I have a low mileage 96 Mustang GT 128k miles. I keep the oil checked although it does use oil between changes. Maybe a month or two ago, the engine light came on and I took it to an auto parts store and they said the code said catalytic converter. The guy said it could be the catalytic converter or something as simple as a rotten hose and to keep driving it might cause lower gas mileage. I kept driving it.
The car seemed to run just fine until....I drove it about 15 miles and stopped to eat. When I got back in the car and tried to start it, it made a loud noise so I let of on the starter. Now it doesn't turn over. I had it towed to the mechanic. Since I had been driving for over a month with the engine light on, I forgot to mention the engine light.
The mechanic said that the engine may be blown. He said when he tried to turn the engine over that it felt "spongy" He seemed unsure why the car wouldn't crank. I told him today about the engine light and he seemed to think that blocked converters might cause the problem. He said he would disconnect the exhaust today and see if that was preventing the engine from turning.
Sound plausible?