Turbo Air Bypass Valve - Updated

FILE IN.: S.I. Man.

VOL.: I

SEC.: B-2

ISSUE: 03/89-1134

SUBJECT:
TURBO AIR BY-PASS VALVE

APPLICATI0N:
900 AND 9000 TURBOS




In early-1989 production, a new design turbo air by-pass valve was introduced on 9000 Turbo models. The new valve (Figure 1) contains a recalibrated spring which helps reduce the effect of pressure surges that can occur in the induction system. The pressure surges can cause "jerky" deceleration and/or a hooting noise.

Turbo Air By-Pass Valve P/N 89 81 904

This valve was introduced in 9000 Turbo production beginning with Vehicle Identification Numbers K1005233 and K2002494. This valve is also a suitable replacement part for 1986 to early-1989 9000 models when repairing a complaint of jerky deceleration or hooting noise.

NOTE:
Valve 89 81 904 MUST NOT be used on 900 Turbo models. Turbo air by-pass valve 93 90 022 should continue to be used on 900 Turbos.

Some early-1989 900 Turbo models were incorrectly fitted with the 9000- specification air by-pass valve. When correcting a complaint of a "hooting" noise in an early-1989 900 Turbo, install air by-pass valve 93 90 022.

WARRANTY INFORMATION:

For warranty claims, use Failure Coding 29153-79-0-01-01. Labor Allowance is Operation No. 29153 (0.2 hour).