I AM A PRIVATE FIRE INVESTIGATOR THAT RECENTLY INVESTIGATED A FIRE IN 2001 VOLKSWAGEN PASSAT. THE FIRE WAS VERY MINOR ORIGINATING BELOW THE PLASTIC ENGINE COVER AT THE IGNITION COIL MODULES AND PLUG CONNECTOR BETWEEN CYLINDERS #3 & 4. APPEARS TO BE A HIGH RESISTANCE CONNECTION AT THE PLUG CONNECTOR CAUSING THE PLUG CONNECTOR TO OVERHEAT AND IGNITE. *JB