Exhaust System - Loud Booming Noise at 1500 RPM
Bulletin 84-6F-2Date May '84
Ref. No. 84-222-6
SUBJECT: 1500 RPM BOOM
MODELS AFFECTED: 1982-84 CENTURY AND SKYLARK VEHICLES
WITH 2.5L (VIN CODE R) ENGINE (INCLUDING WAGONS)
Condition
Some 1982-1984 Century and Skylark vehicles equipped with the 2.5L engine may exhibit a loud booming noise at 1500 rpm.
Cause
This condition may be caused by the catalytic converter hanger being preloaded.
Correction
To correct this condition the following procedures should be followed:
1. Remove the load from the catalytic converter exhaust hanger.
a. Loosen the converter and manifold flange joint bolts.
b. Break the converter joint loose.
c. Retighten the bolts to 20-40 N-m (15-30 ft.lbs) while holding the converter up against the heat shield.
d. Make sure the distance between the upper and lower converter hanger rivets is less than 62 mm.
CRADLE DAMPENER ASSEMBLY:
2. Install a newly released additional cradle dampener assembly (See Illustration).
PART NUMBER DESCRIPTION
22527158 Dampener Assembly
10021800 Bolt
Do not remove the existing dampener.