Supercharger

Asked by Sep 15, 2016 at 04:03 AM about the 1993 Pontiac Bonneville 4 Dr SSEi Supercharged Sedan

Question type: Maintenance & Repair

I got my Bonneville from someone who was sending it to the scrap yard. It
runs and drives great. The body is straight, no rust, good car. It only has
two issues. The "Driver information" screen isn't lit. At night it comes on but
is very dim. How hard is that to fix?
Also the supercharger sounds like it's eating it's own guts at an idle. Take
the idle up to about 1200 and it goes away (as far as MY ears can tell.)
ANy ideas? Some people say it's just cavitation and nothing to worry about,
probably from bad gas. I know nothing about forced induction. So any help
is great!

1 Answer

115

YOUR DIS MAY HAVE A LOOSE OR DIRTY CONNECTION IF NOT THAT MAYBE A SALVAGE PART WILL BE RELATIVELY INEXPENSIVE. SUPER-CHARGER MAY HAVE A BAD BEARING OR TWO. AT IDLE YOU CAN HEAR THE VANES HITTING EACH OTHER. THIS ALSO IS A SALVAGE PART. WHEN THE VANES HIT EACH OTHER THEY REMOVE METAL THAT IS PART OF THE SEAL IF IT DOESN'T SEAL IT WON'T BUILD PRESSURE. CAVITATION IS SOMETHING THAT OCCURS IN LIQUIDS. AS IN A OUTBOARD PROPELLER, AS IT SPINS THROUGH THE WATER AT HIGH SPEEDS IT CREATES WHAT LOOK LIKE BUBBLES. THESE ARE ACTUALLY LITTLE VACUUMS OR CAVITIES, HENCE CAVITATION. IF A SUPER CHARGER WERE ABLE TO CREATE THESE VACUUMS IN AIR YOU STILL WOULD NOT BE ABLE TO HEAR THEM THROUGH THE MASS OF THE SUPER-CHARGER HOUSING. FURTHERMORE IT WOULD BECOME MUCH LOUDER AS YOU INCREASED THE RPM OF THE SUPER-CHARGER.

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