Skip the auto shop - Our mechanics make house calls

Q: car accelerates like a full cement truck slow very slow

asked by on

car takes forever to get to 55 mph on flat ground loses up to 20 mph going up a hill if i floor it car makes high rev'ving sound but doesnt increase speed at all. changed sparkplugs and coil packs fuel filter and fuel pump all brand new. no check engine light no vacuum leaks either. transmission fluid looks the right color and doesnt smell burnt and just changed the oil, the new oil only has about 400 miles on it so far. catalytic converter is not clogged nor is any other part of the exhaust system that i know of. no smoke of any kind from exhaust pipe, piston rings and valves should be fine. besides a transmission problem what could cause this? two transmission shops say its not the transmission causing this.

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

From what you’ve described, you could have clogged fuel injectors not giving enough fuel to the engine to produce power to go very fast. I suggest having the fuel injectors cleaned or replaced. The combustion chambers need to be cleaned in order to get carbon deposits off the valves.

If you need some help with this, consider YourMechanic, to get this fixed. A certified technician can help you diagnose your loss of power and help you replace your fuel injector if necessary. Good luck.

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: High mileage and oil grade.

The oil that the manufacturer recommends is 5w30 and it is the only oil that you should use. If you try to use a thicker 10w30 or 10w40 then you may be not lubricating the engine good enough. The thicker...

Q: Dashboard display hard to read - 2015 Buick Encore 2.0 L Automatic

Unfortunately, there is not yet a "fix" for this issue. General Motors is aware this feature is problemmatic for a number of people, but has not created a modification for this.

Q: acceleration is low

Hello, thank you for writing in. A loss of power may be fuel, spark, air, or electrical related in nature. All four of these components can be skewed causing engine malfunction. You will want to make sure the vehicle has...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...