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 MANUALSCHEVROLET1989R 20 P/U 2WD L6-292 4.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTPROM - PROGRAMMABLE READ ONLY MEMORYAPPLICATION AND IDREADING TECHNICAL SERVICE BULLETINS
1989 Chevrolet R 20 P/U 2WD L6-292 4.8L
Reading Technical Service Bulletins
1989 Chevrolet R 20 P/U 2WD L6-292 4.8LSECTION Reading Technical Service Bulletins
Always read any Technical Service Bulletins (TSB's) referenced before replacing a PROM.
Service bulletins list parts that must be installed when a PROM is changed, and provide information on trouble codes, troubleshooting and driveability problems for which the PROM was released.
To find applicable TSB's:
Complete TSB Listing
1. Hold down right mouse button and select "Vehicle" in the "Pull Right Menu".
2. Select the TSB ICON.
3. Select "All Technical Service Bulletins by Number, Date, and Title".
4. Select "Sort by Number", "Sort by Date", or "Sort by Title".
5. Scroll up or down to find the desired TSB.
PROM TSB Listing Only
1. Hold down right mouse button and select "Technical Service Bulletins" in the "Pull Right Menu".
2. Select "All Technical Service Bulletins for PROM - Programmable Read Only Memory".
3. Select "Sort by Number", "Sort by Date", or "Sort by Title".
4. Scroll up or down to find the desired TSB.
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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.