Engine has 97K miles, but car starts & performs as new. Does not burn oil; fuel economy excellent.
Yesterday's smog test: HC at idle was 403, much higher than the acceptable 100. Also at idle the readings were CO = 0.18, CO2 = 13.4, and O2 = 2.5. All acceptable. Readings were at 850 rpm, but the high HC is my concern. As soon as rpm was raised to 2,500, all readings were nominal & a "PASS" was issued..Following the procedures outlined in the Daihatsu manual, I tested the EGR, EGR VSR, modulator, O2 sensor & charcoal canister. All tested ok. New ignition wires, plugs, air filter. Valves & timing at spec. All carbon & deposits were manually cleaned from plenum, throttle body & surge tank. No vacuum leaks. Did not test other sensors or service fuel injectors. New rear cat installed yesterday prior to test. Original pre-cat at ex. manifold not tested. Please help & advise. Thank you.
I can crash that 5/7/2012The pre cat is know for melting down. I just removed one from my 88 becasue of it and it braught some power back. The honycomb inside melts down and the converter becomes weaker thus needing a new cat. I put an inline one in becasue it was less exspencive.