The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.Google+
Car Problem Reports
GMC 1500 Pickup Intake Manifold Gaskets May Leak Coolant or Engine Oil
GMC 1500 Pickup Problem
Engines Affected: 4.3L V6, 5.0L V8, 5.7L V8, Gasoline
Average Mileage: 153,400 mi (100,000 mi - 206,000 mi)
Visitor, 1997 GMC 1500 Pickup, 5.7L V8, 127,000 mi
coolant in engine oil.
Visitor, 1998 GMC 1500 Pickup, 4.3L V6, 130,000 mi
lower intake gasket leaking in front of engine right behind/below thermostat. coolant dripped onto tranny cooler lines and dripped off of oil pan by drain bolt.
Visitor, 1997 GMC 1500 Pickup, 5.7L V8, 100,000 mi
This was the second set! The first set was replaced at 60,000 miles with the same, problematic AC Delco gaskets. The second setrecently installed are the "improved" Fel-Pro brand gaskets. It is not a matter of "if" the gaslet is going to fail, but "when" is the gaslet going to fail.
Very common on this vehicles, generally you will notice a coolant leak near the front of the intake manifold, above the timing chain cover.
Visitor, 1995 GMC 1500 Pickup, 5.0L V8, 167,000 mi
Coolant leaking at the back of intake manifold on the drivers side.
had to get replaced in serria 1500and suburban 1500 1997
Visitor, 1997 GMC 1500 Pickup, 4.3L V6, 185,000 mi
leaking coolant from driver side gasket at top / replaced
Visitor, 1995 GMC 1500 Pickup, 5.7L V8, 160,000 mi
Hello, it just started leaking at the back of intake manifold on the drivers side.
Visitor, 1998 GMC 1500 Pickup, 5.0L V8, 192,000 mi
intake gasket leaks