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how to pass emission on obd1?

 
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Old 12-23-2010, 02:08 AM
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how to pass emission on obd1?

they did a 2500 rpm test and i failed,can i just get a catalyc converter, would i pass then?
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Old 12-23-2010, 12:17 PM
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Re: how to pass emission on obd1?

what were the numbers ? how bad did you fail ? if you have the numbers i could help you a little more . you would be amazed how far a new 02 and fresh plugs will go as far as emissions testing .
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Old 12-23-2010, 01:37 PM
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Re: how to pass emission on obd1?

Is your car OBDII originally?
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Old 12-23-2010, 04:48 PM
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Re: how to pass emission on obd1?

yes the car is obd2 but i have a obd1 p28 ecu and a converssion harness.my numbers were HC 243, CO% 6.39, co+co2 % 17.19. i have a extension adapter on my test pipe that moves the o2 sensor out of the test pipe so i dont think i can do anything with that.and the plugs are about a month old cuz i just put a rebuild motor in.
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Old 12-23-2010, 04:53 PM
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Re: how to pass emission on obd1?

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Originally Posted by Andrei View Post
yes the car is obd2 but i have a obd1 p28 ecu and a converssion harness.my numbers were HC 243, CO% 6.39, co+co2 % 17.19. i have a extension adapter on my test pipe that moves the o2 sensor out of the test pipe so i dont think i can do anything with that.and the plugs are about a month old cuz i just put a rebuild motor in.
the o2 you spaced out it the secondary that has nothing to do with the air fuels of the car . the primary o2 is the one in the header your car will actually set air fuels by the primary . by the numbers id say your gonna have to put a cat back on it to get it to pass .
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Old 12-23-2010, 05:54 PM
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Re: how to pass emission on obd1?

tahts what i thought.thanks
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Old 12-23-2010, 08:43 PM
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Re: how to pass emission on obd1?

A new cat is not going to change your HC and CO levels. Those numbers are showing that you have a slight rich misfire at that RPM. Unburnt fuel shows up as HC, or raw hydro-carbons. The CO is your mixture indicator, cause complete combustion will give you CO2 and incomplete combustion gives you CO. Low CO = lean, high CO= rich, you should be around .2 to .8 on the CO.

Check the condition of your spark plugs. I could give you more in depth look if I also have the idle numbers.
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Old 12-23-2010, 08:57 PM
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Re: how to pass emission on obd1?

HC idle limit 220, idle emissions 342, co% idle limit 1.2,idle emissions 5.09, co+co2% idle limit 6,idle emissions 15.49, o2% idle emissions 2.34, rpm 800.

so how would i pass emission test? i just found out that my stock ecu wont start the car is becuase of the emobillizer, and i have to spend $500+ to fix the emobillizer.
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Old 12-24-2010, 01:11 AM
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Re: how to pass emission on obd1?

do a full tune up and use premium
you didn't mention nox so im guessing it has nothing to do with your cat
change your front O2 sensor as well
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Old 12-24-2010, 01:18 AM
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Re: how to pass emission on obd1?

Be sure to get the cat hot before you go... Do a few VTEC runs right before you take it in. Doesn't guarantee a pass but it does help.
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Old 12-24-2010, 01:06 PM
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Re: how to pass emission on obd1?

would a dyno tune help?
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Old 12-24-2010, 05:18 PM
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Re: how to pass emission on obd1?

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Originally Posted by Andrei View Post
would a dyno tune help?
yes a good tune would help . if you can get him to pay special attention to the rpm and load range you could get him to make it a little leaner at those point at which they test your emissions .
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Old 12-25-2010, 07:22 PM
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Re: how to pass emission on obd1?

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Originally Posted by Si Speed View Post
Be sure to get the cat hot before you go... Do a few VTEC runs right before you take it in. Doesn't guarantee a pass but it does help.
Considering he said "test pipe" and has a homemade secondary O2 spacer, he's probably running no cat. To swap back to OBD2 and avoid the immobilizer, get a '96 P13 ECU
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Old 12-26-2010, 02:07 AM
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Re: how to pass emission on obd1?

i have a obd1 p28 that works, i dont need p13.i think emobilizer is the stupidest thing ever.
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Old 01-23-2011, 02:32 AM
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Re: how to pass emission on obd1?

yo! need some help people. I got a Automatic stock prelude with a 2.2l non vtec and it failed the emissions cause the car idled too high. the limit was 1000 rpm and i got 1450. i want to know what to do so i can pass and not a temporary thing. i really need help. hit me up please. its my girlfriends car. so dont get on my case bout havin a auto.
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Old 01-23-2011, 02:03 PM
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Re: how to pass emission on obd1?

go by what people said in this post.new spark plugs clean air filter , new 02 sensor.and i thought all preludes came with vtec even the auto ones.it would also help to crank ur vtec couple times before you go in for testing.
i finally passed, i did a dyno tune.
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