EXPERTEC TSB (T88-26)

Publication date: 1987-09-18
Reference number: T88-26

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): T88-26, Date of Issue: September 18, 1987

THROTTLE BODY TO MANIFOLD GASKET REPLACE/IDENTIFICATION

Model(s): 1988 Cadillac DeVille, Fleetwood, Eldorado & Seville

Bulletin No.: T88-26

Date: September 18, 1987

SERVICE INFORMATION

With the introduction of the 4.5L V-8 engine for the 1988 model year, revisions in the throttle body bore diameter have dictated changes in the throttle body to intake manifold gasket. The diameter has changed from 35mm for the 4.1L V-8 gasket to 43mm on the 4.5L V-8. See Fig 1 .

Care should be taken in service of the gaskets as they are very similar and could mistakenly be interchanged. Interchanging of the gaskets may result in poor emissions and low fuel economy. The 4.5L throttle body to manifold gasket has an identification tab to help distinguish between the 4.5L and 4.1L gaskets. In the car, this tab is visible when looked at from over the top of the I.S.C. motor.

Fig 1: 4.5L & 4.1L Throttle Body To Manifold Gasket