1995 riviera supercharged with 91000 miles has a

First off............. It sounds horrible. The bearings are the primary failure point. The supercharger is actually not that prone to failure. I've had several SC 3800's with well over 150,000 miles without an issue. I've lost idler pulleys many times but an actual component failure like the SC./

Yeap your describing a supercharger bearing failure it'll lock up after a while, It can be rebuilt with new bearings but the directions aren't known to me as I've just replased the whole unit. The intake and waste gate gaskets van blow too and you can find the leak with wd-40 or carb spray as when you hit the leak it'll change the way it runs. You may also need to remove the crankcase vents and stop them up to see if you have a leak to the crankcase ( intake gasket leak) The normally assperated engine did this quite alot but theirs few less supercharged ones and I've only changed blown bolwers that won't turn and the cases were so scared up that they could'nt be rebuilt. Oriley shows a unit in thier Knoxville warehouse and it's rebuilt. Find the rattle and fix it and you'll save a ton of money as the repair may seem expensive but the new charger will set you back much more and the work is about the same.

Its usual for the Lambda sensors to cause this if faulty!!

Hello lysiphlebus2,

((My thoughts: cold START valve IAC at very bottom))

Plenty of places will do FREE diagnostic code reads.

I would rather suggest it be a muffler shop than
AUTOZONE... but either is better than guessing.

AUTOZONE will likely make you buy OXYGEN
sensors... (but that makes about as much sense as
buying a new THERMOMETER every-time you
have a FEVER.

What you are describing sounds (from an old
mechanic's perspective) like a collapsing
catalytic convertor or rotted muffler baffle
(a slightly better blockage will halt operation
completely)...

((again speculation... get your codes read))...

Do not buy OXYGEN SENSORS....

Know your prices before waltzing into any
exhaust shop.

AMAZON
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rockauto
1995 BUICK RIVIERA 3 8L V6 Supercharged Catalytic Converter RockAuto

IAC (cold start valve)
1995 BUICK RIVIERA 3 8L V6 Supercharged Idle Air Control IAC Valve RockAuto

Hope this helps

Carnac the Magnificent

Yes. Does the supercharger belt run anything else? I can't remember.

You should also swap the transmission if the motor is going to be more powerful. Also a new computer will be needed for the swap. If you are looking for an easy swap then just find the same motor.

if you are racing the engine up to 4000 rpm in park, you may be hitting the rev limiter - if while driving you have be seeing the start of an ignition problem

not hard....the supercharger is basically a simple component.....there is an aftemarket company offering repair parts a lot cheaper than the dealer...sorry don't remember their name....

you will most probably need a beefed up tranny to take the power of the engine, I have just installed a 350 supercharged chevy motor in my sons car with a Turbo 350 transmission and a shift kit which I have been told by an auto trans mechanic may not take the power of that engine.
It is costing him $1500 australian to have it reconditioned so I hope it will survive the rides

you can not put a regular 3800 intake in place of the 3800 super charged engine,the compression ratio is lower than the regular 3800 engine.......!