2005 A8 D3 4.2 (BFM) - Low MPG

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2005 A8 D3 4.2 (BFM) - Low MPG

D3 - Engine Bay Everything under the bonnet

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#21

18th October 2016, 10:02 PM

Mechcanico Lee Mechcanico Lee is offline

Senior Member

Join Date: Jul 2015

Location: St Helens Haydock

Posts: 434

Could you bring the secondary pump back in , leave it running then re check fuel trims , or recheck engine vac whilst keeping secondary pump running .

At idle when it's using very little fuel I cannot see a 5 psi drop in main system pressure affecting your vac so much , but you never know .

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