Fiero V6-173 2.8L (1986)
Fuel Injector: Technical Service Bulletins
Port Fuel Injector - Replacement
Number 87-6(Gasoline)-ll
Date
12/86
Subject:
PORT FUEL INJECTOR REPLACEMENT
1985-87 6000, FIREBIRD AND FIERO MODELS WITH 2.8L V-6 MPFI ENGINE
FUEL INJECTORS
Port Fuel Injector usage for 2.8L V6 engines is summarized as follows:
1985 Model year
(Early)
Bosch injector P/N 5235008
(Late)
Bosch injector P/N 5235210
1986 Model year
Bosch injector P/N 5235210
MULTEC injector P/N 5235136 (Production Option)
1987 Model year
Bosch injector P/N 5235210 (First Generation
Engine Only)
MULTEC injector P/N 5235136 (Second Generation
Engine Only)
During the 1986 model year, a limited number of first generation 2.8 liter V6 MPFI engines were built with MULTEC fuel injectors, P/N 5235136..
This newly designed injector is being produced by the Rochester Products Division and looks slightly different from the Bosch injector. See Illustration
for comparison. The primary difference in appearance between the two injectors is at the spray tip end, and is due to the different fuel metering designs.
Fuel metering in the MULTEC injector is controlled by a ball valve/seat and director plate, while metering control in the Bosch design is done by a
pintle valve and seat.
INJECTOR REPLACEMENT:
FIRST GENERATION ENGINE - 1985-1987 (with a single fuel rail)
Use EITHER the Bosch injector, P/N 5235210, GMWDD Service Package P/N 17111297, or the MULTEC injector, P/N 5235136, GMWDD Service
Package P/N 17111661 (includes appropriate injector retainer for single fuel rail). Replace injectors individually, not in sets.
SECOND GENERATION ENGINE - 1987 (with dual fuel rails)
Use ONLY the MULTEC injector, P/N 5235136, GMWDD Service Package P/N 17111799 (includes appropriate injector retainer for dual fuel rail).
The ECM used with this engine requires the use of this injector only. Replace injectors individually, not in sets.
