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friskydog

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

2007 Range Rover Supercharged 4.2 SC V8 Java Black

L322 2007 4.2 SC Timing Chain & Valve advice

Hi all TECHIES...

Please click here to view pictures relating to this topic.
https://drive.google.com/drive/folders/1Ug...sp=sharing
Let me know if you cannot access this link.

I have a few problems with my engine, my aim here is to ask for advice surrounding the following information from someone with a better pedigree than myself on this topic.

My vehicle is...
Range Rover Vogue SE L322 4.2 Supercharged 2007
AJV8 Engine
Prins VSI LPG system with auto doser.

I have a P0174 error code (lean bank 2) on my Range Rover.

I have 0.12mm clearances on some of my valves as shown. When minimum clearance is recommended at 0.18mm. Do these have tappets or shims and can they be manually replaced? however at what point do I consider rebuilding the engine.

My car current valve clearance (mm)

Bank 1 (offside)
Cyl 4
Inlet A - .178 Exhaust - .205
Inlet B - .178 Exhaust - .205
Cyl 3
Inlet A -.178 Exhaust - .205
Inlet B - .178. Exhaust - .205
Cyl 2
Inlet A - .127. Exhaust - .205
Inlet B - .127. Exhaust - .205
Cyl 1
Inlet A - .127. Exhaust - .127
Inlet B - .178. Exhaust - .178

Bank 2 (near side)
Cyl 4
Inlet A - .127 Exhaust - .229
Inlet B - .178 Exhaust - .278
Cyl 3
Inlet A - .127 Exhaust - .178
Inlet B - .127 Exhaust - .229
Cyl 2
Inlet A -.178 Exhaust - .229
Inlet B - .178 Exhaust - .229
Cyl 1
Inlet A - .127 Exhaust - .229
Inlet B - .178 Exhaust - .278

I also saw issue with chain shown attached whereby it looks as though its hitting inside engine upon cold start only when chain isn't under pressure/tension. As she runs like a dream. However there is a slight misfire upon cold start.

I would really appreciate someone technical reviewing this information and advising on a recommended course of action baring in mind this car is now like "Triggers Broom"...

It has brand new suspension all round.
Brand new disc/pads
Brand new tyres Pirelli P Zeros
Brand new steering rack
Brand new polybush throughout
Rebuilt and upgraded Supercharger
All rust to bodywork now remediated.

Love my car dont wanna get rid but wonder if there is anyway around rebuilding the engine? Advice very much appreciated. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

1st Jul 2021 8:12pm

kezbo1981

Member Since: 20 Jan 2015
Location: Evesham, Worc
Posts: 334

2006 Range Rover Vogue SE 4.2 SC V8 Buckingham Blue

How did you measure the valve clearances? What is the problem with the engine that has made you do this investigation?

2nd Jul 2021 7:39pm

friskydog

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

Hi Kezbo... i have a misfire and a P0174 lean bank 2 error code. Reasons for these checks is also because I run LPG and wanted to be proactive if I saw any possibility of Valve Seat Recession. I had also just replaced rocker cover gasket so thought it was a good time to check whilst I had rocker off.

I measured the valve clearances using a feeler gauge tool after removing rocker cover. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

3rd Jul 2021 4:53am

Haylands

Member Since: 04 Mar 2014
Location: East Yorkshire
Posts: 8190

2014 Range Rover Autobiography SDV8 Loire Blue

Does it throw the code on petrol and LPG or just one of them...

Can you measure fuel trims on both..??

Most common reason for that fault is worn out lambda sensors, but you need some more investigation first...

IMHO 0.06mm valve recession sounds normal for an engine that old running LPG... Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

3rd Jul 2021 8:26am

kezbo1981

Member Since: 20 Jan 2015
Location: Evesham, Worc
Posts: 334

Agree with Haylands re valve clearance and wouldn't necessarily jump to fix that to start with. Plus can you be sure of 0.06mm accuracy with a deeper gauge? If that is swarf near the timing chain that would be worth further investigation.

3rd Jul 2021 8:38am

friskydog

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

Haylands wrote:
Does it throw the code on petrol and LPG or just one of them...

Can you measure fuel trims on both..??

Most common reason for that fault is worn out lambda sensors, but you need some more investigation first...

IMHO 0.06mm valve recession sounds normal for an engine that old running LPG...

I believe it throws the code on both Petrol and LPG. Buy I will double check that.

Interesting about the Lambda sensors.

I suppose misfire is all thats left but could that be the chain timing causing the misfire maybe.

I have it booked in for a proper diagnostic but great nugget of info on Lambda Sensor, thank you for that 😀.

Maybe redoing the tappets/reshimming is a no brained if chains have to be done, like you say with an engine that's done 115k already. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

3rd Jul 2021 9:10am

friskydog

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

Swarf that's a new word for me. I had to Google it lol.

Investigate it in what way. To confirm the chain has caused it? Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

3rd Jul 2021 9:14am

Haylands

Member Since: 04 Mar 2014
Location: East Yorkshire
Posts: 8190

Are you getting missfire codes...?

If it's a missfire you usually get codes, fix the lean problem first and see what happens... Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

3rd Jul 2021 9:52am

kezbo1981

Member Since: 20 Jan 2015
Location: Evesham, Worc
Posts: 334

friskydog wrote:
Swarf that's a new word for me. I had to Google it lol.

Investigate it in what way. To confirm the chain has caused it?

The bit I've circled in blue, is that where the chain is wearing against the block? Hard to see clearly. If it is, that's not normal and you would need to inspect the chains, guides and tensioners.

Click image to enlarge

3rd Jul 2021 9:58am

friskydog

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

Haylands wrote:
Are you getting missfire codes...?

If it's a missfire you usually get codes, fix the lean problem first and see what happens...

Yes, one mechanic had the code but didn't note it down. They say you can feel the engine misfire on cold start especially. Haven't had any misfire codes reappear recently however. But upon cold start engine does wobble a bit and settles when warm. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

3rd Jul 2021 10:07am

kezbo1981

Member Since: 20 Jan 2015
Location: Evesham, Worc
Posts: 334

I think the feeling of a misfire on a very cold start is quite common on the 4.2 SC engine, mine does it and always has since I have owned it. Ive researched it before and concluded its a common thing, known ab oiut with a possible software update fix . Mine runs perfectly after 30 seconds or so and so I have never bothered doing anything about it. Make sure you are chasing an actual problem!

3rd Jul 2021 10:19am

Haylands

Member Since: 04 Mar 2014
Location: East Yorkshire
Posts: 8190

As Kezbo says they take some seconds to run clean...

If you get codes then it could be coil packs or sparkplug failure but no codes and IMHO it's not an issue....

Sort the chain out and take it from there... Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

3rd Jul 2021 10:31am

tb10

Member Since: 17 Feb 2015
Location: Bromsgrove
Posts: 337

2005 Range Rover Vogue 4.4 V8 Tonga Green

Kezbo: my MOT man describes this as a “7.5 cylinder V8” at start up and mine does the same as yours so I concur with you.

3rd Jul 2021 10:32am

friskydog

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

Thanks for all replies I will book her in for full diags. Like you guys say and relay the outcomes. As they say u never own a Range Rover you have a relationship with them.

Thanks again chaps. Range Rover Vogue SE 2007 L322 4.2 Supercharged 121k. Engine rebuilt @ 120666 Miles

3rd Jul 2021 11:00am

pcourtney

Member Since: 14 Jan 2020
Location: Stansted
Posts: 804

2011 Range Rover Vogue 4.4 V8 Sumatra Black

what Spark Plugs have you got in your 4.2 Supercharged ? are they Iridium and designed for LPG usage ?

https://www.sparkplugs.co.uk/iridium-spark-plugs

I changed to NGK LASERLINE IRIDIUM LPG on my BMW 4.4 and it made a big difference

it could be as simple as spark plugs before you go looking at coil packs etc

NB also your spark plugs might need changing anyway after 14 years

3rd Jul 2021 11:09am

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