Cali Smog help

ONLY for ADVANCED technical discussion about the 240sx!
Posts: 3
Joined: Mon Aug 20, 2018 10:23 pm
Car: 1989 Nissan 240sx Coupe

Cali Smog help

Postby lehr98 » Mon Mar 25, 2019 7:13 pm

So I failed smog as a gross polluter, here are my results I have see foam I can use, ive changed spark plugs, wires, pcv, battery, belts since then.

Posts: 1185
Joined: Mon Jun 19, 2017 7:24 pm
Car: '11 Versa
'17 Altima

Re: Cali Smog help

Postby amc49 » Wed Mar 27, 2019 12:23 am

The EGR and front section of cat must both work well to lower NOx there.

You have done nothing to address what is likely an evap system leak somewhere. May be as easy as a new fuel cap but can be other things like leak in any vacuum or vapor line under the car going back to the fuel tank.

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