Why does a cold start sound different?
When it is cold, more fuel is added to the air/fuel mixture to make up for the lack of natural vaporisation. So the AFR (air-fuel ratio) is seen by the ECU to be leaner than usual (below the Stoichiometric ratio of 14.7:1) so it compensates for this with extra fuel to make up for the unburned fuel due to the cold.
Do engines sound louder when cold?
Your car runs richer when it’s cold out, or at least until the engine warms up. Richer = louder. It’s noticeable even when it’s warm out.
Why do I hear odd noises in my car?
Modern engineering has made driving a car easier on the ears than ever. But there are some car noises you don’t want to hear, because they can signal trouble. Every once in a while, roll down the windows and start listening for “any sound that is odd,” says Mike Peth, director of technical training at Ohio Technical College in Cleveland.
Why does my car make a grinding noise when I start it up?
The engine can make a grinding noise when it is starting because the oil is not circulating through the engine yet. The oil collects at the bottom and needs a moment to becone warm and properly circulate through the system. Pinpoint where the noise is coming from and then you can determine if you need to take action or not. Was this answer helpful?
Why does my car screech when I start the car cold?
The sound does go a way after the motor is warm. there are no extra vibrations to the car, but I do smell a faint smell like something is burning. My car has 81562 miles. My car has an automatic transmission. When you have a squealing noise on start up, that goes away after a few minutes, is normally a belt issue.
Why does my car make a strange noise when I Turn on the air conditioning?
Some vehicles have multiple belts including a separate one for your air conditioning. If you hear this noise only when you turn on the air conditioning, you’ll know there’s an issue with that belt. It’s also possible that the belt doesn’t have enough tension (either the tension needs to be adjusted or the belt tensioner is worn).