Skip the auto shop - Our mechanics make house calls

Q: Car has a little trouble starting but starts. While driving sometimes the lights will dim or my radio will cut off then back on.

asked by on

I have tested the battery and alternator and both test fine.

A: Make sure you have good battery cables and ...

Make sure you have good battery cables and battery terminals as well. Check for any fine cracks on the terminals, which can lead to a loose connection. A faulted sensor like a coolant sensor or air temperature sensor can offer false readings to the ECU and in turn the ECU will send the wrong air-fuel mixture to the engine causing it to start hard or run poorly.

Newer vehicles have a voltage regulator that is integral to the alternator assembly. If the voltage problem is affecting the whole car, this may be the problem. To have all these items checked, I recommend enlisting the help of a qualified mechanic that can inspect the hard start, pinpoint any faults, and perform any repairs that may be needed.

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: no power to radio

The vehicle will need to be scanned using the dealer scanner to access the car communication module to see if it is communicating on the car network and to see if the radio is initialized. This can only be done...

Q: Cooling fan unresponsive and other electrical issues - 1995 Dodge Spirit

Hello. It sounds like you have an issue with a bad electrical connection. Most of the time, this occurs from either a bad connection at the battery or a bad negative battery connection. The negative connections at the body and...

Q: Possible computer problem

Installing a new catalyst will not cause the no start. You will need to have the computer scanned and all the fuses checked. You may have damaged or shorted one of the O2 sensors wires when you did the job...

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 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 to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...