FUEL INJECTOR PLUGGING PFI ENGINES. Pontiac Firebird 1986

VEHICLES AFFECTED: 1985-86 'F' CARS WITH PFI ENGINES (ENGINE CODE F) 1985-86 'Y' CARS WITH PFI ENGINES (ENGINE CODE 8)

In response to GM's request for high-detergent fuels, almost all gasoline marketers now provide fuels which should prevent injector plugging. In addition to improved fuels, G.M. has released fuel injectors with increased resistance to plugging. The following steps are recommended to service port fuel injection conditions:

To correct injector Plugging:

(all Models and years)

1. Clean injectors, using tool J-35800. 2. Recommend the use of high-detergent fuel.

Any additional occurrences (1985-1986)

Injectors more resistant to plugg.ing have been released in 1987 fuel rails with date codes after 12-5-86. These injectors cannot be used in 1985-86 manifolds. However, improved service injectors are available for 1985-1986 vehicles that continue to have injector problems. These 1985-86 service injectors are of a different manufacturer and must only be used in complete setsof eight. The following chart provides correct part numbers for service applications:

INJECTOR PART NUMBERS

REPEAT YEAR AND MODEL STD. SERVICE PLUGGING -------------- ------------ -------- (Use as Req'd) (Use only in sets of 8 and only for plugging)

1985-86 'F' 5.0L 17110872 10077513

1985 'Y' 5.7L 17110870 10077514 Requires increased fuel pressure: 17110874 Fuel Regulator 17110860 Cold Start valve

1986 'Y' 5.7L 17111418 10077514

1987 'F' 5.0L 17111960

1987 'Y' and 'F' 5.7L 17111961

Use applicable Labour Time and Operation Number.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.