Question about 2006 GMC Envoy
Bad belts bearings ,bad water pump/alternator bearing,sleppery (loose) belt,worn belt,worn pulley.Best guess:timing belt tension bearing,loose alternator -belt slip.
Posted on Oct 21, 2013
Have you checked the tension on the alternator or any other belt drive in the engine bay?
Posted on Oct 21, 2013
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Posted on Jan 02, 2017
There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.
Posted on Mar 22, 2009
SOURCE: Secondary air pump located on frame under driverside on 2004 Envoy makes a loud hih pitched noise after cold start. Goes away after about 5 seconds. Can this be repaired or does it have to be replace
The pump is designed to run when engine is cold to clean up the exhaust, they do make a high pitched noise and this is not abnormal in any way. They are very much like a high speed blower dryer in the way they move air. You can't replace parts in them, they are sold as one unit cost about $210.00 US. A new pump will be somewhat quieter but is it worth the cost and time to replace it? Here is a picture of the
pump. Just click HERE
Posted on Nov 16, 2011
Its vary likely a bearing noise . Eighter the altenator power steering pump air pump or water pump . Although it could also be the belt tenisinor its a big time ware part . Thats what i would look at first .The water pump would be leaking from the bottom . The altenator would be giveing you battery problems charging . The air pump if you have one would show signs in engine porformance . The power steering pump you may not notcce a porformance issue .Its likely the belt tenisioner
Posted on Apr 28, 2012
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