I did a smog on my 92 b250 it has 087659 miles and I passed on everything but on the N/O part 319ppm over the max is 707 it measured at 1026 and that's without a tune up or oil change or new filter so I came home and put new distributor cap and rotor New spark plugs and did a oil change will this help?and the oil was dirty to wear it smelled like gas a little and all spark plugs was gapped differently

 

replace air filter and find out why oil smells like gas

 

Where do you live that 92 requires smog testing?? California probably....Now that you have tuned it up, try again.

 

I passed smog today thanks everyone!!!!! :-)

 

Sure beats passing a kidney stone!