Originally Posted by Lime
Are you referring to the link posted above when you say that, or is there another way? I'm just curious as to different ways to go about this.
EDIT: That link describes how to fix the EGR and the gasket, but what exactly happens? What, if any, is GM'* official fix for this? And aside from the gasket and a fix like this, what else is required?
It may be a failure of the plastic upper intake manifold (described in the above referenced thread) or it may well be a failure of the gasket between the cylinder heads and the aluminum intake manifold. Both are well known to fail. Normally, you should not fix one without fixing the other.
To answer your question, GM'* "fix" is to sell you a new plastic upper and sometimes a new lower intake manifold, replacing all the gaskets and giving you another 40-60,000 miles of trouble-free service for $800-$1700.
There have been recent advances in gasket technology that we hope will fix the lower gasket failure problem. (see this thread: http://www.bonnevilleclub.com/forum/...ic.php?t=33945
). This thread also discusses replacing the Series II plastic upper with a Series III aluminum upper and using an adapter for the throttle body.
If you do the work yourself, using the low-cost EGR fix, you can "git-r-done" for about $100. That'* figuring $40 for the lower gasket, $40 for the upper gasket, and $20 for JB weld, a pipe, and a sleeve. If you replace the upper, add $110. (The upper comes with gaskets for $150.) If you have the upper sleeved, add $40. If you have the work done at a (non-dealer) shop, maybe about $4-500.
Because this is such a common problem, you have a wide range of options.
IMPORTANT: Coolant is harmful to the bearings in your engine. To minimize damage, drain the oil and the coolant. Change the oil filter, put in some new oil, unplug the ICM so the car won't start without coolant, and turn the car over until oil pressure develops to try to flush any coolant from your engine bearings.
EDIT: Hopefully, you did not suffer any additional damage from the hydrolock when you tried to start it. Sometimes, the starter can be damaged or a connecting rod can be bent if one or two other cylinders fire first, pushing the piston with some coolant up into an uncompressible position. If that happens, the fix ain't so cheap.