Electronic Control Module (ECM)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 passenger side firewall, below master cylinder
🔧 PROM chip replacement
⚠️ All engines TBI or TPI by 1988. PROM must match VIN/engine/transmission.
High Energy Ignition Module (HEI)0.5 hr R&Rno coding
📍 Distributor cap (integral)
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1989 Chevrolet K10 4.3L V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.