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05-14-2002, 07:00 PM
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Registered Member
Join Date: Feb 1999
Location: Baltimore, MD USA
Posts: 105
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Failed Emissions Inspection- Please Help
OK, I have a 1991 GT with a bone stock motor with the timing advanced to 14*. My MAC H-Pipe is about 5 years old and came with Hi-Flow Cats. I just replaced the O2 Sensors, cleaned the air filter, and I did a complete tune-up about three months ago.
I failed the Maryland emissions inspection in the areas of Hydrocarbons (HC) and Nitrogen Oxides (NOx) by a very small margin. The guy at the inspection station told me that it could be due to a number of things... running too rich or too lean... a faulty EGR valve... bad timing... a bad catalytic converter...???? The car seems to run fine... no check engine lights... and plenty of power on tap. Any ideas of what to try first? I only get one free re-inspection and want to nail it on the first try without having to pay somebody to diagnose the problem. Thanks in advance. John
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1991 GT Vert- Black/Black/Black Exhaust, Tremec, Tri-Ax, Centerforce Dual Friction, 3.73's, Rear Seat Delete MM Road & Track Kit PBR 5-Lug Brakes Cobra R's w/ 255 Rubber Rice Hater's Club #60 |
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