Skip the auto shop - Our mechanics make house calls

Q: The engine keeps shutting off and rpms slowly drop to zero

asked by on

While driving the engine dies and rpms slowly drop...all other things are good. Oil level good, full on gas, battery is charging and above 12 and temperature is good. What is going on?

My car has 100000 miles.
My car has an automatic transmission.

A: Hello. If the RPMs drop off right as the en...

Hello. If the RPMs drop off right as the engine is stalling then the most common cause of this is a bad crankshaft position sensor.

This sensor tells the engine computer what the engine RPM speed is and what the position of the cylinders are. If it fails, the computer does not know the position of the engine so it will stall.

I typically install a computer scan tool to monitor the engine RPM to confirm that the signal is being lost before it dies. If it does, then I replace the sensor. If not then I check the other sensor signals to see what is going on.

If you are going to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to properly diagnose your stalling issue.

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: Shakes flutters stalls won't start

There is another component to the ignition system. The crankshaft position sensor sends out a speed and position signal the computer uses to calculate when to send spark. If you have a code reader that shows live data on the...

Q: When your power steering line that runs to the rack is stuck and will not turn with a wrench at all how do you remove ? 2004 Kia R

I would recommend first removing the power steering pump. Then pull the power steering pump away from the engine as far as the connected power steering line will allow. Then I would use a torch on the flare nut of...

Q: Engine control modules replaced on a newer car

Hi there. These modules are common failures on the Jaguar XF. I am sure that this does not make you feel any better about it, but from my experience, once the modules are replaced you usually do not have any...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...