Question about 1996 Buick Riviera

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Water leaking from rubber elbow on intake manifold passenger side of motor

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It could be the intake gaskets, or it could be that the upper intake is starting to fail. Both are common problems. How fast are you losing coolant? If it's fast, then it may be the upper intake. Also, how many miles are on it, and has the upper intake been replaced before? It may be due for a new one.

Anyway, the procedure for doing the gaskets and for replacing the upper intake are exactly the same, except that if you replace the upper intake, you put on the new one instead of reinstalling the old one. I've done this with mkaake over a couple of days. There's a lot to remove and replace, but nothing that's especially hard to do. Have a service manual of some kind on hand, and do some serious research before you take it apart.

Parts you'll need:

1) Upper intake gasket set
2) Lower intake gasket set (make sure it's the new upgraded version, with metal inserts)
3) Plastic coolant elbow (it's under the alternator, and rarely comes off in one piece. It's also a dealer part, so if you're doing this on a Saturday and the dealer is closed... you get to wait until monday to put it back together - unless you get one ahead of time)
4) Fuel injector O-rings (might as well replace those while you've got them out anyway)
5) Carb/TB cleaner - several cans (you'll want to clean up the upper and lower intakes, and the TB while you've got them off)

That's all I can think of right now. I also don't know prices. Maybe someone else will have that info.

Posted on May 17, 2011

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