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03-10-2009
the car drives fine
doesnt happen all the time
but my engine has a knocking sound
its not tapping either
it comes from under the hood
and when i open up the hood its hard to find where its coming from
anyone have ideas on what that might be??
and when i roll down the windows my rpms drop??
03-10-2009
it is probably your supercharger coupler. it is worn, when you stop, it sounds like rocks in your engine? if you take it out of gear, it usually gets quieter...
youtube...explanation...watch
YouTube - Replacing a worn out supercharger coupler on 3.8 GM engines
03-10-2009
Your rpm's drop when you roll down the windows...that sounds electrical...like your alternator might be taking a s**t on you...I'd have that and the battery tested too...not sure about the ticking though...might try that Lucas stop tick stuff from Slow Riellys or Advanced...and if it cures it up then you have valvetrain issues...
03-11-2009
thanks. i guess ill do that.
at first i thought anything dealing with the supercharger was complicated. guess not
and yea the alternator does seem like it does that.
i cant have the heat or a/c on blast while listening to my radio cause the lights dim or you hear the blower motor dropping from high to low at times.
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