Q: fluctuating idling and slippage

asked by on

Truck started acting as though the transmission was slipping, going down the highway it would fall a gear or would up shift hard but now when it idles it will fluctuate high and low rpms. Doing some research online found blogs that say it could be the master airflow sensor however nothing looks wrong with it found a crack in the radiator so replace the radiator still idling high and low. Possibly going to replace the master airflow sensor but after that I have no idea what to do

My car has 174000 miles.
My car has an automatic transmission.

Hi there, thanks for writing in,

The mass airflow sensor is used by the engine control module to determine how much air is coming into the motor so it can properly decide how much fuel to use for optimal power and fuel efficiency. If the mass air flow is faulty or is giving an incorrect signal, it can significantly affect the operation of the vehicle. It is definitely a possible cause of the issue you described, though it is not the only one. If you want to avoid spending money replacing parts that may not be faulty, I would suggest contacting a professional technician, such as one available from YourMechanic, to properly diagnose your concern.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. fluctuating idling and slippage

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: Q: wheel bearings

If the brake line burst due to corrosion (not unusual), that of course would not be caused by a wheel bearing failure. The most common scenario when bearings fail soon after installation occurs when the installer fails to use a...

Q: Getting squeaking sound from engine.

Hi there. This problem comes up often on this engine. The most common source of this noise is within the timing belt system. Most of the time, this noise occurs when one of the idler pulleys is failing, the timing...

Q: Q: Brake Booster

I think the reason the truck was running rough was the broken vacuum connection and it went to the brake booster. You may have only had partial vacuum to the brake booster before, and now have full assist. You should...

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 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.
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.