Q: Problem with speed. No check engine light on but when accelerating speed, it decreases then speeds right back up. No stalling at all

asked by on

Problem with speed. No check engine light on but when accelerating speed, it decreases then speeds right back up. No stalling or stopping at all

My car has 147564 miles.
My car has an automatic transmission.

Hi, thanks for writing in. This is a common problem associated with fuel/air delivery which is very commonly related to what is called a mass airflow sensor. This monitors the flow of air intake into the throttle body as it is mixed with fuel to deliver the right air/fuel mixture into the motor. When this is not working properly, this will cause this kind of hesitation or surging when trying to accelerate. I would recommend having an expert from YourMechanic come to your home or office to confirm a diagnosis on the issue and make or suggest the necessary repairs or replacements.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Problem with speed. No check engine light on but when accelerating speed, it decreases then speeds right back up. No stalling at all

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: Whisting noise when increasing or decreasing speed

There is a tensioner pulley that keeps the correct amount of tension on your serpentine belt. When these bearings wear out, they can cause this type of a whistling sound that you describe. This is a quick fix and should...

Q: I replaced my engine of w221 s350 with this engine 272 946 31142350 they told me its for glk 350 2011 model how can I tell if thi

Hi there. Your best bet is to contact Mercedes-Benz dealership and speak with their service or parts department to get the information you're seeking. We offer general automotive tips and maintenance / service recommendations for our site visitors. Thanks. ...

Q: About every 5-10 minutes while driving, since start up, the "Oil Pressure is low" icon comes on, but goes away.

Hey there. The oil pan being replaced should not impact the oil pressure unless there was not sufficient oil put back into the motor after replacing the pan. I would suggest checking the oil using the dipstick to be sure...

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...
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...
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.