Skip the auto shop - Our mechanics make house calls

Q: How bad is it for the car if when I accelerate i let it go to higher rpms like 4 or 5?

asked by on

I drive a manual 2005 honda accord with about 170,000 miles on it. How bad is it for the car if when I accelerate i let it go to the higher rpms, like 4 or 5. It goes to 8 with the red starting at 6 1/2

My car has 170000 miles.
My car has a manual transmission.

A: Hi there: On a four cylinder or small six ...

Hi there:

On a four cylinder or small six cylinder engine, accelerating the engine past 4,000 RPM on a consistent basis is not a good idea. The power band on lower gears tops out around the 4,500 to 5,000 RPM range. As a motor ages, the valve guides, cylinder head hardware and other close tolerance items begin to wear out. The higher they are "wound up" by bringing up the RPM past the power band can cause these components to break. Try to shift the car between 3,500 to 4,000 on a normal basis to extend your engine’s life.

Was this answer helpful?

A: Revving the engine to 4,000 or 5,000 RPMs w...

Revving the engine to 4,000 or 5,000 RPMs while accelerating won’t do any damage. That is well below the red line. Once you’ve accelerated to the desired speed, you’ll want to shift into the highest gear possibly that will still allow the engine to run smoothly without lugging. This will provide the best fuel mileage and prolong the life of the engine. Listening to the engine, you will be able to tell when it’s reached the "sweet spot" where it isn’t working to hard, but also isn’t lugging.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: How do you choose a file from a folder’s audio system?

Your car’s radio is capable of playing a number of different disc types, including those with folders (MP3 and WMA files, for instance). Once you insert the disc, here’s how to cycle through the different folders and listen to the...

Q: Hydraulic Fan

If the fan goes to 100 percent but does not reduce speed then the fan control module assembly needs to be replaced as an assembly as no parts are serviceable. A bad power steering pump may pass debris into the...

Q: Odometer not working.

If the speedometer is working correctly and only the odometer is on the fritz, the problem is likely a mechanical failure of the odometer. To fix this the entire instrument cluster would likely require replacement. A trained technician, such as...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.