Electra V8-307 5.0L (1982)
Catalytic Converter: All Technical Service Bulletins
Engine - Poor Performance/No Start Condition
Model Year
1982
Bulletin No.
82-T-124
File In Group
64
Number
42
Date Sept. '84
SUBJECT:
RESTRICTED EXHAUST ON VEHICLES EQUIPPED WITH DUAL BED CONVERTERS
MODELS AFFECTED: 1981 & 1982 EQUIPPED WITH 5.0 LITER V-8 GASOLINE ENGINES (VIN CODE Y)
CONDITION
Some 1981 and 1982 Buicks equipped with an Oldsmobile manufactured V-8 gasoline engine (VIN Code Y) may develop a restricted exhaust due to the
catalytic converter becoming plugged. This can result in poor engine performance or a no start condition.
CORRECTION
Catalytic converter replacement may be required on vehicles suspected of having a plugged converter. With this bulletin, Buick is releasing a new
converter kit package which includes the beads in the upper bed and a plug for sealing the lower bed after installing beads per instructions in this
bulletin. Prior to installing this new converter proper diagnosis of restricted exhaust is essential. The following is a recommended diagnostic procedure to
determine if the exhaust is restricted.
A.
Inspect the exhaust system for damaged or collapsed pipes and repair as necessary.
FIGURE 1
B.
Remove A.I.R. hose at left or right air manifold check valve and remove check valve. See Figure 1. When removing check valve, two (2) wrenches
must be used to avoid twisting off air manifold pipe.
C.
Use a low pressure gauge such as a fuel pump gauge and connect it to the air manifold.
D.
Run the engine at 2500 rpm and note the pressure reading.
E.
Any reading above 1.25 psi indicates a restricted exhaust.
CATALYTIC CONVERTER REPLACEMENT PROCEDURE
If the previous diagnosis indicates a restricted exhaust the catalytic converter must be replaced using the following procedure:
1.
Remove converter using procedures listed in the applicable Chassis Service Manual.
2.
Stand the old converter upright on the inlet end and pour 16 ounces of water into the outlet end to control catalyst dust.
