Please help pass CA smog test
#1
Please help pass CA smog test
Hi, everyone,
I'm new here, but was hoping you guys might give me some tips on getting a 1994 V6 4runner to pass the California smog test. It seems like it's pretty close to passing except for HC. The results are as follows:
@15mph/1831rpm
%CO2: 15.0
%02: 0.2
HC (PPM): 107; Max: 88
CO (%): 0.20; Max: 0.64
NO (PPM): 494; Max: 508
@25mph/1794rpm
%CO2: 15.1
%02: 0.1
HC (PPM): 78; Max: 53
CO (%): 0.15; Max: 0.77
NO (PPM): 354; Max: 761
Can anyone give me some tips on how to get the HC numbers to come down? Will changing the timing help? How about using premium fuel? Any help is appreciated.
I'm new here, but was hoping you guys might give me some tips on getting a 1994 V6 4runner to pass the California smog test. It seems like it's pretty close to passing except for HC. The results are as follows:
@15mph/1831rpm
%CO2: 15.0
%02: 0.2
HC (PPM): 107; Max: 88
CO (%): 0.20; Max: 0.64
NO (PPM): 494; Max: 508
@25mph/1794rpm
%CO2: 15.1
%02: 0.1
HC (PPM): 78; Max: 53
CO (%): 0.15; Max: 0.77
NO (PPM): 354; Max: 761
Can anyone give me some tips on how to get the HC numbers to come down? Will changing the timing help? How about using premium fuel? Any help is appreciated.
#2
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Join Date: Dec 2003
Location: Dallas, TX
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Ummm, slip the tester a Franklin?
Just kidding - Try here:
http://www.smogtips.com/six_things.html
http://www.smogtips.com/passing_inspection.html
There are tons of bottles of additives that you can toss in your gas tank that guarantee that you will pass the emissions test. How well they work, I honestly don't know - never tried any, but most offer a money-back guarantee.
Other things you might try -
Replace the spark plugs, and make sure they are gapped correctly.
Clean the throttle body.
~Bill
Just kidding - Try here:
http://www.smogtips.com/six_things.html
http://www.smogtips.com/passing_inspection.html
There are tons of bottles of additives that you can toss in your gas tank that guarantee that you will pass the emissions test. How well they work, I honestly don't know - never tried any, but most offer a money-back guarantee.
Other things you might try -
Replace the spark plugs, and make sure they are gapped correctly.
Clean the throttle body.
~Bill
#3
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Join Date: Sep 2003
Location: Albuquerque, NM
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The largest cause of high HC is due to a dirty air filter. If recently replaced, then run a can or two of berrymans injector cleaner through the tank, and as bill suggests, replace plugs, dist cap & rotor, and clean TB and MAF.
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