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Originally Posted by Funracer
It’s an AEM wideband controller. Used by many others here over many years in conjunction with SSI exhaust. What’s a bit different about mine is the JBell gauge, but he has made dozens of them for many here that use the same controller.
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Do all These users drive that controller in combination with that gauge in a lambda controlled k-jet car? As said, its all about the voltage wich equals Lambda 1, if the controller delivers a voltage where the gauge expects a different one for AFR 14,7:1 then ... the reading won't be correct, ... but I just assume, ... as ...the orig ECU with original exhaust system should let result a reading of lambda 1 at idle and normal driving. If not, then oxygen fluctuations in the exhaust flow could make readings get messed up, or the position of the sensor does affect its resulting voltage.
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Are you saying 15.8 could be normal idle reading with SSI’s?
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No, ... in my case with SSIs at idle the duty cycle rises more to match lambda 1, means the sensor reads to lean. In your case it's the opposite, ... the final lambda 1 reading is a bit too lean.
So, ... check the sensor, but it's a new one, as you said, and here ... is that new one even faulty as well? IN times of today sometimes with new spare parts you get even more into more trouble.
Or, ... the ECU could be faulty, targeting a wrong value.