1976 datsun 280z. Not in Cali needs to pass an idle test.
Did this year 280 come with a cat? They wrote on my fail sheet no cat and no muffelor . But I was under the assumption I didn’t need a cat (will install muffelor )
Looks like I failed O2 by a little bit. drove the car 20-30 mins to inspection station. Filled with 93 octane. I know I have a bad air regulator( can change but am told that’s only for cold start). new spark plugs / old oil , old wires, old filters. I just need to get this thing to pass and then I will be doing a motor swap so I don’t want to sink in a lot of money. Can anyone help me out