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Posted by Matt (93SE) on June 09, 2002 at 23:55:42:
In Reply to: Could the broken exhaust studs and warped manifolds common on the VG affect Emissions Testing to the point where it can affect readings? n/m posted by Will on June 09, 2002 at 11:44:15:
That's at least my guess on what happens, but I DO know that if you've got a bad enough air leak in front of the O2 sensor, it will cause problems with the air/fuel mix which will mess up your emissions.
causing the O2 sensor to read that there's oxygen in the exhaust stream, so it will richen the mixture.