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Discussion Starter · #1 ·
Well, me and my bud pulled out his scan tool and did some test's for live data.( i have been having idle/power surging problems 2 weeks after header install)

When cold, the 2nd o2 sensor on Bank 1 was not giving a voltage reading. Finally when it warmed up a bit to give a reading we got the idle problem.

It took about 2 minutes until we got the voltage reading/idle problem. The other o2's were already "warm" and giving voltage readings when cold.

Also, it was also doing a long term fuel trim of -6%

1 day later my CEL came on.

What is really odd is when I had my MAC catted H pipe on before this my CEL came on and I had the same code pulled. Bank 1, 2nd 02 is a problem (but then I had a buzzing in my exhaust - either a bad cat ot 02)

I would really love to fix this problem so I can install my blower and have peace of mind.
 

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It must be the fron 02 sensors. They can give idle probs. They may be broken or not plugged in properly. The rear 02's don't cause idle probs.
 
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