Herow,

I have a 1991 300zx 2plus2 NA. Has anyone tried to put rubbing alcohol in their Z to help it pass smog?? I've been reading and it seems to work but its mainly american cars that people do it on. Any insight to do this trick in a japanese muscle car?

I failed smog about 1 month ago. The previous owner tired to delete the EGR and had the EGR tubes disconnected and i just put them back in without taking the plenum off mainly to pass the visual.

 

All you need the EGR for is visual, these motors run really clean.

 

Well I already failed the smog once though. These were the readings. Has anyone tired the alcohol in the gas tank??

15mph
HC(PPM) MAX 76 Actual 160

CO(%) MAX .50 Actual .96

NO(PPM) MAX 537 Actual 1138

 

I've never tried the alcohol technique. But, I would suggest you change your oil, install new pcv valves, and install new, proper ngk plugs if you haven't already.

 

How about taking a peek and the Engine Health..

Do a Compression Check, post the readings..
Do a Cylinder Balance test.. post the Readings.

It's posable you have leaking Valves or leaking Injectors.. and no 'Tricks' will fix that.. just maintenance..

Car seems a little dirty.. has to be a good reason for the bad smog test.. have you checked the Ignition Timing??.

Cap

 

Check your MAF and ECU coolant temp sensor, run ECU codes.