I stuffed a rag and an air line up the tail pipe and pressurized to 10psi, I sprayed soapy water on all the joints...I had a circumferential crack on the pre cat to collector weld. Probably because I neglected to replace the top motor mount. Not sure if this was the root cause. Only other oddities are a chattering evaporator purge valve, but no evap codes. The chattering sounds like a valve tap, and theoreticall could be a vacuum leak if the gas cap is bad. I've read some gas cap codes were deleted by dealers since they were a nuisance.:mad2:
