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| D3 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
11th April 2018, 01:41 PM
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ainarssems - It's a D3!
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell) 
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#2
11th April 2018, 03:42 PM
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Hi There,
Just had a play with VCDS. I ran the Readiness check (http://www.ross-tech.com/vcds/tour/readiness.php) Which checks various engine bits. The other day it passed all but the cats. Today it passed everything when going through, but the Evap showed fail too! This checks the secondary air (vac??) and a few other bits. It seems to think the lamda sensor aging is fine though? I cleared the engine faults so it clears the trims on block 032. I ran it for a while checking through all the engine blocks and then checked again and ran 2520rpm Block 01 - 2520rpm, temp 99c, Lamda1 -3.9%, Lamda2 2.3% Block 02 - 2520rpm, Load 15%, Inj Time 2.46ms, MAF 18.36% Block 032 -Idle (+) Partial (X) - B1 - Idle (+) Partial (X) - B2 1.3% -1.6% 0.4% -0.8% I then thought i'd give the LPG a go and see what that did Block 01 - 1120rpm, temp 102c, Lamda1 -18.8%, Lamda2 0% Block 02 - 1120rpm, Load 15%, Inj Time 2.87ms, MAF 7.68% Block 032 -Idle (+) Partial (X) - B1 - Idle (+) Partial (X) - B2 1.3% -18.8% 0.4% -0.8% Also got 16684 Random Misfire P0300 16692 - Cylinder 8 P0308Misfire 17718 - Cyl 10 Ignition circuit - P1310 short to ground 17536 - P1128 System too lean BTW - I got the 5/8 coils swapped by audi under warranty, I then swapped the last 3 so it had new coils. I've also tried two complete set of spark plugs. I took it to an LPG guy and he played and swapped LPG injectors - I do also have the Zenit LPG software and can do some things in there, however the conclusion of the process that it seemed to be the car shutting things down and I just never got it to the point it would do anything but the above style faults. IIRC the cylinder that shuts down varies too!
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell)
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#3
11th April 2018, 03:58 PM
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Has your LPG software ever been properly mapped to the car Lee? mine kept throwing up "too lean" faults until the LPG company had tweaked its software a couple of times and it gradually got better until it went and has never returned since - worth a look
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Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#4
11th April 2018, 04:16 PM
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Architex_mA8tey - I've got the software myself. Alas the company that did the install (~10 months before i got the car) are in Poland which makes thing interesting in terms of having a word or popping over!
It's a pretty good kit from what i've read and quite well specified. I've re-routed the odd pipe and cable which I was less happy with but never found anything that was a show stopper. The LPG guy I took it too also checked it over but wasn't a Zenit I've tried the adaptation routines and can get it to work, but the dropping cylinders makes it difficult etc
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell)
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#5
11th April 2018, 04:26 PM
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Quote:
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#6
11th April 2018, 07:18 PM
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Quote:
Woooo, I've pulled!!!.....Oh wait!
__________________
Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell)
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#7
11th April 2018, 09:01 PM
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Post the 4 gas readings from the mot gas tester report
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#8
12th April 2018, 09:28 PM
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The pre-cat O2 sensors on the BFM engine are 5-wire widebands if this is still relevant, I did mine last year. They were around £40 each (Bosch) shipped from USA, much cheaper than over here.
I think I had to remove the intake manifold. One side was fairly easy to swap but the other one was almost inaccessible. It took me a few days to finish the job in the end as I dropped my lambda socket somewhere behind the engine and couldn't find it. I think it's still in there now!
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- 2005 Audi A8 D3 4.2L Petrol - 2008 Ford Mondeo 2.5T - 2000 Ford Focus 1.6
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#9
13th April 2018, 02:37 PM
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Mechcanico Lee
Petrol - Fail ----- Fast idle Co 0.54% vs 0.3% HC 208ppm vol vs 200ppm L 1.056 vs 0.970 <> 1.030 2nd Fast idle Co 0.84% vs 0.3% HC 121ppm vol vs 200ppm L 1.015 vs 0.970 <> 1.030 Natural idle Co 0.53% vs 0.5% ----- LPG - Pass Co 0.55% vs 3.5% HC 804ppm vol vs 1200ppm MatthewH - Interesting. How and where ???
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell)
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#10
13th April 2018, 06:31 PM
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On the first fast idle the lamda reading fails ....but it’s failing only slightly and toward the lean side
On the second fast idle the lamda reading is a pass Don’t confuse the lamda gas reading with the lamda sensors .....it’s often done The lamda gas reading would be better off called mixture strength, lamda 1 or stoicimeteric 14.7 to 1 the ideal mixture strength . If a car passes on the lamda reading this means the mixture strength is correct so any co and hc failings are because the cats are not doing there conversion . Looks like the vcds readiness tests are bob on . I have heard of this thinners thing in the fuel and if it works so be it , it’s worth a go , don’t buy cheap after market cats , they are rubbish with nowhere near the precious metals and rhodium of genuines . If you are friendly with your Mot station often a good scragging up the road get the cats really hot then get it straight on the gas tester often gets the Co and hc down
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