1990 Chevrolet Corvette Q&A

1990 Chevrolet Corvette Question: car is a gross polluter

failed at co and hydrocarbon, have no known codes on the computer -
Answer 1
you need to have the engine checked out. plugs, wires, cap,rotor, air filter, o2 sensor, map sensor, cat and compression test. all these things need to be checked for a fialure. Roy -
Comment 1
have installed new plug wires, distribitor cap, rotor, checked the plugs ,seemed ok.. the cat conv. were tested (pass)at smog station. -
Comment 2
o3 sensor switching fast enough?? what are the cross counts?? how did they test the cat operation?? Roy -