Five problems related to manifold/header/muffler/tail pipe have been reported for the 1999 GMC Suburban. The most recently reported issues are listed below.
: the contact stated the gas gauge located on the instrument panel failed. Also, while parked in the garage, there was a liquid observed on the floor. The dealership determined the intake manifold was leaking.
1999 GMC Suburban SUV: leaking intake manifold spilling coolant to environment. Engine damaged as coolant mixed with oil and/or fuel. 50k miles, driven by soccer mom to school, practice, church. Epidemic problem per family mechanic performs dozens of these repairs per month. High expense for this premature failre: repair $780.
While driving the vehicle overheated. The dealer determined that the intake manifold was leaking coolant which caused the engine to overheat.
Left rear intake manifold leak. On a 1999 vehicle with only 48,520 miles (light useage for mom and kids) this problem seems a bit premature. My brother who owns a 1998 GMC with about 60,000 miles had simular problem. The part must be defective as both problems are very simular in nature. Cost to fix $700 to $1,000 . Thank you.
#7 spark plug would fail. Also, changed intake manifold & head gaskets. Problem was not intermittent. Happened all time. Took vehicle to shop for repairs & problem still exists.