This is topic 91 5.0 failed smog in forum Tech Talk at Northern California Ford Owners  .


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Posted by stoauto (Member # 2803) on :
 
what is "NO2" or something like that, it failed that part of the test at 15 mph. just need a quick answer. thanks.
 

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Posted by nitrous_bob (Member # 77) on :
 
co is carbon monoxide....
nox is (i think) noxious fumes

if the numbers were close .... you can get it to pass w/ lots of octane and a really hot car.
 

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Posted by Mario@APEX & Strictly-Motorsports (Member # 381) on :
 
NOX means that your cats are basically toast.
 

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Posted by stoauto (Member # 2803) on :
 
thanks alot guys, really appreciate it!
 

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Posted by jaybquick (Member # 4286) on :
 
Nox is Oxides of Nitrogen also referred to as photochemical smog. It is caused by high combustion chamber temps common to todays fuel injected cars. They invented EGR valves and Catalytic converters to fight it. Post all your readings even O2 and I will tell you your problem. Good Luck
 

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Posted by HungryHippo (Member # 537) on :
 
nox is mostlikely a faulty egr
 

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Posted by AcesWild85 (Member # 2616) on :
 
Won't a bottle of isopropyl alchohol in the tank help solve this?
 

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Posted by 90FoX (Member # 1974) on :
 
When I had to smog my 1990 5.0 lx I was running a Bassani high flow (only 2 high flow cats)x pipe.

What exhaust are you running?

I passed everything except NOX.I ran the codes from the computer and found out that my egr sensor was reading higher volts than it should be. So I used a voltmeter tested it out and it was higher than specs, I used the directions from a Chilton to test it. I replaced it and ran it through the smog again....didn't pass, still high on NOX levels. Then I just said fuck it put on my stock h-pipe and passed fine. What I'm trying to say is if your running an aftermarket exhaust system, maybe you just need to put on your stock h-pipe, because your cats on the aftermarket exhaust aren't doing their job well enough.

Good Luck
 

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Posted by stoauto (Member # 2803) on :
 
thanks for all the replies. the car has almost completely stock exhaust except for some perf. mufflers.
 

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Posted by jaybquick (Member # 4286) on :
 
my 347 passes no problem with a basani x and high flow cats. If all your systems are working right and the cats are good you will pass right no problem. Post all your readings.
 

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Posted by migs66/92 (Member # 4811) on :
 
hey guys im having the same problem with my 92
i have i replaced the cats, put new egr,exhaust system is pretty much stock with flowmaster mufflers ived taken it to the smog shop 3 times and its now considered a groos poluter does anyone know of a good shop in stockton that can find the problem and fix it right i have until 12-12-04 to do this
 

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Posted by Fostang (Member # 3752) on :
 

quote:

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Originally posted by migs66/92:
hey guys im having the same problem with my 92
i have i replaced the cats, put new egr,exhaust system is pretty much stock with flowmaster mufflers ived taken it to the smog shop 3 times and its now considered a groos poluter does anyone know of a good shop in stockton that can find the problem and fix it right i have until 12-12-04 to do this

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