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I have tried retarding and advancing the timing. Neither has any significant effect on HC or CO. I'm sure I'm dumping in too much fuel or the CO wouldn't be so high. I am not looking forward to replacing the ecu, but that might be my next step. I might try swapping fuel pressure regulators...

I put a new cat on. It appears to help as there was some visible smoke before the new cat and no smoke after, but the car still fails for high HC and CO, at about the same levels as before the new cat. Very frustrating. I don't suspect rings since compression is good and consistant in each...

While browsing other threads, I found this comment: "if your car is tuned to an afr that is close to 14.7:1 and you have a working cat, youll pass most emission tests." Forgive my ignorance, but how do you tune the afr? This ain't the old days when you turned a screw on the carb.

The engine (1.6 L VTEC) has lots of power, more than my '94 del Sol or '94 hatchback (both have 1.5 L engines) and gets 35+ mpg. If a new cat fixes the emission problem, is there a good reason to get the original ECU?? That would be a rewiring nightmare since the ECU plugs are different. My...

Thanks for your advice. I checked the cat temperature after the engine warmed up this morning. The cat appears to be at about the same temperature as the inlet temperature so I think it is not working well, if at all. I had already checked the injectors by pulling the wires off each and...

It's probably the original cat. The only reason I don't suspect the cat is because I have an '87 Civic with bad rings and 220,000 miles on it, but CO was well under 1% with the original cat. Will a new cat clean up CO at 6%, HC at 250??

I bought a 1988 Civic hatchback with a '95 del Sol VTEC engine in it. It's got the original ECU. It had several error codes that I tracked down because I thought they were causing the emission problems, but it is still failing emissions for high HC and CO. Compression is good, 180 psi in all...