Two problems related to engine knocking noise have been reported for the 1998 Buick Lesabre. The most recently reported issues are listed below.
The vehicle was hard to start, consumer heard a pop noise, and the engine started to run rough. Consumer stated maybe a blown head gasket.
Vehicle would not start, there was a pop sound and vehicle started to smoke, consumer pooped the hood and vehicle caught on fire in the engine compartment, claim 38-j837-871.