⚠️ Kelsey-Hayes 4WAL system introduced late 1987 model year.
Electronic Control Module (ECM)1.2 hr R&Rrelearn only +0.3 hrfuel-injected engines only (TBI 1982+)▸ programming details
📍 passenger side firewall, below master cylinder
🔧 PROM chip replacement
⚠️ Requires physical PROM chip calibrated to VIN/engine. Carbureted engines have no ECM.
High Energy Ignition Module (HEI)0.5 hr R&Rno coding
📍 Distributor cap (integral)
⚠️ Still used alongside ECM for ignition triggering
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 1983 Chevrolet K10 250ci I6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.