Skip the auto shop - Our mechanics make house calls

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?

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Low tire pressure light is on all the time, even after adding air to the tires

The tire pressure monitor requires a good signal from each wheel air pressure sensor. These sensors communicate with the tire pressure monitor and will send the tires' air pressure. The tire pressure sensors are part of the valve stem on...

Q: Tiptronic transmission -reverse gear slide 2002 VW Jetta

Hello - your problem looks like it might be a problem with the valve body of the transmission. Wear within the valve body results in low clutch engagement pressure - forward or reverse - and slippage as you have noticed....

Q: Does a bad torque converter cause the transmission to not engage into any gear at all?

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Related articles

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...
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...
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.