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| D2 - Engine Bay Everything under the bonnet |
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#1
15th October 2013, 04:49 PM
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FL S8: Airfilter box gone Boombox
Hi all.
Just spent an hour listening to the engine while idling  I've always since i bought the car 2 yrs ago felt like there was a strange repeatedly *thump* when listening closely to the engine while bonnet is open. While doing a check for intake leaks regarding the 17549 code by emptying a bottle of Start Gas on all places where it would be possible to suck some in.( no chance there is any leak..) i noticed after removing the cold air intake pipe that the boombox *thump* comes from inside the airfilter box.. Anyone else experienced this? From the good old days i would call this backfire caused by the timingbelt not in the right position but since car runs perfect it has to be something else. only issue is "auto-reving 3 times to apx 1800 rpm at coldstart before setling down. This started with the 17549 code appearing. So, any good ideas gents? 
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2003 Daytona Grey RS6 2000 Silver S8 2005 A6 1.8TQ Premium 1993 Audi S4 2.2 TQ MTM 330 (my first love!) 
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#2
15th October 2013, 06:11 PM
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Hi mine does this as well I just put it down to the air pump in the air box and didn't bother to investigate any further.
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 2002 S8 silver with black half leather 2000 d2 S8 in Racing green pearl, RS4 manual gearbox, 2003 A4 avant TDi 1997 Volvo V40 2.0T 1992 Mazda eunos v spec 1976 Reliant Kitten 1965 Porsche 911
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#3
15th October 2013, 06:24 PM
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Quote:
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#4
15th October 2013, 07:35 PM
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Its my pet hate
That pump is purely there to feed fresh air into the exaust just before the headers. It does this for a short time (few minutes?) on a cold start to ignite unburned fuel in the exaust and heat up the cats quicker, so that the D2 FL can achieve a Euro III emissions standard. I hate complications added just to satisfy emissions. of course this is not nearly as bad as gas recirculation on other cars (mostly diesels), which feeds the hot, dirty exaust gasses back into the intake manifold. what a terrible idea! Last edited by Goran; 15th October 2013 at 07:38 PM.
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