94 G STANG

ok first of all check if your egr is actaully getting vaccume, if you pull out your spout connector it will pass but it is illegal" it retards the timing" and the technician has no obligation to tell you whats wrong and what to fix, thats why i get paid to do diagnostics. Apply vaccume to your egr valve assuming you have a vaccume pump. the car should run like crap stumble and die. If it does not and runs the same it means you have blockage, if it turns off egr passages are open. Changing the cats will help but most probably you have an egr problem check it first let me know.
There is no such think as magic in the bottle !" except for nos"

Derf00

Well, since no one else mentioned it, I will, O2 sensors will also cause this. As O2 sensors get older they lag in response time. If the they are lagging, it would cause a rich condition to show up in which you would get too much fuel sent through the combustions chamber, overwhelming the cats. Over time this will burn the cats out prematurely as you get more and more carbon built up in them.

If you're tailpipes are very sooty, replace the 02 sensors after checking for vacuum leaks.

94 G STANG

02 sensors will not help in this case as you can see the co levels are ok.

McNasty11jm

well it really helped me

94 G STANG

did your car fail prior to using that additive??

JZTRK

yes and im on my way out to see if this realy works
its a fuel system treatment that cleans ill post the new smog sheet later

Derf00

Yeah, okay, I looked at some of my reference material and you're right... [sm=gobble.gif]

EGR system, timing too far advanced, excessive temps or worst would be running lean/rich but that's doubtful since everything else is fine.

94 G STANG

bump your timing back a bit and fill up with high octane 91 it will reduce your nox, i believe max allowable retard is + or minus 3 degrees and cross your fingers, make sure you have adequate coolant and your fan works.

JZTRK

HELL YEAH MAGIC IN BOTTLE G2P WORKS LIKE A CHARM
Took it to get it retested and it passed with flying colorsill post the new sheet in a few mins

McNasty11jm

yea failed then wenand put in G2P, changed me oil, put better gas in the car, and ran most of the gas out...then a wk later i passed all emissions and G2P really helped