Misfires during warm up, after warm up the engine runs smooth with high RPM of 1200 to 1300. I have to tap the accelerator pad to lower the RPM, after couple of seconds the RPM goes back up. When it reaches 190 degrees RPM goes higher to almost 1500, temperature goes to 210 degrees fan turns on from the radiator on the driver side but not on the passenger side, fan on the engine compartment sometimes turns on and sometimes not. Then the engine stops running at 210 degrees, start up but won't run. You have to wait for the temperature to drop down to 160 degrees, sometimes all the way down. Start it up then the engine runs.

- Kissimmee, FL, USA

This low-mileage vehicle experienced a catastrophic engine failure at freeway speed. The vehicle was cruising on level freeway when the engine lost power and white smoke began pouring out of the exhaust. The engine died and would not restart on the side of the freeway and was towed to a service facility. After complete disassembly it was determined that the engine was not rebuild-able due to a slipped cylinder sleeve which resulted in piston, cylinder head and block damage. Detailed photos are available.

- Westminster, CA, USA

The contact owns a 1999 Porsche Boxster. The contact had massive engine failure while driving 20 mph and the crank shaft broke. The vehicle was towed to a mechanic and the engine was replaced. The manufacturer advised the contact that the warranty was not valid and that there were no recalls for the failure. Routine maintenance was performed on the vehicle prior to the failure. The failure mileage was 42,000.

- Miami, FL, USA

Diagnosed problem was a slipped cylinder sleeve. Heat exchange between alloy block and steel sleeve has been prevalent in far to many of these cars. Check out www.986board.com and see for yourself.

- San Francisco, CA, USA