MustangWorks.com : Ford Forums - View Single Post - Ever fail emissions with a mac (cat) h-pipe?

SmokeyDP · 03-31-2001, 03:12 PM

Hope this helps. I had the same problem with a stock-H Pipe. NOx was double the allowed limit. I had everything tested cept for the CATs and decided not to get a new pipe, I retarded the timing from 15 to less than 6 degrees(not sure the exact, it was done by the shop). Then it passed. 92 GT 80K miles. They said they tested my EGR and it was fine, but now I am getting error codes saying EGR out of range.

Scott

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1992 GT 5.0L Convertible
BBK Shorties, Flowmasters, Super Chip, Mass Air, Under Drive Pullies, Hurst Shifter, Duck Tape
AIM: SmokeyDP

03-31-2001, 03:12 PM	#2
SmokeyDP Registered Member Join Date: Jun 1999 Location: Middlesex, NJ Posts: 212	Hope this helps. I had the same problem with a stock-H Pipe. NOx was double the allowed limit. I had everything tested cept for the CATs and decided not to get a new pipe, I retarded the timing from 15 to less than 6 degrees(not sure the exact, it was done by the shop). Then it passed. 92 GT 80K miles. They said they tested my EGR and it was fine, but now I am getting error codes saying EGR out of range. Scott ------------------ 1992 GT 5.0L Convertible BBK Shorties, Flowmasters, Super Chip, Mass Air, Under Drive Pullies, Hurst Shifter, Duck Tape AIM: SmokeyDP