Originally posted by Luckie13:
It won't hurt his car just make it run real sluggish it should run fine so chances are he won't even notice.
I once drove to the store with a plug wire loose on a Mitsubishi, and melted the cat! I basically had to chisel off the top quarter inch of the ceramic in some areas, to unclog it. All that unburned fuel with create PLENTY of heat when it hits the catalyst.
