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・Fair and transparent pricing

Get a quote

What others are asking

Q: I have a stutter when I am driving

The stutter, or vibration, could be due to an engine management (tuning) issue or is possibly caused by worn motor mounts that are allowing engine vibration to transfer to the body when the engine is under load. To evaluate the...

Q: EPC Light

Hello, thanks for writing in about your Volkswagen Jetta. This is a common issue when the mass air flow sensor is failing or the throttle position sensor is faulty. This will cause the intermittent hesitation and spikes in RPM's as...

Q: Car would self stall even in neutral

The fault codes should be read out to determine the exact nature of the fault. I believe the mechanic you consulted was talking about the camshaft timing solenoid. While this could cause a stalling to occur when coming to a...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.