Fuel Cut-Off Specifications - Revision

9224buick04

Bulletin:
91-6E-16

Date:
April, '91

Ref. No.:
91-151-6E

Corp. Ref. No.:
116508


SUBJECT:
SERVICE MANUAL UPDATE/SECTION 6E3-C2-DRIVEABILITY/EMISSIONS
(REVISED FUEL CUT-OFF SPECIFICATIONS)

MODELS AFFECTED:
1990 - '91 REGAL WITH 3.1L ENGINE (VIN CODE T)


This bulletin revises the fuel cut-off specifications for the 1990-1991 Regals equipped with 3.1L (VIN T) engines.

To prevent possible engine damage from over-speed, the Electronic Control Module (ECM) "cuts-off" fuel from the injectors when engine speed is above approximately 6200 rpm with the vehicle in any forward gear or reverse, and approximately 4000 rpm in park or neutral. To prevent tire damage, the ECM also has a fuel cut-off in excess of 100 mph (161 km/h) based on speed rating of the tires.