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#1
21st December 2022, 09:35 AM
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Engine stall……
Morning everyone,
Came up to Scotland for a quick pre Christmas trip and car seemed to get here relatively problem free….. Had one glitch at Lancaster services when I was entering services and the engine stalled when I was super slow into car park behind another vehicle… Anyway after that stop it was fault free and I was amazed at how little fuel it seemed to be sipping (approx 300miles half a tank) So this morning car didn’t seem to be idling too great and every so often even while driving along it just doesn’t feel right with idle dropping a little and a few moments when stopping at junction where it wanted to stall again. Any ideas what this could be. I’m a bit loathe to be driving the car now until I can have someone look at it and especially so before I try attempt drive home (circa 400 miles)
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2014 D4, FL 3.0tdi, phantom black, sport exec lwb 2002 D2 S8, Aqua Blue Pearl, original bar FE alloys and miltek 1997 D2 PF 4.2q, silver, Sport on roughly 90k and counting…. 1990 2.3 20v 7a Coupe Quattro **SOLD** 1996 2.6 v6 cabriolet, Isis red metallic **DEAD  ** 2009 D3, 3.0tdi sport, blackHad a few Audis over the years, mostly early stuff, newest was a D3 prior to my D4, nothing much kept me smitten with other marques so I floated about a bit from one thing to another until that four ring lure caught hold 
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#2
21st December 2022, 09:37 AM
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Meant to add - no dash warnings other than the battery light as it tries to stall, and I’ve no vcds to plug in and try.
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2014 D4, FL 3.0tdi, phantom black, sport exec lwb 2002 D2 S8, Aqua Blue Pearl, original bar FE alloys and miltek 1997 D2 PF 4.2q, silver, Sport on roughly 90k and counting…. 1990 2.3 20v 7a Coupe Quattro **SOLD** 1996 2.6 v6 cabriolet, Isis red metallic **DEAD ** 2009 D3, 3.0tdi sport, blackHad a few Audis over the years, mostly early stuff, newest was a D3 prior to my D4, nothing much kept me smitten with other marques so I floated about a bit from one thing to another until that four ring lure caught hold
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#3
21st December 2022, 09:48 AM
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Sounds like a vacuum leak. The usual candidates on a 32V are either the crankcase breather hoses which perish and collapse, or part of the brake vacuum assembly on the left side of the throttle body - item 24 in the pic tends to split where it joins the throttle body.
The breather hoses can be replaced by standard oil-resistant hose, which doesn't look great but is functional. #24 can be temporarily repaired using self-amalgamating tape. I'm contemplating a small production run of these next year as I need a couple myself. The other usual candidate for poor running is the coil amplifiers which live under the trim panel behind the air filter box. Scan it with VCDS and see if it has any misfire codes.
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#4
21st December 2022, 09:59 AM
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Do you have the air-con ECON button on? If so, try switching it off and see if that has any effect at slow speeds or at junctions.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold!  2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II HeadlightsMy DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
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#5
21st December 2022, 10:52 AM
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Thanks for the quick replies - no exon button on for the air con.
I was mid drive to Edinburgh /60mile trip when I was noticing it so I kept committed and have done the run and it seems to have sorted itself out again…… Going to try get it into a local mechanic tomorrow/Friday and see what they can suss out. @mikkiejayne would your suggestions be a sudden thing as this was very very sudden as had been driving perfectly sweetly up to now….
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2014 D4, FL 3.0tdi, phantom black, sport exec lwb 2002 D2 S8, Aqua Blue Pearl, original bar FE alloys and miltek 1997 D2 PF 4.2q, silver, Sport on roughly 90k and counting…. 1990 2.3 20v 7a Coupe Quattro **SOLD** 1996 2.6 v6 cabriolet, Isis red metallic **DEAD ** 2009 D3, 3.0tdi sport, blackHad a few Audis over the years, mostly early stuff, newest was a D3 prior to my D4, nothing much kept me smitten with other marques so I floated about a bit from one thing to another until that four ring lure caught hold
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#6
21st December 2022, 09:22 PM
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So just a quick update on this, after a few hours break in Edinburgh at a large Swedish store, the car drove home to my parents impeccably with a number of stops enroute for additional shopping and dinner, and with no fuss whatsoever!!
Question is then can something like what’s been suggested be totally intermittent and random in its presenting
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2014 D4, FL 3.0tdi, phantom black, sport exec lwb 2002 D2 S8, Aqua Blue Pearl, original bar FE alloys and miltek 1997 D2 PF 4.2q, silver, Sport on roughly 90k and counting…. 1990 2.3 20v 7a Coupe Quattro **SOLD** 1996 2.6 v6 cabriolet, Isis red metallic **DEAD ** 2009 D3, 3.0tdi sport, blackHad a few Audis over the years, mostly early stuff, newest was a D3 prior to my D4, nothing much kept me smitten with other marques so I floated about a bit from one thing to another until that four ring lure caught hold
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#7
22nd December 2022, 08:42 AM
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Very odd. Breather hoses and coil amps tend to be working or broken rather than intermittent. It suggests the cause may be electrical instead - wiring, maybe the throttle body.
Do you have VCDS yet? It might have recorded something in the ECU.
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#8
22nd December 2022, 12:55 PM
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Where abouts in the Midlands are you? I have VCDS and would be happy to run a scan if you happen to be in this area.
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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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#9
22nd December 2022, 05:06 PM
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Quote:
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2019 BMW M5 (my daily driver) 2002 Mark's D2 S8 FE 2020 BMW M340d xDrive (Anely's daily driver) 2000 FL D2 4.2 QS - SOLD 2011 
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#10
23rd December 2022, 05:45 AM
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Quote:
__________________
2014 D4, FL 3.0tdi, phantom black, sport exec lwb 2002 D2 S8, Aqua Blue Pearl, original bar FE alloys and miltek 1997 D2 PF 4.2q, silver, Sport on roughly 90k and counting…. 1990 2.3 20v 7a Coupe Quattro **SOLD** 1996 2.6 v6 cabriolet, Isis red metallic **DEAD ** 2009 D3, 3.0tdi sport, blackHad a few Audis over the years, mostly early stuff, newest was a D3 prior to my D4, nothing much kept me smitten with other marques so I floated about a bit from one thing to another until that four ring lure caught hold
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