This 1986 camaro 5.0l fuel injection failed smog for ignition timing out of spec, high HC and elevated CO . checking timing at idle @ 35 btc spec @ 6 btc, 15mph HC 127, CO 0.7 NOX 128. At 25mph HC 118, C0 0.5 nox 213. when I disconnected the timing connector (... Login to read more.