Skip the auto shop - Our mechanics make house calls

Q: My car does not go past 40 kmph while driving

asked by on

Car starts and gears go in but once you accelerate does shift into second gear just hovers around 40 mph
My car has an automatic transmission.

This is a common problem that can be caused by a clogged catalytic converter. If the converter is clogged or partially clogged, the exhaust gasses cannot escape the engine as fast as they should and this chokes the engine. Typically, after driving a vehicle with this problem a few miles, you can look at the catalytic converter and see it glowing red hot.

This is a sure indicator that it is clogged. You must also find the problem that caused the catalytic converter to become clogged as well. Leaking fuel injectors or weak ignition system are among several causes. Consider hiring an experienced technician, such as one from YourMechanic, to inspect the car and determine why it is not getting enough power.

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: Screeching/squealing sound from R Rear

Hi there: In some instances, this type of noise is an indication of a dragging emergency brake, that causes the rear brake pads to slightly apply to the rear rotor. The noise might also be an indicator of bad or...

Q: Engine shuts down abruptly.

Hello. There are several components that could be causing the condition you are experiencing: It is possible that the alternator is faulty and not charging properly There may be an intermittent condition with the crankshaft position sensor...

Q: Manual transmission clutch grinds and won't go into gear

It sounds like what is happening here is that the throw out bearing has failed. This bearing is what the clutch shift fork rides against, which in turn allows the transmission to shift gears. The other possible scenario is that...

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...
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 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.