I would do is carefully examine the rotors. If they show any signs of severe wear, it may be possible that they...

Q: I blew a head gasket and then I got a bottle of blue devil it seems it sealed but when I start my 2003buick century it grinds

Hi there. The biggest problem with 'engine seal' liquids is that they typically create more problems than create solutions. Unfortunately, when these products are used, it's incredibly difficult to diagnose what's causing your issues without completing a physical inspection. It's...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.