Hi Lee, thanks for the diagram.
I have blanked off the vacuum hoses to the combi-vales (red in diagram) and also blanked off the 15mm air hose (blue on diagram) to prevent any air reaching the exhaust if the combi-valves were stuck open.
I've just finished a 15 mile drive since making these changes and checked the results:
Engine Block 032 (Fuel Trims):
Bank 1 - Idle => 1.4%
Bank 1 - Partial => 15.4%
Bank 2 - Idle => 0.9%
Bank 2 - Partial => 10.2%
I reset the engine module and checked the short-term fuel trims again. The values at idle were:
Bank 1 => fluctuating between +18% and +24%
Bank 2 => fluctuating between +10% and +15%
As you can see, both banks are reading lean but bank 1 always seem to read slightly higher.
I also checked oil temperature as you mentioned a few posts back. A couple of minutes after the above 15 mile journey, the oil temperature was 89 degrees C. After a quick drive up the road it increased to 91. What was your theory regarding oil temperature?
Thanks
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