Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Fuel Injector: All Technical Service Bulletins
Multec Port Fuel Injectors - Cleaning
Bulletin:
91-6E-11A
Date:
April '91
Ref. No.:
91-122A-6E
Corp. Ref. No.:
116502R
SUBJECT:
INFORMATION ON MULTEC PORT FUEL INJECTORS/CLEANING
1987-1991 VEHICLES WITH MULTEC PORT FUEL INJECTORS
MODELS AFFECTED:
1987-88 CENTURY MODELS WITH 2.8L (VIN W) ENGINE
1989-91 CENTURY AND SKYLARK MODELS WITH 3300 (VIN N) ENGINE
1988-91 SKYLARK MODELS WITH 2.3L QUAD 4 (VIN D) ENGINE
1988-91 REGAL MODELS WITH 2.8L AND 3.1L (VIN W AND T) ENGINE
This bulletin is being revised to include additional models affected not included in Bulletin 91-6E-11. Replace Bulletin 91-6E-11 with 91-6E-11A.
This bulletin has been written to inform technicians of possible damage to Multec port fuel injectors as a result of cleaning.
The ball and seat design of the Multec port fuel injectors eliminates the need of ever having to use an injector cleaner. By design, the fuel metering
portions of the injector are not directly exposed to the intake manifold gases that are responsible for the build-up of deposits that can cause injectors to
clog. (see Figure 1).
Some of these cleaners may contain high percentages of methanol and other solvents that cause damage to the injectors' coil wire insulation. Damaged
insulation results in low resistance or shorted injectors. Also, high percentages of methanol or other solvents can increase friction at the injectors' critical
bearing surfaces, resulting in premature wear.
