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!
  1. Home
  2. Questions
  3. My car won't go faster than 70 mph

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: Cost to restore the tires to original setting

The cost to restore your suspension to stock condition can vary greatly. Your geographical location can affect parts pricing and availability, labor costs, etc. The most accurate way to price this would be to have the vehicle inspected by...

Q: Low rpm idle

Since you had the battery disconnected the computer needs to relearn the idle again. I would recommend having the throttle body cleaned and then the throttle relearn process done so the idle can stabilize and be relearned by the computer....

Q: Hi good day, how many spark plugs and spark plug wires do i need for a 2005 Kia Sorento LX?

Hi there. Since you have the V-6 engine option for your Kia Sorento, the correct amount of spark plug's needed and spark plug wires is (6) - one per cylinder.

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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 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...