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

1460 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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. get a temp gun and check their temps ... they will all be warm/hot to the touch if the engine is warmed up but if its showing way hotter than the other pullys you may be on to something. the power steering and water pump will have some resistence but they should spin with minimal friction by hand. the idler pullys should spin just as free or slightly better. I have had a few pullys fail on me in other cars and they tend to melt/distort the plastic pulleys as soon as the bearing starts to fail.
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