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#1
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Misfire ???
Hi There,
I'm trying to get the LPG install working and struggling. On LPG I get a missfire on Cylinder 8. I know LPG tends to show up faults in cars that petrol is less fussy with and that's what i'm thinking as it's fine on Petrol. I've changed all the coils and all the spark plugs. I've just swapped coil and pack from 8 (back left) to 5 (front left) with no change at all. However we've also tried running injector from 8 onto 7 & vica versa which is saying the car, but.....Well what else can cause misfires??? Vagcom codes : P0300 Random/multiple P0308 Cyl 8 Any ideas ??? Lee |
#2
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I had this on my B6 S4, cylinder 3 at the time, kept rotating coil packs, no solution - turned out to be the inlet flap - mrc sorted that and the lpg was fine, it was a BRC system
Last edited by 1781cc; 13th September 2016 at 06:42 PM. Reason: Spellcheck fail |
#3
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Hi There,
Interesting. I'm guessing that there is some form of inderviduality within the flap mechanism, which means it can effect just one cylinder. MRC ??? Thanks, Lee |
#4
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MRC are a company based in Banbury, well known for their Audi/VW tuning experience. If you are local they are worth dropping a line, if not, there are similar companies that may help and probably some local to you.
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#5
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Hi there,
Peterborough Here....So it's aprox hour and a half drive....Plausible Though I do like working on it myself! Lee |
#6
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If you clear codes and start from cold and switch to gas asap how long does it take before it flags the code , does it have the missfire counter in vcds .
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#7
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I'm having the same issue with my 2.7T - could you please help what do you meant by "inlet flap"?
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#8
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Quote:
The 4.2 petrol V8 is quite a complex beast and the onboard error stuff is actually pretty basic, so agree with steamship, you'd probably do better elsewhere as this place is great for A8/S8 stuff, but we've not got much experience on other things!
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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) |
#9
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what do you mean by inlet flap? i have the same problem
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#10
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He may be referring to the flaps in the intake manifold.
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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 Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
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