Edited by UKAT1428 on June 18, 2014, 9:54 pm
I know you have had it confirmed by AD (I have only just seen your post) but for what its worth I can second the fact that the Frequency can decrease with air mass with some vehicles.
Mark
Modern cars, Its all wizardry and witchcraft
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Ford Fiesta 1.4D 2009 - AMM waveform? # - Mark Robins June 17, 2014, 4:58 pm
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on June 18, 2014, 9:53 pm, in reply to "