I have a 95 civic with a d16z6 running the p28 ecu. I have been trying to get this car pass smog but no matter what i've changed it would not pass smog. It still running rich. I'm just wondering because the ecu looks like its been opened before, and my question is how can I tell if the ecu has been chipped? And will a chipped ecu cause my car not to pass smog and burn rich??