Air Management (A.I.R.) System - Moan or Chirping Noise

Bulletin No. T 86-48
File in Group 6E
Number 26
Corp. Ref. No 805 5667
Date April '86
SUBJECT: MOAN OR CHIRPING NOISE FROM A.I.R. SYSTEM DUE TO CATALYTIC CONVERTOR CHECK VALVE

MODELS AFFECTED: 1982-84 DE VILLES, FLEETWOODS AND '85 FLEETWOOD BROUGHAMS EQUIPPED WITH HT4100 ENGINES

Some 1982-84 De Villes, Fleetwoods and 1985 Fleetwood Broughams equipped with HT4100 engines may exhibit a moan or chirping noise from the A.I.R. system at idle due to the catalytic convertor air injection check valve. A malfunctioning check valve can be identified by pinching off the rubber hose which feeds air from the air switch valve to the catalytic convertor. If the noise stops when the hose is pinched, replace the catalytic convertor air injection check valve with P/N 22048209. The new part should be black with a white dot painted on it.

For warranty purposes use labor Operation J6086 for .3 hrs.