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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 293

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

ill give that a shot if this doesnt pan out. but now its been 3 items, o2 sensors, maf or could of been weak plugs. and my plugs had some serious color to them. for anyone interested

https://photos.app.goo.gl/bPoHcd1TueNjWSkg6

Post #558052 17th Jun 2020 5:59pm
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2180

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver

I’d definitely do the plugs they look old although doubt it’s causing this particular issue have you done the genuine maf yet? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #558121 18th Jun 2020 12:17pm
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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 293

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

i did plugs. am waiting on delivery atm, eurocarparts only has delphi and not denso.

Post #558122 18th Jun 2020 12:18pm
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2180

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver

Don’t even bother with Delhi-

Message duckworth parts on here and you’ll get the forum discount on a denso maf it’s the only way to do it right. Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #558123 18th Jun 2020 12:25pm
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400-ascona



Member Since: 25 Jan 2018
Location: Midlands
Posts: 65

United Kingdom 2005 Range Rover Supercharged 4.2 SC V8 Java Black

This was the leak on my engine that caused it to run lean. Couldn't detect by the usual methods.



The end of the pipe has an O ring, so not sure why it didn't seal



This is where it connects (connection the other side on an FFRR, this is from a Jag XKR)



And this is my less than elegant temporary fix



 05 L322 4.2SC
2016 Discovery 4 Graphite
Lotus Carlton
Ascona 400
Volvo V70R AWD manual
Suzuki 1200 Bandit
Velocette Venom
BMW R80/7
Daimler V8 250
Mini Cooper S Works 2006

Post #558211 19th Jun 2020 7:34am
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1263

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Same issue on mine at the pcv
Crap design, wrapped with self amalgamating tape to resolve

Post #558218 19th Jun 2020 8:04am
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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 293

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

Would a smoke test not show the problem? Also doesnt explain why it only errors on 1 bank on LPG. Am getting GAP tool today, and maf on monday hopefully. So can also install new sensors and clear adaptive values.

Post #558219 19th Jun 2020 8:09am
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400-ascona



Member Since: 25 Jan 2018
Location: Midlands
Posts: 65

United Kingdom 2005 Range Rover Supercharged 4.2 SC V8 Java Black

Mine only had the code on LPG and on one bank. It was fine on petrol.
I think the answer is in the fueling map overlay for the LPG system. LPG has a lower calorific value than petrol, so you have to put more LPG in to get the same bang as petrol. LPG systems tend to run a little leaner than petrol (certainly on mine it does but normally the fuel trims are able to correct fueling to obtain a good mixture). But with the leak, on petrol, the fuel trims are able to accommodate the air leak influence. However, on LPG the trims don't have enough authority to pull the fueling back in, so you get a lean code.
Either way, mine ran fine on petrol, but was lean on 1 bank with LPG. I sprayed brake cleaner around and had no change in engine speed, so assumed no leak. Rebuilt my supercharger and replaced all inlet gaskets and the PCV pipe (£100+ !) etc at the same time, still lean on LPG only. Installed the 22mm rubber hose on the PCV system with a couple of jubilee clips and not a single problem since, on petrol or LPG.
The other option is that the fuel map on your LPG system is incorrect. However, if it worked fine before, its something else at fault as the software is deterministic (always does the same thing).
Hope this helps. Rob 05 L322 4.2SC
2016 Discovery 4 Graphite
Lotus Carlton
Ascona 400
Volvo V70R AWD manual
Suzuki 1200 Bandit
Velocette Venom
BMW R80/7
Daimler V8 250
Mini Cooper S Works 2006

Post #558223 19th Jun 2020 8:52am
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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 293

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

ah so get this. on petrol both banks are lean, only lpg, only bank 1 is lean

Post #558224 19th Jun 2020 8:55am
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400-ascona



Member Since: 25 Jan 2018
Location: Midlands
Posts: 65

United Kingdom 2005 Range Rover Supercharged 4.2 SC V8 Java Black

And if it helps, the reason I know my LPG system fuels leaner is because I can watch the fuel trims increase when I change from petrol to LPG as they richen the mixture to achieve the correct fueling. The result is the fueling is OK, as long as the adjustment is within the authority the trims have.
Rob. 05 L322 4.2SC
2016 Discovery 4 Graphite
Lotus Carlton
Ascona 400
Volvo V70R AWD manual
Suzuki 1200 Bandit
Velocette Venom
BMW R80/7
Daimler V8 250
Mini Cooper S Works 2006

Post #558225 19th Jun 2020 8:56am
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2180

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver

Did it run rough or idle rough or just throw the code? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #558226 19th Jun 2020 8:59am
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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 293

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

Just threw the code. It did onetime idle a bit rough, but i think thats due to deviation in fuel trims between petrol and lpg. so i cleared the errors, put 20quid of petrol in there and went for a hard drive. issues came back, so waiting on the maf and gap to turn up

Post #558227 19th Jun 2020 9:00am
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400-ascona



Member Since: 25 Jan 2018
Location: Midlands
Posts: 65

United Kingdom 2005 Range Rover Supercharged 4.2 SC V8 Java Black

mgrover wrote:
ah so get this. on petrol both banks are lean, only lpg, only bank 1 is lean


If you get no code on petrol, its probably because the trims can cope with the leak. Why it throws a code on only one bank for the LPG scenario (same as mine) is something I cant get my head around unfortunately! It may be down to the mapping in the LPG ECU having a bias one way or the other, it may not.

If you get a code on both, then it may be that any leak is gross enough for the fuel trims not to have enough authority on either fuel.

I think the pipe cost me £14 for a couple of metres delivered, so it was a cheaper fix than plugs etc!
Rob 05 L322 4.2SC
2016 Discovery 4 Graphite
Lotus Carlton
Ascona 400
Volvo V70R AWD manual
Suzuki 1200 Bandit
Velocette Venom
BMW R80/7
Daimler V8 250
Mini Cooper S Works 2006

Post #558228 19th Jun 2020 9:02am
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mgrover



Member Since: 03 May 2020
Location: Leeds
Posts: 293

United Kingdom 2011 Range Rover Vogue TDV8 Santorini Black

ill give it a shot when my other fixes dont pan out Razz its a bit of an annoying issue since it only occurs in certain parts of the rev range but never when idling

Post #558231 19th Jun 2020 9:30am
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400-ascona



Member Since: 25 Jan 2018
Location: Midlands
Posts: 65

United Kingdom 2005 Range Rover Supercharged 4.2 SC V8 Java Black

Mine never happened on idle. Once I was driving, initially it only happened when I drove faster, if I drove very steady it was OK. However, once I fitted the expensive (did I mention that !) OE pipe, I think the leak got worse and it happened every time I drove it pretty much. 05 L322 4.2SC
2016 Discovery 4 Graphite
Lotus Carlton
Ascona 400
Volvo V70R AWD manual
Suzuki 1200 Bandit
Velocette Venom
BMW R80/7
Daimler V8 250
Mini Cooper S Works 2006

Post #558233 19th Jun 2020 9:34am
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