Quote:
Originally Posted by AndrewCologne
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.
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.
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Hard to figure out. Been through at least 4 O2 sensors, 3 O2 relays and I have a spare O2 ECU that reads exactly the same. Even changed the O2 sensor-to-ecu connector.
The AFR makes sense in open loop ie, WOT or before O2 kicks in. In closed loop too lean.
Another example. Using Gunson Gas Tester I set the CO to 1.5 on Wednesday. This should be a bit rich for my car. Plugged in the O2 sensor AFR went straight to 15.8
The ecu does not know what exhaust I have or where the O2 is plugged in or whether I have unplugged the ignition distributor retard hose. All it knows is once it receives O2 sensor input is to vary the FV to achieve 14.7 AFR. Mine is either doing that and the indicator is wrong, or the gauge is right and the ecu is seeking the wrong value.
I did send the gauge back to John Bell and he double checked the gauge was calibrated properly for my AEM controller.
I had a hard time getting the gauge wired up. It is a split voltmeter/AFR gauge (see pics above). It’s been a couple of years so I will go back and check my grounds and verify what wire goes where. But as I said, in open loop it looks to be working properly.
Lastly, I recently bought a used Lambda ECU wiring harness from another Pelican. It’s possible I could have a short or broken wire somewhere but I am grasping at straws there. It’s literally the only thing I have not changed.
Thanks for everyones input. Always appreciated.