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After headers o2 weirdness

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91RSVert
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Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

Posted: Sat Dec 29, 2007 3:56 pm Post subject: After headers o2 weirdness

Before I installed my headers, I had a crushed 2.25 y-pipe, manifolds, stock cat. I was getting left n right o2 readings within 1-2% of each other. So I got my headers installed, custom y-pipe, for now no cat converter(gotta order a 3" one). O2 sensors are in almost same exact location. They are completely different now. One side is adding 30 to 50%fuel. Other side is removing 12-15% When in open loop(cold) it runs GREAT. But when its in closed loop(warm) it runs like ass now What would have went wrong that I am getting this wack of o2 readings now?

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iansane
Member

Joined: 16 Jan 2004
Posts: 5742
Location: Bothell

1991 Pontiac Trans Am

Posted: Sat Dec 29, 2007 4:17 pm Post subject:

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Exhaust leak?
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Sometimes I actually think I'm slightly retarded in the mouth.

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91RSVert
Member

Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

Posted: Sat Dec 29, 2007 4:28 pm Post subject:

just crawled under and checked. No leaks at heads. Both mounts to y-pipe are not leaking. So if there leaking, its in the actual headers.

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91RSVert
Member

Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

Posted: Sun Dec 30, 2007 12:15 pm Post subject:

Figured it out. Still quite a bit of difference, but atleast both are doing the same thing now.

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Schultzy89GTA
M.R.A. (11sec Club)

Joined: 08 Jan 2004
Posts: 4417
Location: Gresham, OR

1989 Pontiac GTA

Posted: Sun Dec 30, 2007 12:23 pm Post subject:

What was it? -Schultzy

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91RSVert
Member

Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

Posted: Sun Dec 30, 2007 5:20 pm Post subject:

The wires to the 02 sensors got switched while they were disconnected. Bank 1 had bank 2 sensor Bank 2 ahd bank 1 sensor

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Twilightoptics
Hardcore (12sec Club)

Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

Posted: Sun Dec 30, 2007 5:22 pm Post subject:

LOL atleast you found it. What are you running that runs two O2?

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91RSVert
Member

Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

Posted: Mon Dec 31, 2007 8:25 am Post subject:

OBD2/Sequential fire on a TPI intake.

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Twilightoptics
Hardcore (12sec Club)

Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

Posted: Mon Dec 31, 2007 5:43 pm Post subject:

Nice

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blue89
Member

Joined: 23 May 2006
Posts: 3482
Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

Posted: Wed Jan 02, 2008 8:51 am Post subject:

Aha! Thats good you figured that out! What a wierd problem huh?

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