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Old 06-04-2008, 02:19 PM   #51
pitchblack_focus
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This is definately worth a try because the parts are so cheap. See if I can do this this weekend and will update.


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can you fit one AF on the last o2 sensor? If so, try drilling out the AF almost all the way, just enough to be able to screw the sensor all the way into it. You may not be able to do this, but it's worth a try. Make sure that the sensor doesn't come in contact with the AF in any way. Then, follow the how to on the second o2 sensor.
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Old 06-04-2008, 02:23 PM   #52
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You can always use a few washers as spacers between the o2 sensor and the AF in case it's close.
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Old 06-08-2008, 10:30 AM   #53
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this also works for just about any cars with headers... if it doesn't then yeah o2 bung needs to be relocated...

only problem is, i've seen one case where a guy kept getting a CEL cuz he moved it too far downstream..heh..
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Old 06-10-2008, 11:21 PM   #54
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i have a question on the part where it is UNDRILLED=>DRILLED=>o2 sensor. won't the computer think you have a bad sensor? how is the sensor supposed to read the exhaust gases if one of the foulers is undrilled? im sorry if this seems to be a dumb question.
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Old 06-11-2008, 12:52 AM   #55
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^^^ there's already a hole in the anti-fouler. You just aren't drilling it wider is all. The point of drilling the anti-fouler is so the sensor can fit inside it. Otherwise, the hole that's already there is too small a diameter for the sensor to screw into. That's all.

If for some reason the computer throws a code saying your last o2 sensor is bad, that means the undrilled hole is a little too restrictive and you should drill out both anti-foulers, allowing some more oxygen to the sensor. But I doubt it will, so that's why I said to leave the one undrilled.
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Old 06-11-2008, 12:54 AM   #56
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Quote:
Originally Posted by willybos View Post
Great thread man! This is going to help me so much. I was just talking about problems with the header on a PZEV, did you make this thread because of little 'ol me?

ha, yes, probably partly due to your and others' threads.
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Old 06-11-2008, 12:54 AM   #57
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de de de...i got you! thanks
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Old 06-11-2008, 02:07 PM   #58
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Added to the HOW TO ARCHIVE.....
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Old 10-08-2008, 10:23 AM   #59
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nice write up
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Old 10-08-2008, 02:20 PM   #60
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it works too! brad did it on his new header, and its going along nicely, no CEL.
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