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Failed Emissions Test
The results shown below are for a 1992 Toyota Pickup, 2wd, 4 cyl, 22RE EFI.
Idle, 881 rpm: Measured HC 180 ppm Maximum HC 120 ppm
Measured CO 2.56 % Maximum CO 1.00%
2500 rpm: Measured HC 25 ppm Maximum HC 180 ppm
Measured CO .01% Maximum CO 1.00%
Thus far I have replaced the catalytic converter, the O2 sensor before the CAT, the O2 sensor after the CAT, the Cap and Rotor, the Spark Plug wires, Spark Plugs, Throttle Position Sensor, Fuel Filter, Oil and Oil Filter, Air Filter, PCV Valve, both intake manifold gaskets (not including throttle body gasket), Tested the operation of the fuel injectors (carbuerator shop).
The resistance between pins E2 and VS on the volume air flow meter is 185 ohms (should be 200-400 ohms). Resistance increases when flap is opened.
The timing is good.
The egr valve tested good.
I have checked the evaporative canister. Applied air to the tank pipe air exited the pipe at bottom of canister. Air barely escapes out of purge pipe. Applied air to the purge pipe, air barely escapes out of tank pipe.
The above results indicate a rich fuel mixture at idle which is where my problem lies.
Does anyone have a repair solution?
Thanks for the help