My wideband is always displaying that I'm running pig rich... Cruising down the highway in 4th.. or 5th.. whatever speed.. infact any time I'm driving.. it's in the 12's on the wideband.. When I go into boost the wideband reads off the gauge rich.. which is a good thing but I can't figure out why when I'm just cruising down the highway with a high manifold vacuum that I'd be running so fricken rich..

Tonight I was comin down and I decided to shut the engine off and let the car coast for a few seconds.. I restarted it and saw that my AFR was much better.. now in the 14's while cruising along.. that lasted for about a minute then it went back to pig rich.. low 12's and high 11's.

Any suggestions? Even at idle it'll be rich.. typically in the 13's.. sometimes mid to high 12's even..

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When you saying "cruising" do you mean "coasting" (e.g. foot not on accellerator)? If not, once you use the accellerator, your vacuum decreases and you can actually reach positive manifold pressure just by driving normally at highway speeds (particularly with a small turbo). If so, you will come down from stoic afr.

*sigh*

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Cruising and coasting.. 2 different things. Cruising down the highway in 4th gear at about 3400rpm and 15% throttle input.

If I am touching the throttle it's rich.. The only time it isn't rich is when I let off the gas and coast in gear.. then it goes off-scale lean.. at idle it's rich.. while driving it's rich.

uhh.. is that your wideband in the manifold. ive never seen that done before either. i normally see EGT sensors there and the wideband Post turbine, in the DP. im not positive but id be willing to bet that the location of the sensor is what is giving you these readings, imo.

you o2 sensor isn't working. replace or fix the sensor and youll be in the 14afr range when you cruise.

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that could also be the problem. good point. aem even tells you in the manual to NEVER put the wideband in there on a turbo car. it should go in the downpipe, after the turbo.

This post has been edited by lagos: Nov 15, 2006 - 1:04 PM

http://www.wmsracing.com/o2/install.htm

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Word.

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from that pic, that looks like #3...thats normally where you'd run a EGT gauge....certainly does look like a wideband tho.