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1987 Chevrolet G20 Chevy Van 5.7L Spark Knock
Posted to GM Driveability on 3/17/2002 19 Replies

This van is in with a severe spark knock/detonation on acceleration and seems to be lacking power, the first thing I done was check base timing and electronic spark control system, all checked good replaced ESC module anyway, no change. found occasionally woul...

19 Replies Received (View Replies)

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car Vehicle Data

1987 Chevrolet G20 Chevy Van

VIN 1GBEG25K1H
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
SymptomsSpark Knock
OccursUnder Load, on Accel
Message Closed

car Vehicle Data

1987 Chevrolet G20 Chevy Van

VIN 1GBEG25K1H
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
SymptomsSpark Knock
OccursUnder Load, on Accel