HOW-TO: Mechanical CEL Fix for a Header

[Tom]

Great, thank you sir.

[aTm Beaner]

Syz, I see that you left the lower exhaust manifold heat shield in place? How is it being held in place with the alternator?

[SYZ]

on the 2005, it bolts to the alternator. it might be different for other model years

[S0C0nFused]

Well, I just got some good news sort of. According to my state inspector. IF I have a header, and IF I have a cat following the header (directly after the flex), and IF the 02 sensors are mounted mounted in the proper location (so in this case, the 2nd o2 before the HF cat and the 3rd o2 behind the cat (note: I have the bolt in 'secondary' cat for my cat-back system and there is just enough room to weld bungs to the lead-in/out pipe flanges), And IF I have the stock tune and no CEL are present. I will pass.
That's a lot of IF's. So my questions are (assume a stock tune as they could not read TOM's tune for some reason).
1: Would I would still need to use the bung extenders as the 2nd and 3rd sensors are actually going to continue being used in the proper manner? (although with a high flow cat).
2: As the 2nd and 3rd sensors are quite a bit further downstream, is this going to create a problem? (A.K.A. Cel?)
3: Assuming number 1 is false. Is there going to be room for the extendors + the o2 sensors if there located in the tunnel?
Thanks!

[voortrek3]

Assumption is the mother of all f ups. Just be glad you don't live here in CA where CARB kills most of the fun mods.

[S0C0nFused]

Originally Posted by voortrek3

Just be glad you don't live here in CA where CARB kills most of the fun mods.

I am! at least once a week. Lately, more-so.

[SYZ]

Originally Posted by S0C0nFused

Well, I just got some good news sort of. According to my state inspector. IF I have a header, and IF I have a cat following the header (directly after the flex), and IF the 02 sensors are mounted mounted in the proper location (so in this case, the 2nd o2 before the HF cat and the 3rd o2 behind the cat (note: I have the bolt in 'secondary' cat for my cat-back system and there is just enough room to weld bungs to the lead-in/out pipe flanges), And IF I have the stock tune and no CEL are present. I will pass.
That's a lot of IF's. So my questions are (assume a stock tune as they could not read TOM's tune for some reason).
1: Would I would still need to use the bung extenders as the 2nd and 3rd sensors are actually going to continue being used in the proper manner? (although with a high flow cat).
2: As the 2nd and 3rd sensors are quite a bit further downstream, is this going to create a problem? (A.K.A. Cel?)
3: Assuming number 1 is false. Is there going to be room for the extendors + the o2 sensors if there located in the tunnel?
Thanks!

the 2nd o2 sensor actually is supposed to monitor the cat itself. the 3rd monitors after the cat. I'd leave the 2nd o2 in place w/ the anti-fouler, and then relocate only the 3rd o2 sensor behind the high-flow cat

[S0C0nFused]

Not sure what you mean by "leave the 2nd o2 in place" SYZ. I would use the OBX header. It has one o2 bung in the collector for the 1st o2 sensor. I would add 1 additional bung in the collector for an A/F meter. Could you expand your thought plz. Also, could you tell me about how long the 3rd o2 sensor with 2 anti-foulers is approx? I need to measure and mark locations.
Thanks!

[koke'sfocus]

this nonfouler thing didn't work for me :S any pics of a 2008 or any one with 2 sensors?

[SYZ]

Originally Posted by S0C0nFused

Not sure what you mean by "leave the 2nd o2 in place" SYZ. I would use the OBX header. It has one o2 bung in the collector for the 1st o2 sensor. I would add 1 additional bung in the collector for an A/F meter. Could you expand your thought plz. Also, could you tell me about how long the 3rd o2 sensor with 2 anti-foulers is approx? I need to measure and mark locations.
Thanks!

Okay, so you have 3 sensors, right? And you want to add a wideband sensor as well for a total of 4 sensors? If so, you need to add two more bungs in the header, one for the #2 o2 sensor (put a non-fouler on this) and then one for your wideband sensor. Then, way downstream after the catalytic converter, put a bung for that final #3 o2 sensor. I don't have the lengths, but two anti-foulers stacked on top of each other is about 1 inch long. You'll then need to add the length of the sensor.

Originally Posted by koke'sfocus

this nonfouler thing didn't work for me :S any pics of a 2008 or any one with 2 sensors?

do you have a PZEV car with the air injection rail in the exhaust manifold?