Q: Gas stops flowing above 25 mph & can't accelerate

asked by on

My car will start properly, but once driving it won’t go more than 25 mph. Once it reaches 20-25 mph, the gas will stop flowing and I can't accelerate until it goes back below 20 mph. I thought the problem might be the fuel filter, so I replaced it, but that was not the solution. Can you help me by giving a diagnosis and what will solve this?

There are several possibilities that can cause an engine to fall on its face when it hits certain RPM ranges. It could be a fuel delivery issue, air issue, or an input sensor such as a crankshaft sensor or mass airflow sensor setting injection timing incorrectly.

Fault codes need to be read out first to see what obvious issues might be present and those items corrected. Vacuum leaks and unmetered air leaks need to be sought out as this can cause lean misfiring and issues on acceleration.

Crankshaft sensor signal needs to be looked at as well, if the signal is not clean, it will cause issues at higher RPM’s and cause ignition and injection to cease. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the equipment and expertise to diagnose and correct this acceleration 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. Gas stops flowing above 25 mph & can't accelerate

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: I am leaking coolant only sometimes. 2002 vw passat.

Coolant leaks can be very tricky because they might happen only under certain conditions. Some leaks may only occur when the engine is cold, while others might only show when the engine is hot. some may be low pressure leaks...

Q: Starter keeps going after car is on. When i turn the key just to see the dash the car starts and it keeps trying to start.

Hi Omar. Thanks for contacting us tonight. The starter problem you are describing is probably the starter solenoid, a power switch (integrated into the starter assembly) that takes a small current from the ignition switch and engages a large current...

Q: Q: Gas tank leaks

Hello, sorry you're having problems with your gas tank. It might just be a loose or damaged filler hose that is leaking and needs to be replaced. I would recommend having a technician from YourMechanic come out and inspect the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.