backfire at low rpm ,also will not rev from an idle,sputters and backfires. changed fuel pump,filter,mass air.
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1994 Jaguar XJS
Question: back fire
Answer #1DaveJHM June 25, 2011, 23:00Master
I would have the catalytic converter inspected for a possible restriction. Also check for any vacuum leaks or an air leak somewhere.
Answer #2patrick mannion from Greg Solow's Engine Room, June 25, 2011, 23:44Master
Crank shaft position senor failure on that model can do this as well but proper tests for vacuum leaks and looking at key sensor values on an oscilloscope may show what the true problem is.