Quote:
Originally Posted by Groundhog
Other than that your original post shouted 'air leak' to me particularly if the engine light comes on on full chatter.
Half a turn on the mixture screw is one hell of a lot by the way.
I can't possibly see that a rolling road would be of any significant help but it's your call
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Agreed. Mostly. A rolling road session seems an extravagant effort, especially if the knowledge of how it's meant to work is missing.
Nothing in the discussion so far has suggested that the car isn't performing otherwise. What you are experiencing is some form of fault when the car is on load. Knock regulation? Loss of knock regulation? Failure of a sensor?
An air leak compensated for with a little extra fuel at idle will only adjust the mixture correctly in the low Rev, no load state. To be making frequent uncontrolled adjustments points to other issues.
It's time to start at the beginning, with a controlled approach.
Drive the car, read the codes.
What is reported? Do all of the sensors work? Likewise, the switches- idle and WOT.
Is it getting enough fuel?
Is it getting consistent, even fuel to all cylinders?