Fitment notes: 454ci V8 requires heavy-duty battery; side post terminals standard on GM trucks
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Every control module on the 1981-1986 Chevrolet K20 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Physical PROM chip must be transferred from old ECM or replaced with correct calibration. Carbureted models have no ECM.
Electronic Spark Control Module (ESC)0.6 hr R&Rno codinggasoline engines with ESC knock sensor system
📍 driver side firewall near brake booster
⚠️ Non-programmable knock control module, separate from ECM on equipped models.
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 1984 Chevrolet K20 454ci V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.