Q: Motor won't rev past 3,000rpm

asked by on

1995 Mercedes Benz C280 with only 28,000 miles. The motor runs good but it won't go over 3,000rpms. This happens in every gear, including park and neutral. When it reaches 3,000 rpms it bounces like it would if it was redlining. No check engine light so I can't read any code!

My car has 28000 miles.
My car has an automatic transmission.

It sounds like you may have a crankshaft position sensor that may be on the verge of failing. A crankshaft position sensor is an electronic device used to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters. When this is faulty or not working properly, this will cause problems with the ignition system and generating spark transmission to the spark plugs resulting in starting problems and other performance issues causing misfires. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Motor won't rev past 3,000rpm

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: One of my front tires is angled different now that I hit a rock. Could an alignment fix it? 2007 Mercedes C230

Hello - you are correct, an alignment is not going to properly repair this damage. There may be a bent or otherwise damaged suspension control arm (lower) or tie rod. I recommend a steering and suspension inspection performed by a...

Q: My car rattles when I start it up but stops after that

If the noise started immediately after your new starter was installed, the noise may relate to the installation and/or the starter might be defective. Normally, the supplier warrants the part, and labor, so you should check to see if there...

Q: The car shutters, has difficulty accelerating

The flashing Check Engine Light indicates a fault that has the potential to damage the vehicle's catalytic converter. The car flashes the Check Engine Light to let you know that the car should be checked as soon as possible. Catalytic...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...