Chevrolet Silverado 1500
4.3L V6 EcoTec3 — solid base engine with 250k+ km potential. AFM deactivates two cylinders — lifters are the weak point as with all GM EcoTec3, though less affected than the 5.3L V8. Direct injection without port: valves coke from ~80k miles. Straightforward, dependable truck engine.
4.3 V6 — base engine, honest and simple
285 hp V6: fine for light duty, overwhelmed when towing. AFM lifters less affected than V8. For budget buyers who just need a truck.
Engine Weaknesses 4
Cold start rattle from chain tensioner/guide wear.
Symptoms: Cold start rattle, P0008/P0016 codes
Cylinder deactivation wears lifters — same issue as 5.3L, but less frequent.
Symptoms: Ticking/knocking, misfires, check engine light
High-pressure fuel pump can fail — bad fuel or clogged filters accelerate wear.
Symptoms: Hard cold start, stalling, power loss, engine hesitation
Direct injection without port spray: intake valves carbon up from ~80k miles. Walnut blasting cleans but doesn't prevent reoccurrence. Regular oil changes slow the process.
Symptoms: Rough idle, power loss from ~80k miles, engine hesitation
Vehicle Weaknesses 3
Condenser cracks at weld points — no more cold air.
Strong vibration at 35-70 mph, felt in steering wheel and floor. Causes: aluminum driveshaft, torque converter, transmission fluid. Often from just 20k miles.
8L90 torque converter slip at steady speed. TSB 18-NA-355.