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2007 Escalade ESV - Screech noise then engine shuts off at idle

1459 Views 9 Replies 4 Participants Last post by  TecEighty
I have an issue where our Escalade is now shutting off on us randomly at idle. When the engine shuts off, there is a loud screech noise just before it shuts off.

-Oil has always been well maintained and looks good.
-226,000 miles
-Serpentine belt is like new
-Power steering pulley is a little hard to spin and makes a weird noise when I spin it by hand. I’m not sure if that’s normal.
-Water pump pulley doesn’t spin too freely either and also has a noise when I spin it by hand.
-I hear an intermittent whistling noise when engine running that turns into a solid pulley whistling noise once warmed up.

My only thought so far is maybe a pulley is getting ready to seize and it has randomly seized up causing the engine to shut off at an idle? I didn’t think a pulley could make an engine shut off, I thought it would just smoke the belt but maybe at an idle it would? I don’t know what else to think right now.
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Thanks for the replies guys. I’m going to give both suggestions a try and report back.
Well temperatures are relatively close. I took the video above to show the whine/whistle at idle and did a few power steering bumps.
The only other thing that happened (2 days ago, magically before this just happened out of nowhere) was that the shifter linkage cable came loose at the transmission. I rigged up a plastic clip to hold it on. It’s still holding great but I wonder if maybe it’s not fully engaging in drive/park/etc? And it’s causing the torque converter to act funny or lock up maybe??
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