View Full Version : High AFR value
Ram Air IV
July 8th, 2012, 05:25 AM
I have observed that the AFR on my car has changed the last days. Earlier that the WB show a AFR of 13-15 under normal load. Now the AFR value is 17-18 (max). What could cause this? Clogged injectors or some other things. Unfortunately I don´t get any DTC and with such high AFR should I get a DTC for lean bank 1 or 2 or both? I Have attached a short logg file. Is there some one who know what I should look for.
Magnus
ps I have also observed that the fans runs more often. ds
andysc3
July 8th, 2012, 05:33 AM
Mine had a similar issue. Turned out to be an exhaust leak. Post up your tune.
Ram Air IV
July 8th, 2012, 05:54 AM
So here is the tune.
joecar
July 8th, 2012, 05:52 PM
+1 check for leak in exhaust header.
Ram Air IV
July 12th, 2012, 07:09 PM
With a bottle of STP injection cleaning and 200 km of driving it is back to normal AFR (14-15), Placebo effect ?
Tre-Cool
July 12th, 2012, 10:09 PM
or a loose spark plug lead. cyclinder not firing etc can still result in a lean idle.
joecar
July 13th, 2012, 01:41 AM
+1 correct, a misfire causes a lean condition (unburnt oxygen).
Ram Air IV
July 13th, 2012, 04:50 AM
Thanks all, I will have my eye on the WB lambda.
joecar
July 13th, 2012, 11:33 AM
With a bottle of STP injection cleaning and 200 km of driving it is back to normal AFR (14-15), Placebo effect ?This may have temporarily cleaned up something (injectors, valves, O2's).
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