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Volvo
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1998
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S70 Base, Automatic
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Repair and Diagnosis
›
Engine Performance
›
System
›
Engine Controls - Tests W/O Codes
›
Symptoms
›
Poor DRIVEABILITY
›
Knocking
Poor DRIVEABILITY: Knocking
Check ignition and coil circuit.
Ensure spark plugs fire strong Blue/White spark.
Check knock sensor.
Check throttle switch and connector.
Check ignition and coil circuit.
Check engine speed sensor.