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 MANUALSBUICK1987ELECTRA V6-231 3.8L VIN 3 FIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESPOSITIONSCROSSOVER COUNTS (NUMERIC DISPLAY)
1987 Buick Electra V6-231 3.8L VIN 3 FI
Crossover Counts (Numeric Display)
1987 Buick Electra V6-231 3.8L VIN 3 FISECTION Crossover Counts (Numeric Display)
The O2 sensor voltage fluctuates around a threshold voltage: the value of which is stored in the PROM. A counter within the ECM `counts' the number of times that actual oxygen sensor voltage crosses this threshold to indicate how fast the sensor is oscillating. The crossover count is the a value representing the number of times that the sensor value crosses this threshold in 1.25 seconds. A higher crossover count number indicates a more closely air/fuel mixture ratio.
RENDER: 1.0x
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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.