Those EGR valves are probably stuck open or closed within the first decade of operation.

Unless you're failing emissions testing I'd suggest plugging all related vacuum hoses and ports. Removing the intake manifold on USA M110 sedans is a knuckle-busting operation at best.

When removing the cylinder head for overhaul I leave the manifold attached--it's much easier to dismantle and reinstall on the bench



Tim Kraakevik
kraakevik@voyager.net
630 940-2420