Exhaust System - Smoke On Startup

91pontiac14

Bulletin Number: 91-6-55
Reference Number: 136007
Publish Date: 11/91


Subject: TAILPIPE SMOKE ON STARTUP (INSTALL NEW VALVE STEM SEAL KIT)


Models 1987-91 FIREBIRD AND GRAND PRIX
Affected: MODELS W/5.0 and 5.7L


This bulletin cancels and supersedes bulletin 88-6-91A issued 3/89 and 88-6-85 issued 12/88. Please discard these two bulletins.

CONDITION: Some owners of the above vehicles may comment on a puff of blue or bluish white tailpipe smoke on startup.

CAUSE: Oil leaking past valve stem seals and being deposited on exhaust valve(s).

CORRECTION: A new valve stem seal kit (P/N 12511890) has been released to address this concern. The kit incorporates a new umbrella seal with a "viton" insert for the exhaust valve stem.

Parts are currently available from GMSPO.

Use applicable Labor Operations and Times.