Hello all,
I have a 1994 Cavalier with the 2.2L engine, 97K miles. Recently it has started to knock & ping, and the fuel economy has dropped 15-20%. No other symptoms present, and no change in driving style/conditions.
I've been told it could either be a faulty EGR valve, or a plugged catalytic converter. I changed the spark plugs, no effect. Any thoughts ?
Thanks in advance...