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RPM (Revolutions Per Minute)

Hi there. From the description you have given, I believe you are stating that your vehicle has no power, and you are only able get to 35-50 mph and nothing over 1500 rpm. You also stated vehicle runs great, which...

You should make sure that the timing belt and water pump job were done correctly and are not the cause of the other issues you are having. Then the other problems can be checked out if not related. I recommend...

Hi, thanks for writing in. This is a sign of a failing idle air control valve (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-idle-control-valve). This is a unit that is located on or near your intake manifold that monitors the air intake as it is mixed with...

The very first thing to do when you experience power loss or surging issues (https://www.yourmechanic.com/services/engine-idle-speed-is-high-inspection), or interesting gauge readings, is have your vehicle scanned for diagnostic troubleshooting codes (https://www.yourmechanic.com/article/how-to-read-and-understand-check-engine-light-codes-by-jason-unrau). Your car can set these codes and not always illuminate the...

Hello. The throttle cable (https://www.yourmechanic.com/services/throttle-control-cable-replacement) could be sticking causing the RPMs to increase excessively if the throttle cable is holding the throttle open when it shouldn’t be. There also could be a bad throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement) or idle control...

Hi there. This is a common problem for your vehicle. There are many different things that can be effecting your idle rpm. The Idle Air Control Valve for your Vanos needs attention. Vanos is the variable valve timing BMW incorporated...

Hello. If only your tachometer and speedometer aren't working, the problem is probably with the instrument cluster itself. This is because these two gauges use completely different inputs. The speedometer gets its signal from the vehicle speed sensor (VSS), whereas...

There are numerous potential causes for the problem you are having. One thing that comes to mind is a failed engine coolant temperature sensor (https://www.yourmechanic.com/services/coolant-temperature-switch-sensor-replacement) (ETC). The ECT does exactly what it sounds like - it monitors engine temperature. The...

Hello, in your particular vehicle the RPMs and gas pedal are controlled electronically. The accelerator pedal position switch sends a signal to the ECU which sends a signal to the throttle position sensor. The throttle position sensor controls the opening...

On the SC300, when the shifter is in the 3-D position if the shifter is to the right, then the over shift function is enabled. Once the engine reaches a combination of speed and load the transmission will automatically shift...

From the description provided, it appears that you are experiencing transmission problems when accelerating your Mini Cooper. There can be a variety of reasons for this to happen, such as low fluid, a failing shift solenoid or even internal damage...

This is most likely caused by a faulty Idle Air Control valve (IAC valve). This valve regulates the speed of the engine's idle by creating a controlled vacuum leak in the intake manifold. It is also possible that there may...

Hi, thanks for writing in. This may be related to couple of things such as a vacuum leak or potentially an improperly adjusted throttle plate screw. When a vacuum leak is present in an engine, it can cause an imbalance...

With the age and mileage of your vehicle, it would probably benefit from a throttle body service including cleaning the idle air control valve. Over time, oil and carbon build up on the throttle blade so it does not sit...

Hi there. From the description you have given, your vehicle has a combination of problems. The erratic tachometer/rpm gauge (https://www.yourmechanic.com/services/electrical-components-are-not-working-inspection) could be at fault. The tachometer signal from the ignition module could be erratic and may also be the cause...

The idle speed may be elevated due a a large vacuum leak. When unmetered air has entered the engine, the vehicle may try to compensate by adding fuel. The extra air and fuel translate to an increased idle speed. Have...

The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep trying to rev the engine up to compensate. A vacuum leak, sensor that has failed, or an EGR system...

The transmission will most likely need to be replaced. I do not suggest driving the vehicle in this condition as serious engine damage will occur if the engine is redlined too much. A certified mechanic from YourMechanic can visit your...

As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear. When...

A slight drop is RPMs is normal. The windows are operated by an electric motor, which draws from the alternator. As for the gas gauge, that's probably normal, too. I'm assuming you're calculating your fuel range manually, using the trip...