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03-06-2007, 10:04 PM | #1 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
Posts: 7,744
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AFR running extra rich at WOT?
I'm not sure if anyone here has an air-fuel ratio sensor on their car, but hopefully someone knowledgeable can help me with this.
Normally the ratio flicks between rich and lean, from what I understand this is normal, just the ECU's way of improving the catalyser's performance. But, I was on the highway the other day, in 5th gear, pedal to the metal, crawling along the traffic (), and I was checking my AFR gauge, which was stuck pretty high, at a little under 12:1. When this is the case there is also a slight sulphurous smell pervading the cabin. So, as my ECU has not been touched, is this rich ratio normal in these situations? From my understanding it should be running maybe a little lean in order to extract maximum power, right? Or could this be a result of a faulty/dirty MAF sensor, or just my AFR gauge being stupid?
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