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Old 05-27-2013, 08:53 PM   #1
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After intake install: lean, o2 #2 circuit.

I've read intake install problem threads with the 3" Maf housing causing a lean condition, but now it throws an o2 circuit code? Could the cat be coming apart after 172k? I'm working on the lean condition... codes thrown are p0171, p0136, and p1131 which says " lack of H02S11 SWITCHES, sensor indicates lean.


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Old 05-27-2013, 09:44 PM   #2
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Is it the same MAF sensor that was in the old housing, or did you swap MAF too?
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Old 05-27-2013, 10:12 PM   #3
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stock maf sensor, all the zetec motors to 04 use the same sensor, including svt's
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Old 05-27-2013, 10:20 PM   #4
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With the bigger housing, I wasnt sure if you upgraded to a larger MAF. Have you tried resetting the computer?
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Old 05-27-2013, 10:25 PM   #5
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What are you asking?

If you're using a 3" housing with a stock sensor - yes, it will throw lean codes.
And there is no reason you need that large of housing on a stock car. Hell, you don't need that big until you near the 300whp range.
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Old 05-27-2013, 10:31 PM   #6
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To my understanding, the sensors look the same, but the internals of the sensor, or the computer is different, not allowing a SVT MAF to be used on a Zetec without a tune.
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Old 05-27-2013, 11:30 PM   #7
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as far as my parts catalogs at work go, the sensors are the same part numbers. whether it's the running slightly lean, or the bigger housing, the car is stronger throughout the powerband WITH the bigger housing. I have no detonation, so how lean is too lean? My question is mainly for the other 2 codes, I had the lean code when experimenting with my intake before, but this is the first time for the o2 sensor codes.
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Old 05-28-2013, 05:41 AM   #8
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Moved to "General Technical Chat".
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Old 05-28-2013, 09:57 AM   #9
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Quote:
Originally Posted by zetecDon View Post
Moved to "General Technical Chat".

Why? This issue is directly related to an aftermarket modification, as well as discussing the performance of the zetec engine under said conditions.
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Old 05-28-2013, 11:29 AM   #10
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With the Title & the multiple issues, I'm betting Don thought you'd get some additional "looks" over here (General Tech.), from others who may have ideas who wouldn't see it in the "ZETEC Performance" area.

I'll toss it right back over there for you, since that's where you'd like it to stay.

Cheers!

P.S. - "Too Lean" can't be determined without a wideband 02 sensor installed to track/log the actual results. A "plug check" might give you an idea, but that's likely to just tell you what the computer is already complaining about. IMHO if you're not "tuning' it with a wideband and some help tuning the computer, you're playing with fire running lean. The "Butt Dyno" will show great improvement in many cases from a lean condition, right up to the time you hole a piston from burning too hot! I've heard many times in the past from Snowmobile customers that "it was running GREAT until it suddenly quit" in similar circumstances (those have to be tuned to air temp, and when a tune for moderate temps gets run in 0 degree temps they'll "burn down" by holing a piston). If you see "white" on a plug ground electrode when you check them it's a danger sign, and you'd want to look at the piston & return it to stock until you plan the experiment a bit more. Good Luck & tune carefully!
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Last edited by sailor; 05-28-2013 at 11:50 AM. Reason: Add
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