Skip the auto shop - Our mechanics make house calls

Q: My car is jerking. When I plug in the idling sensor, especially after driving a few kilimeters and when I unplug it, the car travels well

asked by on

The car travel well without the idling sensor but is taking a lot of fuel, when i plug in the sensor the car idle well but when moving few kilometer it start to jerk like is cuting fuel

My car has 323000 miles.
My car has a manual transmission.

Hi - it is quite possible your engine is running in "open loop" when the idle sensor is disconnected, simply because the engine computer realizes that a crucial sensor is missing. By design, open loop running will be a richer mixture, with poor fuel economy. The idle sensor has no real purpose once the car is driving at most any speed. When the idle sensor is plugged back in, the computer is trying to adjust fuel mixture as it should, but other sensor problems (which should be setting the Check Engine Light) are overwhelming it. Check for the problem codes being set, and diagnosis will become easier.

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!
  • Home
  • Questions
  • My car is jerking. When I plug in the idling sensor, especially after driving a few kilimeters and when I unplug it, the car travels well

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: Radiator fans wont turn off unless I turn off the car, why?

It sounds like you have checked just about everything that controls the fans other than the fan power relay itself. As you may know the coolant fan relay turns the fans off and on by receiving information from the coolant...

Q: Car is jerking forward when car is stopped with brake applied.

What you are describing is a real safety concern. You should have your Mustang's brakes checked out right away before you drive it anymore. It sounds like there may also be an idle control issue that is causing RPM's to...

Q: rough ideal. need to know what is the location of O2 sensor 1 bank 2?

This engine has only one bank of exhaust so that helps to make the explanation easier. Your engines exhaust will come out of the engine on either the driver or passenger side. The exhaust parts from the engine to the...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...