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1990 Nissan 300ZX. It did not pass smog check in HC, CO, and NO.

I went to do my smog check for my car and the results were Gross Polluter. I don't know what is wrong with the car. There is a little bit of oil under the car, but it's not enough for it to drip onto my driveway. There never is any black/white smoke coming out from the tail pipe and the engine temperature is always stable and where it should be. I also did the oil change before i took it in to do the smog check. I do have an after market exhaust, but it has a catalytic converter on it and a muffler.
Answer:

We can only recommend at this point you use our online smog check diagnosis system and have one of our smog technicians evaluate your Nissan 300ZX's smog check failure. We'll be able to give you a much better idea of what your vehicle's emission problem might be. The SmogSmart VIR Report system will ask you to fill in all the information our report system & technicians need to effectively evaluate your vehicle's emissions failure. You may also use the "Additional Information" section of the blank form to include detailed comments. To obtain your Nissan's online diagnosis visit the On-Line Evaluations Page at Online Smog Check Diagnosis posted by SmogTips Support

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