One problem related to oil pump has been reported for the 1999 Chevrolet Venture. The most recently reported issues are listed below.
1 inch of sludge in engine, lost of coolant, the engine pinging and knocking, steering and brakes locked up which caused the accident while driving. We changed the oil pump, oil connecting rod, spark plugs, spark plug wires, coils and still engine is broken. Started with coolant in the oil. Unsure symtoms leading up to the accident.