Skip the auto shop - Our mechanics make house calls

Q: Car will not go over 40 MPH

asked by on

I first noticed the problem when my Check Engine light came on. At this time, my car could not go over 80 MPH. Over time, the maximum speed dropped to 60 MPH and then 40 MPH. Basically, my car jolts every time I go over 1,500 RPMs. I can switch gears at this point to make the jolting go away, but I am barely reaching 40 MPH in fifth gear. If I try to give it more gas it jolts. Other than that my engine runs good.

A: I have seen this same scenario many times. ...

I have seen this same scenario many times. The problem I believe is from a clogged catalytic converter. When they become clogged they restrict the flow of exhaust gas and the engine can not operate efficiently. I would recommend having a technician, from YourMechanic, to come inspect your vehicle's Check Engine Light and replace your catalytic converter if needed.

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・Save up to 30%

Get a quote

What others are asking

Q: Detached hose

If a hose is detached, I would try and figure out where it may have come loose from. If you are not comfortable, or unable to find where the hose is disconnected from, I would recommend having a professional technician,...

Q: ABS light, brake light, and engine power loss flashing on screen

Hi there, thanks for writing in. This is a typical and common problem with multiple vehicles that have sensors that monitor systems like ABS. The general issue is that when it gets damp and wet, the sensors absorb the liquid...

Q: Gearbox fault warning came on - 2012 Range Rover

Hey there, the battery's low voltage may have been the code they received. You may have to have the body control and transmission module tested for a bad connection and pinpoint tested to see if the gear box fault is...

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...
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...
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...