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Discussion Starter · #1 ·
Ok I have been having issues with my Focus, the only thing I can really pin-point is my wideband numbers. On cold start my car is running between 10-12, once if warms up it usually goes back to it's 14 area it should be in, but it will go so low it will just sit at 10 for a bit probably because that's as low as the gauge goes? I just don't know what to start testing???

2003 Focus ZX3 w/SVT shortblock, PWSC with 2.6" pulley...
 

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Token Engin-nerd
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something might be wrong with your cold start fueling in the tune
 

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The Godfather
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As far as I am concerned, a little rich on cold start won't hurt anything. Does it go above 10 if you drive it cold or just sit at 10 at idle and wil driving?
 

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Discussion Starter · #4 ·
I belive it goes up when I start to drive it, sometimes it will stay at 10. Another thing is my idle bounces quite a bit on cold start, maybe it's my TPS??? Definitely could be tune, or the lack there of. I haven't tuned it since I got the BBK
 

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Token Engin-nerd
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no... definitely not.... its air/fuel, so a higher number means more air.

You might be thinking of short term trims which, on the focus, are the opposite of lambda, as in, <1 is lean and >1 is rich.
 

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Foci run rich at start up, its built in the tune to warm up the cat faster.
 
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