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HOMESERVICE MANUALSPONTIAC1991FIREBIRD BASE, 2D CONVERTIBLE, 3.1 T, 4L60/MD8REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEMFUEL CONTROLFUEL INJECTOR(S)
1991 Pontiac Firebird Base, 2D Convertible, 3.1 T, 4L60/MD8

Fuel Injector(s)

1991 Pontiac Firebird Base, 2D Convertible, 3.1 T, 4L60/MD8SECTION Fuel Injector(s)

Disconnect fuel injector harness connector. Measure resistance across injector terminals at each injector. Resistance should be as specified. See FUEL INJECTOR RESISTANCE table.

FUEL INJECTOR RESISTANCE

Application (1) Ohms
2.0L (VIN K) 1.6
2.2L (VIN G) 1.6
2.3L (VIN A & D) 1.9-2.1
2.5L (VIN R & U) 1.6
3.1L (VIN T) 12.0-12.4
3.3L (VIN N) (2)
3.4L (VIN X) 12.0-12.4
3.8L (VIN C) (2)
5.0L (VIN E) 1.2
5.0L (VIN F) 16.2
5.7L (VIN 7) 1.2
5.7L (VIN 8) 10.0
(1) Injector resistance specification is at 140°F (60°C).
(2) Information not available at time of publication. Solenoid should have resistance; however, infinite resistance indicates an open injector winding.
NOTE: If injectors are dirty, they should be cleaned using approved injector cleaning procedure before performing INJECTOR BALANCE TEST.
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.