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#21
26th September 2023, 01:28 PM
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The problem persists! Sometimes it will stay clear for 600 miles or more, but the engine light eventually comes back on. IIRC, Mike suggested that the vacuum valves themselves might be blocked and that they can be flushed out with Fairy Liquid and water.
Can this be done in situ, because it looks like a right sod to remove them?
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!). 
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#22
3rd October 2023, 08:20 AM
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if you're getting a code for both banks, and all the vacuum pipework is good, its unlikely to be the valves. More likely the pump, which is in the airbox. That can seize up from moisture ingress but won't trigger a specific code. There might be an output test for it in VCDS so you could try that and see if you can hear the pump running.
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#23
5th October 2023, 08:57 AM
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I replaced the plastic pipes at the back of the engine with braided rubber and the warning light and error code (for both banks) disappeared immediately. But then a while later it was back. All the pipes that I can see look fine, but some of them seem to disappear into the depths of the under-bonnet wilderness!
I’ll have a look for an output test on VCDS. Thanks again.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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