Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA, NORMAL VALUES AND DEFINITIONSSCAN TOOL DATA DEFINITIONS - POWERTRAIN SYSTEMSMISFIRE CURRENT CYL. #1 - #6
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Misfire Current Cyl. #1 - #6
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Misfire Current Cyl. #1 - #6
Range (Current Counts)
The scan tool displays the number of misfires detected during each 200 crankshaft revolution sampling period. Each cylinder has its own register to record misfires that have occurred. If the Misfire Current Cyl is incrementing, it will be reset to zero after 200 crankshaft revolutions. If the misfire DTC has set, the number of misfires in the register will be added to the Misfire History cyl register each time the current cyl. register is reset to zero.
The scan tool displays the number of misfires detected during each 200 crankshaft revolution sampling period. Each cylinder has its own register to record misfires that have occurred. If the Misfire Current Cyl is incrementing, it will be reset to zero after 200 crankshaft revolutions. If the misfire DTC has set, the number of misfires in the register will be added to the Misfire History cyl register each time the current cyl. register is reset to zero.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.