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Old 10-05-2015, 04:34 PM   #1
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So my 02 3.8 threw 2 codes on me today, system too lean bank 1 and system too lean bank 2. I've cut the exhaust off behind the Y so it still has the cats. I've already replaced the exhaust manifold.

2002 3.8l v6 automatic

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Old 10-06-2015, 07:13 AM   #2
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Did you disturb the 02sensors or their wiring when cutting? Just a thought!

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Old 10-06-2015, 09:49 PM   #3
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could be a list of things for a lean code. although i don't think it's your new exhaust unless you messed up an upper sensor when you changed the manifolds out. Can you give us details on how it's acting besides the codes?

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Old 10-12-2015, 09:46 PM   #4
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02 sensors, vacuum leak, air coming in after the MAF sensor

MAC long tube headers, pypes o/r H pipe, MAC catback, SR cold air intake, Performance Automatic shift kit, blacking out

Blacking it out, MAC duel exhaust, SR CAI, Performance Automatic shift kit. And a long build list wrecked in July '14
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Old 11-13-2015, 08:34 PM   #5
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I agree with 2000v6stang. 02 would be my first stop. Whens the last time you cleaned your MAF?

one day i hope to have something pretty damn witty here
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Old 11-17-2015, 01:03 AM   #6
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Check the ducting from air box to throttle body. If there is an air leak or crack anywhere or the map sensors or O2's r unplugged? Aside from that I'd check on replacing O2 sensors

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Old 11-17-2015, 06:31 PM   #7
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Whats the voltage coming from the o2 sensors

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