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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2214

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

Quote:
Strong concetration of bg44k fuel cleaner will help you, it did solved constant missfire codes on my 4.4 ajv8



I put a can in with 1/4 tank of petrol and after about 10 miles I kept getting rich faults in both banks I drove it a bit longer then chickens out and put half a tank of petrol in Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #605999 8th Sep 2021 11:11pm
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

So mechanic checked the cats and sees nothing wrong with them apparently.

Misfires on every cylinder however mostly across 1357 which apparently isn't on the same bank on the Supercharged.

Banks are allegedly split like this....

1234
5678

Only misfires at idle according to live data collected.

Sheesh. Big Cry Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #606147 10th Sep 2021 10:30pm
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1339

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Banks are 1357
2468

Post #606161 11th Sep 2021 7:03am
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2214

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

Dingg is correct the mechanic is quoting the BMW order.

If you put your foot flat down with the windows open do the cats stink Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #606236 11th Sep 2021 9:28pm
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

Thanks Gents for confirming the cylinder pattern. I can't thrash engine atm after engine rebuild for a bit. Apparently. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #606291 12th Sep 2021 3:34pm
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JavaBlack



Member Since: 07 Sep 2016
Location: UK
Posts: 67

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Java Black

Have you checked the fuel pressure?
This can be measured by the fuel pressure sensor via the OBD2.
A good reference: https://www.rangerovers.net/threads/4-2-li...ue.345359/

Post #625333 4th Mar 2022 4:23pm
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

So misfires only on 1357 on one bank now after sorting air leaks on engine. However I have had it confirmed the valve clearance is further out of tolerance after engine rebuild. So also have had trouble when starting in colder weather which also relates to valve clearance issues again apparently.

Fuel pressure via ODB2 tool is all good. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #625334 4th Mar 2022 4:27pm
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2214

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

Have you been in contact with the place that rebuilt it?

Dare I ask if it’s worse now that prior to the rebuild? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #625401 5th Mar 2022 10:37am
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

Yes but they won't offer a resolution to valve clearances.

I tried swapping plugs over and coil packs but still the same so surely its internals. So I will update when I have more info. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #625406 5th Mar 2022 10:42am
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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2214

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

If you hired them to do a specific job and it’s still not done surely you have a case for the small
Claims court if it eventually came down to it…

Did they reshim it or change the buckets? Guessing both banks? What did you pay if you don’t mind me asking, Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #625407 5th Mar 2022 10:52am
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black


They only relapped the valves so dont believe any bucket or shim changes were made.

Please see attached pre and post valve clearance measurements. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #625560 6th Mar 2022 8:51pm
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

Could these misfires be caused by valve clearances being way out of tolerance? Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #625562 6th Mar 2022 8:53pm
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dhallworth



Member Since: 10 Oct 2011
Location: Glasgow
Posts: 3061

United Kingdom 2012 Range Rover Autobiography TDV8 Baltic Blue

Have you checked compression?

This guy here had problems with his car misfiring when cold. He checked compression and found he had issues and then moved on to check his valve clearances from there and that was when he found problems.

https://www.lpgforum.co.uk/viewtopic.php?t=16575

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Post #625565 6th Mar 2022 9:21pm
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friskydog



Member Since: 16 May 2018
Location: West Midlands
Posts: 70

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

The rebuilders said compression was fine after the rebuild as it's one of the tests they check after. However after requesting said data they seem to have misplaced the testing data somehow.

Interesting comment though. I will remember that thank you. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

Post #625568 6th Mar 2022 9:27pm
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dhallworth



Member Since: 10 Oct 2011
Location: Glasgow
Posts: 3061

United Kingdom 2012 Range Rover Autobiography TDV8 Baltic Blue

If the valve clearances aren’t set properly then I’d hazard a guess at compression not being right either Sad

I’m hoping that mine has been cured by fixing an air leak but won’t know for sure until it’s back together as mine misses when cold too.

The guy in that thread reckons sorting his valve seats himself cost him £4K so I’m praying it’s nothing sinister on mine at the moment.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Post #625569 6th Mar 2022 9:30pm
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