Q: Rpms Rev to 3000 but car does not accelerate pass 35 mph

asked by on

At first car sputtered a little between 1000 and 1500 rpm. Gas mileage was also bad so I replaced spark plugs. Still a problem so I thought maybe water was in gas. I used a bottle of Heet to try to get rid of water. Still problem existed. A month later stopped at red light began to go when light turned green and car did not want to go pass 35 mph but rpms went high. In the beginning it seemed as though car wanted to breath better. I thought maybe it could be o2 sensor or fuel pump/filter. Someone suggested cleaning fuel injectors or carborator. Any help will be appreciated. Thanks.

My car has 101582 miles.
My car has an automatic transmission.

Hi There, What you are describing sounds like a clogged catalytic converter. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this causes these gases to be backed up into the exhaust system not allowing the engine to breathe properly. When this happens, the engine is forced to work much harder to expel these gases. This often results in the engine bogging down, hesitating, shaking and causing very poor fuel economy. This should also cause a check engine light to come on as the O2 sensors should be reading the incorrect amounts of oxygen in the exhaust gases if this is your problem. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your catalytic converter.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. Rpms Rev to 3000 but car does not accelerate pass 35 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: Wont go into gear shifter goes in gear but wont caught

Hello. If your car will not go into gear the first things I would check are the shifter cable, linkage, and bushings. If there is a problem with any of those three components it may prevent the transmission from shifting...

Q: If it's my alternator how long would that take to replace?

The battery light can come on for a few different reasons in addition to a weak battery. I would suggest having the alternator tested. If this checks out fine and the is still on, also check the voltage regulator as...

Q: With the electronic fan clutch, is it normal to have the fan clutch barely running and that you can keep it from turning with one

Hello. This is normal operation of the fan clutch. The electronics should turn it on as needed. This saves on the power loss that is associated with the fan when it is needed to keep the engine cool. This increases...

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 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...
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.