Skip the auto shop - Our mechanics make house calls

Q: Why does my tachometer not stay at zero?

asked by on

When I turn my car on it never stays in zero, always goes at the number 1 most of the time, what should I do?

My car has 88000 miles.
My car has an automatic transmission.

A: Hi there. The tachometer on your 2007 BMW 3...

Hi there. The tachometer on your 2007 BMW 328i is designed to measure the revolutions per minute (RPM) of the engine while it is in operation. Anytime the engine is running, the engine will idle (without the use of the accelerator pedal) at a predetermined RPM. Usually, most manufacturers set their idle from 800 revolutions per minute to 1,200 RPM. On the gauge, every solid number (1, 2, 3 and higher) is measured as 1,000 RPM. So if your tachometer goes to number one when you start your car, it's working perfectly. Hope this helps.

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・Save up to 30%

Get a quote

What others are asking

Q: Best beginning upgrades

Hello. You would get the most power increase by a performance exhaust system in most cases. The cold air intake will also give some increase, but only on the better performing expensive units. You will need to search for deals...

Q: IDL - RPM is higher then normal

You should first check to make sure you do not have any vacuum leaks. Scan the computer and diagnose any service codes. If you do not have any codes, then you may just have to relearn the idle of the...

Q: Check Engine Light is on and I am getting codes P2600, P22aa, and P24aa

Hello. The codes you have provided are related to the engine and emissions systems. P2600 appears to be related to an issue with the engine's coolant pump circuit. This model of vehicle uses an electric water pump. The computer will...

Related articles

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...
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...
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...