Quote:
Originally Posted by andrewwynn
From the diagram I see a possible issue: there is a calibration orifice. If that got plugged the system will think any actual leak is much bigger.
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True that! However, in my case the system is not detecting any leak, but it is saying it doesn't see the change in mixture that it's expecting when the canister purge is called for. The M54 has separate codes for EVAP leak, purge valve inop (grounded), and incorrect purge flow. I'm only experiencing a code for the latter.