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.

A: Hi - it is quite possible your engine is ru...

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: 99 Accord turns over and fuel pump runs when I turn key, but will not start. What could be the issue? 1999 Honda Accord

Hello - when you say that the lights dim while trying to start the engine, I suspect that the battery may not be strong enough to spin the engine fast enough in low temperatures to catch and run. With your...

Q: Jerking reaction when accelerating

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

Q: Rough idling when the MAF is plugged in

If the problem is present when the MAF sensor is plugged in, this is a classic sign something may be going on with the MAF sensor. Many other things can cause a vehicle to idle poorly as well though. The...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.