On Sun, Jun 17, 2012 at 4:32 PM, John Meeks <vanagon@gmail.com> wrote: > Is the best way to verify this adjustment to find someone with a NOx > sniffer? >
Nah, you can just use a wideband oxygen sensor. NOx is a secondary effect of lean mixture, so you might as well measure mixture directly so you can tell if it's rich also. I got a cheap AFM off eBay years ago that had been horribly maladjusted and got it to work with my wideband O2 meter. I have the older version of the Innovate Motorsports LM-2: http://www.innovatemotorsports.com/products/lm2.php That, plus an O2 sensor socket to remove the stock lambda sensor and plug in the LM-2 wideband sensor, and finding the issue with an AFM isn't too hard. NOTE: you must run the engine warmed up, in open loop, and aim to bias a little towards rich rather than the stoichiometric 14.7:1 ratio. This was YEARS ago, but as I recall, the Bosch book says Digifant ECU defaults to the WOT table on open loop, which ought to read somewhere in the neighborhood of 13.5-14 air to fuel ratio. |
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