(F)Moan/Boom Noise

Condition: I

Exhaust moan/boom 2300-2500 RPM range on 1991 vehicles with 3.4L engines (RPO LQ1) assembled prior to VIN breakpoints below:

Marketing VIN
Division Breakpoint

Pontiac MF262219

Cause:

Exhaust system excited by engine exhaust pulse induced vibration.

Correction:

Install exhaust damper, P/N 10199232 (Reference Bulletin # 91-6-35)

Parts are currently available from GMSPO.