MarineReconZ28

With a little searching and a trip to the hardware store, my 95 Z passed the smog check. So I figured I'd put up my numbers to show what it helped. So here they are. And heres what I did; I had maybe 3 gallons of 91 oct gas in the tank and added a quart sized can of the stuff into the gas tank and did the same "warm-up" with the car both days. I drove around for about 15-20 minutes, getting on it pretty good here and there, and the I left the car running while I waited for them to put it on the machine.
I tried to change as few variables from the day before so I knew if this stuff actually helped at all. ANd as you can see it help just enough on the one nnumber I needed it to change.

Top number is before the "pollution fix". bottom is after.
Anything with a "/" is my reading/max allowed

15 mph.............25 mph
CO2
%14.30............-14.40
%14.60.............-14.60

O2
%.57.................-.50
%.50.................-.50

HC
83/83.................58/48
65/83.................48/48

CO
%.29/.48.............-.22/.46
%.27/.48.............-.22/.46

NO
420/689...............335/706
404/689...............335/706

black95z0122

your giving me hope i'm going to try the same thing tomarrow. i failed it twice this week and am gaoing to try tomarrow for the last time before i break down and spend some of my cam swap money for a new cat.

why didn't u pass in the first place....cam/heads ?

blackztpi

must suck to live in a place that checks emmisions? haha indiana rocks!!! (knock on wood)

MarineReconZ28

No, the car is pretty close to stock from what I know. The guy who had it before me said he thought something might have been done to it, because he would beat C5 vettes and LS1 Camaros at the 1/8 mile track, but I don't know about that. I think it's close to stock. I think the cats are just hurting. It ran super rich for a while with a ex. manifold leak and it still has a pretty bad gas smell from the pipes.

Good luck.