Engine Won't Turn Over Due to Coolant Leak From Upper Intake Manifold on Oldsmobile 98

The upper intake manifold may develop an internal coolant leak causing one or more cylinders to fill with coolant. This can cause the engine to "hydro-lock" and not turn over. Removing the spark plugs will allow the engine to turn over pushing the coolant out of the spark plug holes. Replacing the upper intake plenum and gasket is commonly required to correct this condition.

The engine can be very difficult to start after this problem has been repaired, it can be helpful to clear as much of the coolant from the intake manifold and cylinders as possible before reassembling the intake manifold.

RepairPal Verified
Average mileage: (–)
2 model years affected: 1993, 1996
3 people reported this problem
1 person shared problem details
Related Items:
I have made sure there is no air in the hose. The radiator and coolant tank fluid is where it i...
The intake manifold gasket can develop external engine oil leaks. The intake manifold will need...
My car is leaking coolant. Some of it stays in but some of it leaks out onto the ground as I am...
The ABS master cylinder assembly may fail internally causing the ABS light to illuminate.

Related Content