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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / January 2007

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Emissions Testing (NOx)

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(o.0) - 01 Jan 2007 19:15 GMT
Hi all,

I own a 1985 Toyota Supra that refuses to pass the GA emissions
testing. On the first test my NOx was above the limit on both the 25/25
and the 50/15 test. After the first test I SeaFoam'd the engine in
every way possible and used the "Guaranteed to Pass" magical liquid.
Ten days later I took the second test and my "HC" was much higher on
25/25 and my NOx passed on 25/25. NOx still did not pass on 50/15.

1) Did the much higher RPM values probably significantly affect the
values of the test?
2) What is the best (even temporary) way to push my NOx into the
passing zone?

(Test results are below)

All help appreciated,
Alex

Test Results
Format: [[TEST #]] [[VARIABLE]] = [[25/25 TEST]] + [[50/15 TEST]]

Test #1: 12/19/06
Test #2: 12/29/06

[#1] HC-ppm = [39/157] + [40/162]
[#2] HC-ppm = [98/157] + [36/162]
[#1] CO-% = [0.32/1] + [0.35/0.91]
[#2] CO-% = [0.25/1] + [0.23/0.91]
[#1] NOx ppm = [1315/1121] + [1622/1227]
[#2] NOx ppm = [1117/1121] + [1381/1227]
[#1] RPM = [1909/1500-3000] + [1771/1500-3000]
[#2] RPM = [2902/1500-3000] + [2967/1500-3000]
[#1] CO+CO2% = [14.1/6.0 min.] + [14.0/6.0 min.]
[#2] CO+CO2% = [12.9/6.0 min.] + [13.2/6.0 min.]
clifto - 01 Jan 2007 19:34 GMT
> and my NOx passed on 25/25. NOx still did not pass on 50/15.

Um, did John Kerry test your car?

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Nazi: a person who is winning an argument with a liberal.

Shep - 01 Jan 2007 20:20 GMT
Proper ign timing and a functioning egr system are the number one issues
with high nox.
> Hi all,
>
[quoted text clipped - 31 lines]
> [#1] CO+CO2% = [14.1/6.0 min.] + [14.0/6.0 min.]
> [#2] CO+CO2% = [12.9/6.0 min.] + [13.2/6.0 min.]
rpbc - 02 Jan 2007 02:20 GMT
Make sure it has egr flow, if not, correct it.  If so, put a converter on
it.
 
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