Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1987J2000/SUNBIRD L4-121 2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
1987 Pontiac J2000/Sunbird L4-121 2.0L
Computers and Control Systems: Technical Service Bulletins
1987 Pontiac J2000/Sunbird L4-121 2.0LSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- All Technical Service Bulletins
- Engine - THIS BULLETIN HAS BEEN CANCELED
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Electrical - Intermittent MIL/DTC P2138/Reduced Power
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- A/T - Intermittent TCC, MIL ON, and DTC 62/26 Set
- Engine - High RPM Upon Initial Shift Into Drive Gear
- Engine Controls - ECM May Contain Wrong PROM
- TBI Injector - Fault Detection
- Oxygen Sensor Test - Revised Tech 1 Mass Storage CD
- ECM/PCM - Damaged and/or Mis-Diagnosed
- Engine Controls - Damage to Electrical Terminals
- ECM/PCM - Circuit Board Damage Prevention
- Code 43 - Driveability and Emissions Manual Update
- Engine Controls - MAP Chart, DTC's 33, 34 ,63 ,64
- Engine Controls - Static Electrical Damage Precaution
- Engine Controls - Updated Rough/Unstable Idle Chart
- Electronics - Electrostatic Discharge Damage
- ECM - Revised Replacement Procedure
- Glove Box - Rattle
- ECM - Packard 32 Way Connector Identification
- ECM - Packard 32-Way Connector Identification
- Oxygen Sensors - Silica Contamination
- PROM/MEMCAL - Identification Marks
- Electrical - Connector Mislabeled
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • 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.