Quote:
Originally Posted by AndrewCologne
IF the ECU is not at fault, then the cause of the surging is actually quite simple: regardless of the lambda control in your case the CIS system obviously does not provide a stable mixture or AFR under steady-load driving conditions. The AFR swing (its amplitude) is so large that the original ECU cannot compensate quickly or effectively enough, causing the mixture to become intermittently too lean — which results in surging. You can deactivate the regulation and drive as suggested earlier in this thread. However, that means you must enrich the base mixture in static open-loop mode so that the highest AFR peak does not exceed 14.7:1.
But as mentioned, this does not eliminate the root cause — the engine will still run incorrectly, since this would also mean that under certain operating conditions, the mixture becomes too rich. It may result in smooth driving (as you already reported), but with improper fueling and the associated drawbacks.
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It is quickly getting to the end of driving season here in Massachusetts, do you think its worth having the ECU send out for bench testing while the car sits over the winter? I am not 100% ready to give up on the Lambda system yet. Getting close though! haha