Skip the auto shop - Our mechanics make house calls

Q: Truck jerks trying to change gear around 45mph

asked by on

When driving around 45mph i feel a jerk motion from the truck . like its trying to change the gear . would have to floor it for it to change gears . what can be wrong with it so it can stop?

My car has 160743 miles.
My car has an automatic transmission.

A: This may be a sign of a dirty or failing ma...

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 into the motor. When this is dirty or faulty, this causes an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel. I would suggest having a professional from Your Mechanic come to your home to diagnose your mass air flow sensor.

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

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: Bad camshaft position sensor?

Hi there. You might find reading this article very helpful in trying to diagnose your P0016 OBD-II trouble code issue. It explains common causes, symptoms and solutions.

Q: The rear main seal leaking off a '99 F-150 4.6

The actual fix of taking the seal in and out once you are there is easy, but the problem is that you've got to move the transmission off to get to it. So, if you are willing to do...

Q: Car cuts off when i take my foot off the gas just started happening right after i put gas in it

This is a common problem which often is related to the mass air flow sensor. This is a unit that regulates air intake as it is mixed with fuel prior to being injected into the engine. When this is not...

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 Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.