pezzler Posted November 10, 2011 Share Posted November 10, 2011 I've had an AFR guage fitted to my car for about 10 months; the gauge has always given me a consistant reading, and it has always cycled between 14.6-15.2 on idle All of a sudden, out of the blue, the car has started to run lean. I seem to be getting around 12.8 from a cold start, but once the coolant gets a little heat in it and the IACV closes a bit, i'm getting 17.0 upwards. I checked the fault codes last week and it threw up a code 14; open or short in AIT circuit. Would a faulty AIT sensor tweak the fuelling to that extent? I was thinking that the it seemed more likely to be a coolant temperature sensor fault, can anyone shed any light on this? Anyone had anything similar? Cheers Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 11, 2011 Share Posted November 11, 2011 For most sensor problem's the ECU generally runs things on the rich side for safety, i presume you mean IAT sensor? and no if this or the coolant temp sensor was duff it would be showing rich AFRs, i would be inclined to be checking the wide-band sensor or its calibration. Quote Link to comment Share on other sites More sharing options...
pezzler Posted November 11, 2011 Author Share Posted November 11, 2011 I had an inkling that it should run rich when a sensor fails, but i'll take that as confirmation As for the wideband; in the early hours of this morning I read a thread started by Steve, who had a similar problem that eventually turned out to be wideband. Not sure on the best way to test it, but i'll have a trawl about for some more info. Bit pis*ed that it may be that the wideband sensor has failed already, I could have forgiven a 17 year old OEM one Thanks for your input Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 11, 2011 Share Posted November 11, 2011 They can be a little fragile under certain conditions, what make of WB is it. AEM or Innovate? Quote Link to comment Share on other sites More sharing options...
pezzler Posted November 12, 2011 Author Share Posted November 12, 2011 Its an AEM. Really havent done a great deal of miles on it, kind of expected more from a recognised branded bit of kit On the plus side, I guess the sensor is only about £60 ish so mustnt grumble Quote Link to comment Share on other sites More sharing options...
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