XJ-S Convertible (XJ27) V12-6.0L (1994)
Throttle Butterfly Valve: Customer Interest
Fuel System - Poor Driveability/Idle Quality
19-36
DATE
10/95
MODEL
XJ12 Sedan 1994 MY
XJ12 Series III
XJS V12
Poor Driveablity - Check Throttle Synchronization
This Bulletin applies to the following vehicles:
All 1994 MY XJ12 Sedan (VIN 673299-708757)
All Series III XJ12 Sedan (up to VIN 487641, 1979-92 MY Canada, 1979 MY USA)
All Jaguar XJS V12
ISSUE:
Poor throttle valve synchronization may cause customer complaints of poor driveablity and idle quality.
An improved factory procedure for setting the throttle stop screws, using an air flow measuring gauge, was introduced during the 1994 MY production of
V12 engines.
An additional revision was made to the method for setting the throttle linkage to improve synchronized opening of both throttle valves starting with:
ENGINE NO.
VIN
8D12554
222252
ACTION:
When diagnosing driveability or idle complaints, check the throttle valve and linkage settings as described in the following procedure before any further
diagnosis or repair.
Perform a road test after adjusting the throttle valves and linkage. If the complaint still exists, refer to the diagnostic procedures in the Vehicle Service
Manual.
SETTING THROTTLE VALVES
NOTE:
The factory throttle stop setting should not be disturbed unless a noticeable fault is present.
1.
Check that both throttle valves are centered horizontally and vertically in the throttle bodies.