☰
GET A QUOTE

Q: Car revs up but does not drive faster than 40 mph on a flat road.

asked by on January 28, 2017

I replaced the catalytic converter at about 150000 miles. Drove about 300 miles check engine light came on. Went to AutoZone scan said probably a bad upstream oxygen sensor. Replaced both sensors and light went out. Got gas one day and check engine light came on again. AutoZone said it was probably the gas cap. Replaced cap and reset light. The other day I pulled out and car died. Got it started back but it won't do over 40 on a flat road. Engine will rev but the car slows down. Any idea what might be wrong? The check engine light is not on so I am puzzled. Thank you.

My car has 163000 miles.
My car has an automatic transmission.

Recommended Services

Gears slipping when accelerating Inspection $94.99 - $114.99 Get a Quote
Or For Any Other Auto Repairs Get a Quote

Hi there. For the engine revving up and the vehicle slowing down, the transmission could be slipping. Check the transmission fluid and see if its full and red in color. If the fluid is full, then the transmission could be slipping while in gear. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transmission.

Hyundai
Sonata
V6-2.7L
2002
automatic transmission
revving
slipping
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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Fluttering noise when accelerating
The noise you are hearing is most likely a broken door or window seal that is letting air into the passenger compartment, causing the fluttering you are describing. I would suggest having a certified mechanic run a noise inspection (https://www.yourmechanic.com/services/car-is-making-a-noise-inspection)...
Read more
Car won't start after someone tried to steal it
Two systems in the column need to work for the engine to start. The ignition switch, and the anti-theft system. Your car has some version of the Passlock anti-theft. The ignition switch reads a specific resistance of your key and...
Read more
The battery light turn on when it rains and steering wheel gets jammed for a few seconds. Then battery light turns off it works
This is most likely caused by the serpentine belt slipping. You need to have the belt and tensioner checked for problems and have them repaired as needed. If you need further assistance with this repair, a certified technician from YourMechanic...
Read more
Temperature gauge going up and down
Hi there. The issue is the thermostat. It is sticking about half way and not opening all the way up or it has a lot of calcium buildup. I recommend replacing the thermostat (https://www.yourmechanic.com/services/thermostat-replacement) and flushing the coolant out (https://www.yourmechanic.com/services/cooling-system-flush)...
Read more
I was driving down the road and my truck was running poorly then died. It will crank but not start.
Hi and thanks for contacting YourMechanic. Check the air filter (https://www.yourmechanic.com/services/air-filter-replacement) for it is not dirty. It may sound silly, but if the air filter is dirty the engine will not start up. Starting fluid produces its own oxygen so...
Read more
P0483, with engine overheating.
Hello. P0483 is the trouble code a "Cooling Fan Rationality Check Malfunction. If the computer detects a discrepancy between the cooling fan's commanded state of operation, versus the actual state of the circuit, it will set off this code to...
Read more
When installing a new water pump and thermostat on my 1989 Pontiac grand Prix should I use gasket sealer or silicone grease
In your application, the new thermostat comes with a new rubber seal which is the entire gasketing solution for the thermostat housing. Nothing should be added as that may interfere with the seal. The water pump uses a paper/fiber gasket....
Read more
Why does my car "skip" when I accelerate from a complete stop
Hi there. Typically when an engine 'skips' it is due to an ignition misfire. All combustion engines have a firing order in which each cylinder is designed to complete the combustion process in a certain order. The "skip" occurs when...
Read more
P0446
Hi There, These codes all relate to a leak in the Evaporative Emissions system (EVAP system). Your car has a small purge valve with a purge solenoid (https://www.yourmechanic.com/services/evaporation-vent-solenoid-replacement) in the Evaporative Emissions system that controls the venting of fumes from...
Read more

Related articles

A Buyer’s Guide to the 2012 Hyundai Azera
The The Azera offers an overall good value for the class and price point. The sleek styling is hard to overlook – for a large sedan it’s about as eye-catching as they get. This Hyundai also boasts respectable power that’s...
Read more
The Best Used Cars to Buy If You're an Uber or Lyft Driver
Are Are you thinking of becoming a driver for Uber or Lyft? That could be an exciting career change – you’ll get to meet a lot of interesting people, and if you love to drive, what better way to spend...
Read more
The Best Used Cars to Buy If You Have 3 or More Kids
If If you have three or more kids, you could probably get by with a mid-size sedan if all you want to do is take them from Point A to Point B. Realistically, though, having kids means music lessons, athletics,...
Read more

Browse other content

Cities
Services
Cars
Estimates