Skip the auto shop - Our mechanics make house calls

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?

A: There are several possibilities that can ca...

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?

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: Disconnected shift linkage

Hello. It would first be necessary to determine where the shift linkage is disconnected. It can be disconnected at either the shifter or the transmission. Next, an inspection of that area will be necessary to determine the cause of the...

Q: Car keeps stalling car, I think it's the fuel pump

Hello - I applaud your diagnostic skills! You have certainly identified a classic failure mode of a fuel pump with extended mileage such as yours. Your fuel pump is located in the tank and is cooled by the gasoline there....

Q: Windows not working.

If none of the windows are working from any of the switches, there must be a common circuit problem. The first thing I would do is check the fuse. Fuse information can be found in your owner's manual. If the...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...