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Not so noob anymore
Joined
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130 Posts
Discussion Starter · #1 ·
Well, I passed another Drive Clean test yesterday. Although 1 test was "just" close enough.

ASM2525 TEST:
Limit Reading
HC ppm 82 64
CO% 0.46 0.28
NO ppm 633 632

Anyone give suggestions on what may be causing the high nitrous reading? Reading over the literature from the testing centre, it basically says everything in the car may be wrong if this reading is too high.

Thanks.
 

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5M-GE
Joined
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2,901 Posts
keep trying simple, cheap things first: try cleaning out your EGR valve, if at all possible.
 

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Druken Postwhore
AE92GTS
Joined
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2,490 Posts
its probably the inspector didn't warm up your car enuff....

seen 2 different inspecter test the same car, one failed since the car wasn't warm and one passed cuz he took his time....

anyhow, congrat!:thumbup:
 

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Mitsubishi Diamante Owner
'03 Diamante
Joined
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1,743 Posts
In TN, the HC limit is 220 or something like that and we don't test for NO here.

I don't know if warming the car up would change your number because you're passing the CO alright. Usually people say to warm your car up so the cat is operating correctly which will cause you to fail if not. I usually drove my car about 15 minutes before I went to the testing station.

Where I live now there is no emissions!! :cool:
 

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Not so noob anymore
Joined
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130 Posts
Discussion Starter · #5 ·
It's about a 10 minute drive to get there, then I had to wait 10 minutes for the clerk. I'm sure it didn't have a chance to warm up much.
 

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Mitsubishi Diamante Owner
'03 Diamante
Joined
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1,743 Posts
Was it running when you were waiting for the clerk? If so then there is no way it wasn't warmed up enough...
 

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Rotor > Piston
91 Camry, 90 RX7
Joined
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411 Posts
high NOx is caused by a few things. O2 sensor bad, EGR valve busted or not clean, catalytic converter (if you have a 3 way cat [91 and later]) basically when the combustion chamber temps are too high NOx is produced.
 
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