Car vibrates and tachometer indicator goes up and down ac...

Q: Car vibrates and tachometer indicator goes up and down

asked by on February 03, 2017

I noticed my car vibrates gently when it is not in motion. Whenever it starts to vibrate the tachometer indicator moves up and down usually between 0-1. The vibration is now more frequent. What could be wrong.

Thank you


My car has 54400 miles.
My car has an automatic transmission.

Idle fluctuation can be caused by a number of things. A vacuum leak can be one cause. If there is a broken or disconnect vacuum line, broken air intake hose, or gasket leak, the engine can draw in too much air. This effects the air/fuel mixture and can cause a surging idle or even stalling. Low fuel pressure can also be a cause. Either a weak fuel pump or fuel pressure regulator, or even a clogged fuel filter can cause this. Other causes can be one of the numerous sensors the engine control unit relies on for information. If for example, the coolant temperature sensor is not giving the ecu correct information on engine temperature, this can effect the air/fuel mixture and cause an erratic idle. Since any of these components can cause a poor idle, have a certified technician look into the causes to find the exact one.

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

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

What does the Lane Departure System Unavailable message mean?

The Lane Departure System Unavailable message can appear in the driver information center (DIC). When the DIC displays this alert, the lane departure warning (LDW) system is temporarily not working. When the LDW system issue is resolved, the DIC alert...

CV boots leaking

Torn grease boots on the cv joints are a very common problem as the boots deteriorate over time. The boots themselves can be replaced and new grease added to the joint as long as they have not completely dried out...

I need information about the code U 1008 Hyundai

Hi - this error code (U1008) has to do with a loss of communication between the various body system and engine control mechanisms with the "active air flap" system in the front grill/radiator area of the car. This system decides...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Traverse
You You might not always need all of the cargo and passenger space available to you when you buy a 2012 Chevrolet Traverse, but it’s nice to know it’s there. This seven-passenger crossover utility vehicle (CUV) has tons of space...
A Buyer’s Guide to the 2012 Ford Edge
In In the ‘80s, families drove station wagons. In the ’90s and ’00s, those got replaced by minivans and SUVs. Today, more and more families are opting for a more fuel efficient compromise that’s also a little sportier and more...
2012 Hyundai Sonata vs. 2012 Hyundai Elantra: Which One Should I Buy?
Mid-size sedans are a large category. These vehicles are well suited for either a large commuter car that is not going to get quite commuter car statistics as far as gas mileage or a smaller sedan option. Think of mid-size...