Skip the auto shop - Our mechanics make house calls

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.

A: Hi there, thanks for writing in, The mass ...

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?

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: Check engine light

This can happen occasionally for a variety of reasons and can sometimes be related to things that can change in the atmosphere such as air temperature and density for example. This can impact something like a throttle body temperature sensor....

Q: Car shaking when accelerating

There are numerous potential causes for the symptoms you are experiencing. However, one thing that comes to mind is the torque converter. The torque converter clutch is usually applied at speeds above 30 mph when the transmission is in 2nd,...

Q: My truck cuts out and jerks when lightly applying accelerator at 45 to 60 mph. If I gas on it hard it doesn't do it

It sounds like you may have either a failing throttle position sensor or potentially a dirty or faulty mass air flow sensor, both of which can cause a bit of a jerking reaction when not functioning properly. The mass air...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...