1995 Nissan Sentra failed smog check for high HC. What could be the problem?

HC for both 15 and 25 mph were at the limit (92 and 57 respectively) failed smog bec. timing was at 0 tdc. retested adjusting timing to 8 btdc. fail HC by 2 on the 25 mph. 15 mph was at the limit. spark plug,wires,rotor replaced. what could be the problem? would adjusting timing help? how much adjustment is acceptable for DMV? thank you.


Answer:		Timing may very well be the problem however you really should have it set where the manafacturer recommends it. The state will allow you 3 degrees +/-. Any more than that and your Sentra will fail the funtional timing portion of the inspection. Other problems to look for would be compression, defective catalytic converter, and perhaps incorrect air/fuel mixture due to worn oxygen sensor. posted by SmogTips Support

Related questions and answers you might find useful:

1997 GMC SAVANA VAN lowest cost station. by Mary

1997 GMC SAVANA VAN by Mary

How do I pass the emissions test being that my car had work done last week and it's not registering by Quinndellia

Because my car had memory loss due to a battery being a change of what do I need to do to pass the vehicle test by Quinndellia

I store USDT in my wallet on OKX and have my seed phrase (clean party soccer advance audit clean evil finish tonight involve whip action). What is the process to send my USDT to Binance? by Skye