Chevy Siverrado problem

Spook · Jun 23, 2016

I have a Chevy V6 Silverado. I get a vibration and a groaning sound, usually when I am stopped for lights or I am parking. Get the sound even in reverse. If I put it into park, then back into gear, the sound stops, but usually comes back quickly. No engine sound, no noise in park. Any idea what it could be? Its a old truck, just a beater I bought.

Thanks!

Sprint 6 · Jun 23, 2016

Engine mounts are likely shot and the exhaust is too close to the frame, so it lays on the frame and transmits vibration during certain
movements. Pretty common on V6 trucks, they are hard on the mounts.

farmerwithmutt · Jun 24, 2016

Had a 6 great tough motor but like you said always busting motor mounts

Determined · Jun 24, 2016

Lots of things that could cause the symptoms you are describing.
Possibly overdue for a tune-up.
When put in gear the load may be dropping the idle speed enough to cause the vibration.
A bad plug or wire or a vacuum leak is enough to do it.
Loose exhaust hanger, pipe or heat shield.
Some part of exhaust close to or touching frame.
Physically damaged or plugged exhaust pipe, muffler or converter.
Seized fan clutch.
Loose bolts on transmission valve body will allow fluid under pressure to leak which will create a buzzing sound/vibration.
Motor and tranny mounts as others have said.
When in gear and making noise/vibration does it go away if you hold the brake and accelerate slightly?
Watch your tach and see if the RPM is dropping lower than it should be when in gear, this will tell you if your problem is engine related or elsewhere.

Chevy Siverrado problem

Spook

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Sprint 6

Well-known Member

farmerwithmutt

Well-known Member

Determined

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