Skip the auto shop - Our mechanics make house calls

Q: My car won't go faster than 70 mph

asked by on

When I'm on the highway I put in fifth gear and try to floor it but the car like jumps and stays at 70 mph no check engine light I replaced the 02 sensor Cause the check engine light went on before but it didn't seem to do anything please help

My car has 152000 miles.
My car has a manual transmission.

This is a common sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit that monitors the air intake as it is mixed with fuel prior to being supplied to the motor. When this is not working properly, this can cause the motor to hesitate and jerk a bit as you describe as a result of the unbalanced air/fuel mixture provided to the motor.

I would recommend having a professional mechanic, such as one from YourMechanic, come to your location to determine why the car is jerking at high speeds and suggest any needed repairs.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Car was at 20k and brake lining was at 6mm car is at 25k. Do they need replacing?

Yes, at 6mm it's time to replace the brake pads. 24000 miles is a little early for brake pads, but it depends a great deal on your driving style and what kind of driving you do most often. Most of...

Q: Car has been sitting without gas for about a month and now when I try to start it, the starter works 100% but the car wont turnove

Hi there. It is possible that the lack of fuel in the tank may be causing the pump to have difficulty picking up the fuel. However, it is more likely that the fuel pump may be damaged, especially if there...

Q: Minivan shutting down; cleaned IAC

Hello. It is possible that cleaning the Idle Air Control (IAC) valve would fix this problem permanently. However, because it is not likely that all of the dirt was cleaned out the IAC valve it may fail again. It would...

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...
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...