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Home › Subaru › 1981 › GLF Standard Trans › Repair and Diagnosis › Engine Mechanical › Mechanical › Engine Trouble Shooting › Condition & Possible Cause › Intake Backfire

Intake Backfire

Improper ignition timing.
Faulty accelerator pump discharge.
Improper choke operation.
Defective EGR valve.
Too lean fuel mixture.
Initial choke valve clearance too large.