Question about 2003 GMC Yukon Denali
It feels like the front end is heavy. Poor steering and lack of power. It whines until you let off the gas then it stops. Oil pressure shows a little lower at idle than normal. I have replaced both belt tensioners, both belts, idler pully, and alternator. Help!
it is your idler pulley. get it from dealer comes with bracket, just use pulley off bracket. take your belt off and your idler pulley is lower right hand side(facing your engine). 15mm bolt, replace pulley and reinstall your belt. it;s a common problem on trailblazers
Posted on May 05, 2009
the jerking and noise you are experiencing is the drive chain and bearings in the transfer case also you may want to check the end play in both front and rear pinion bearings and yokes
Posted on Jan 22, 2010
If the whine changes with engine speed in park it could be the idler pulley again or the alternator or waterpump or the a/c compressor you can use a stethoscope or a long narrow screwdriver (2') and put it against a non rotating part and put your ear against the other end and where the noise is the loudest should be the suspect part. Be careful of the fan and belt when doing this.
Posted on Sep 29, 2010
Testimonial: "It was the idler pulley. Sorry it took so long for me to add this post. Thanks for your help."
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