Skip the auto shop - Our mechanics make house calls

Q: Flickering lights

asked by on

The dash lights flicker as do the headlights. The car runs a little rough it has not been tuned could this be the problem?

My car has 210000 miles.
My car has an automatic transmission.

If the idle fluctuates enough, you might see some flicker, because the engine of course drives the alternator. However, the roughness could be a separate issue - that is, the alternator could be failing, too. One diagnostic strategy is to look at the charging system first. If the charging system is working (and the battery passes a standard load test), resolve the poor running condition and that might resolve the flickering lights. As far as the rough running, due to the high mileage, before all else I would test the engine cylinder compression to see what the basic mechanical condition of the engine is. From there (if it passes) there are innumerable ignition and fuel system faults that could be the cause. A YourMechanic certified technician can come to your location to perform a general lights inspection, or a Car idle is rough inspection, in order to diagnose these issues.

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

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: installed wire harness kit causing brake lights to stay on trailer and causing brake lights on car not to work

Hello there, it sounds like something may have shorted out. The brake switch system can only support so many amps of power, and with the addition of the trailer lights, it may have exceeded the capacity and caused the fuse...

Q: Replaced Timing Belt/possible bent valve/misfiring in 3 out of 4 cylinders 2002 Honda Civic

Hello - if the timing belt was not replaced due to failure (and almost certain bent valve damage), it seems unlikely that simply replacing the belt/tensioner, idler, guides, etc. would cause the level of damage that is suggested. If compression...

Q: 2008 Mitsubishi Endeavor won't turn off

Hello. The first place to look is the shift linkage. A shift linkage that is broken or out of adjustment can prevent the transmission from moving through the full range of gears. The shift switch is used to detect the...

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...
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...
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...