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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black
RRS 06 4.2 SC Lean codes

am running out of ideas. lean codes in both banks persist always together, its also managed to set off the knock sensor and has some misfires albeit no codes for them.

this is what's been done:

1. pcv replaced
2. maf replaced
3. both top ends rebuilt with hardened valve seats
4. pcm flashed to the latest update
5. air filter changed for a mann cross
6. dumped a lot of redex into fuel tank and cycled

anyone have anymore ideas? i think throttle body is next but that can be a bit of a ballache to get to. or fuel pump being Censored .

this car is hooked up to lpg but thats not working atm so i haven't been using it. the lean codes atm are strictly on petrol.

Post #593979 Wed Jan 29 2020 1:13pm
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Andy K



Member Since: 18 Sep 2015
Location: GL
Posts: 4752

England 2005 Range Rover Sport TDV6 HSE Rimini Red

these engines are a bit of a pain throwing lean and rich codes.

Check for vacum leaks

Post #593995 Wed Jan 29 2020 5:07pm
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

smoke test was done with no issues

Post #594001 Wed Jan 29 2020 5:36pm
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 1699

Wales 2005 Range Rover Sport Supercharged HSE Java Black

Make sure oil cap is seated correctly to as that can effect the air in the block or it did on mine Thumbs Up

Post #594025 Wed Jan 29 2020 10:15pm
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

seems to be sealed correctly but i noticed when i was trying to twist the cap closed the actual pipe twisted as well...could that be it?

also when am sat at idle, then just floor the Censored out of it at 5-6k revs I hear a thud. could that be a misfire and pointing even more to the fuel pump?

Post #594035 Thu Jan 30 2020 9:11am
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 1699

Wales 2005 Range Rover Sport Supercharged HSE Java Black

Not sure you can try and see if it helps Thumbs Up

Post #594036 Thu Jan 30 2020 9:21am
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

bit of an update on this, only thing left is the lambda sensors. i know everyone says they should be functioning fine if their throwing those codes because they've already done a wellness check. but there cheap enough to replace and am almost out of ideas.

Post #598900 Thu May 14 2020 8:02am
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Themoog



Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

United Kingdom 2005 Range Rover Sport Supercharged Rimini Red

My 4.2 sc 05 is on lpg and also has the lean mixture codes. I shall follow this thread with interest as I haven’t sorted mine..

Post #598988 Fri May 15 2020 9:40pm
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

ive done all sorts. supposedly it was VSR due to the lpg, but the heads been rebuilt with hardened valve seats so I doubt its that. i think next ama replace the sensors.

mines lean no matter if its lpg or not

Post #598992 Sat May 16 2020 5:46am
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 1699

Wales 2005 Range Rover Sport Supercharged HSE Java Black

Everyone said that to me too but was never sure the guy i used to have the lpg serviced checked it and said he could find nothing wrong and t actually ran cleaner on lpg than petrol but he did say if it was fitted and a wire was not connected 100% then maybe it's that what is causing the issue Thumbs Up

Post #598994 Sat May 16 2020 7:13am
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

could be. this point am going with lambda sensors though. the lpg system has been looked over by 3 different lpg technicians.

Post #599038 Sun May 17 2020 4:53pm
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

bit of an update to this.

so I was messing about with the car trying to make it throw codes. I held 3k rpm for 30 seconds and it threw cylinder 1 misfire codes, lean codes and the reduced engine performance(ive already replaced sc coolant pump). So am like huh, how about that.

So I go change plugs and swap coils for that cylinder.

Same thing happens again, but still cylinder 1, I managed to replicate it a good 4-5 times. So I thought what if I run the car on lpg, then do the same, held the revs at 3k for a good minute or two. No misfires, still throws lean code but I've a feeling that's more adaptation/map related.

So for now I've come to conclusion injector 1 is clogged. Only thing that would explain it really. I remember seeing a service bulletin for it somewhere which recommended bg44k so I've ordered some of that

Post #599233 Sun May 24 2020 3:37pm
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mgrover



Member Since: 17 Oct 2019
Location: Leeds
Posts: 393

United Kingdom 2006 Range Rover Sport Supercharged Java Black

another update. it was the maf. i thought it was a denso maf that came with the car, wrong. it was a Censored chinese one and the replacement chinese one i had was no better.

one denso maf later and all the lean codes went away.

now onto the next problem Razz

edit: i havent run it on lpg since. i wanna get the lpg reducer and injectors swapped out and then a full recalibration now the fuel trims are somewhat sane

Post #600935 Sun Jun 28 2020 10:59am
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geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 1699

Wales 2005 Range Rover Sport Supercharged HSE Java Black

Hopefully sorted then Thumbs Up

Post #600975 Mon Jun 29 2020 7:55am
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