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If its only when the engine is cold its the secondary air injection pump. It pushes air directly in the exhaust manifold to lower emissions. It should shut off after 30 seconds or so
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What is the humming sound while traveling at 1500 rpm in 2002 Chevy trailblazer?
sounds like tire/road noise
My Chevy trailblazer makes a whining noise that increases as the rpm's increase?
it is the idler pully. i just replaced mine and all the whining stopped
What if your Chevy van is making a humming noise in the rear?
The differintial is starting to wear...
What bird makes a humming noise when it flies?
A hummingbird
Why does your car 1985 Chevy Celebrity make a humming soundYou have changed the ignition switch and it worked fine then the car wont start and it makes a humming noise?
when you turn your key and you only hear humming noise, the problem will most likely be that the starter is not engaging the fly wheel, its turning but is not sliding forward to do its job. have the starter check.
What causes excessive road noise on a 2003 Chevy Trailblazer?
Front hubs my be wearing out.
What makes a Truck have humming noise only when driving?
it could be your tires on the pavement.
Why does a tire makes a humming noise?
id say type and size of tire, and if bearings are bad either or will make that humming sound.
What makes a Humming noise in my speakers?
you need a noise filter! go to your local stereo shop and tell em you need a noise filter.
What is the humming noise on drivers side of a 99 Chevy s10?
You are probably hearing the fuel pump, this is normal.
How do you stop a high pitch humming noise from radio when truck is running in 2004 Chevy truck 1500?
humming noise is a bad ground to the radio. you may have a loose connection. connect a ground wire to frame of truck.
2003 trailblazer making whistling noise toward center of engine?
it could be the idler puller rubbing on the bearings. we had to replace it on our 2006 Chevy trailblazer ext.
