Operation CHARM
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Jaguar
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1992
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XJ-S V12-5.3L
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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Backfires and Afterfires
Backfires and Afterfires
Fuel ignites in the intake manifold, or in exhaust system, making a loud popping noise.
POSSIBLE CAUSE
ACTION
Air management valves,
Check Air Injection system.
check valves malfunctioning
Refer to
TESTING PROCEDURES.