Skip the auto shop - Our mechanics make house calls

Q: When am driving,especially above 15km/h and then step on the clutch,the rpm starts varying from 1000-3000.what can cause that

asked by on

I used to have bad idling,i cleaned the air intake valve.After like a week of driving,i noticed that when i step on the clutch on high speed especially when the car is on gear,the RPM starts to fluctuate from 1000-3000 which then stabilises when i disengage the gear.what can be the problem

My car has 400 miles.
My car has a manual transmission.

This can happen when the idle air control valve is dirty or not working properly. This is a unit that monitors the air/fuel mixture at idle speed. This can also happen when the mass air flow sensor is not working properly. This monitors the air/fuel mixture at higher speeds, but can cause a similar symptom when you are at higher RPMs. I would recommend having an expert from YourMechanic come to your home to diagnose and repair the idling 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!
  • Home
  • Questions
  • When am driving,especially above 15km/h and then step on the clutch,the rpm starts varying from 1000-3000.what can cause that

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: car accelerates on it's own

Hello, thank you for writing in. With some further investigation, you will see that there is a problem with Toyota and their hybrid vehicles pertaining to sudden acceleration or stopping. You will want to contact the service department again and...

Q: I have a 2011 Ford Fusion that has a tap/knock while idling. Normal for this motor?

Hi there. Typically this is normal for this engine. The design of the valve train causes this engine to make more noise than a lot of engines, but it does not create any issues. The fuel injectors tend to also...

Q: Car won't go into gear.

If the pedal is going all the way down and the shifter is hard to put into gear, then the clutch is not disengaging. Go under the vehicle and see if the clutch fork is moving all the way when...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...
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.