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I do believe you, when you say Arnott give a spring rate...but.. the load is not constant is it? Load with driver only or driver passengers etc must be different? As the system automatically self levels the pressure within the air springs must change. Must admit I don`t now if spring rate is...

As you say yourself there is no "spring-rate". Any deflection due to load is compensated for by the system pumping in more air... And `tis spring here so my anorak is hung up `til november...I hope.

With a warm engine, let it tick-over for a good 5minutes, then rev `er up; blue smoke points to shot turbo. With a cold engine pull off air pipe to turbo; if you can feel movement of shaft it`s bad news, ditto if it`s swimming in oil in there, but a moist oil film is normal.

Faulty/weak lift pump?? When using the secondary fuel reservoir was this higher than the vehicle`s tank? Maybe a weak lift pump can`t supply enough fuel but with a gravity aided supply it can?

Or could there be two noises?? Anyway, easy to check/top-up power steering reservoir and so, hopefully eliminate that as a problem. If it does need topping up, that leak will be a job for your to do list tho. You say you trust your mechanic but maybe get someone else to check fluid levels to...

Sounds likely to be air in power steering system, probably due to leak/low level.

Look on rangerovers.net at he posts by "jsmooth65". long thread about his modded P38.

If fuel is there, then shouldn`t there be white unburnt fuel coming out of exhaust?? Check fuel filter, and if you`re confident/competent, crack off an injector pipe to check fuel reaching injectors. Only use correct spanner tho` to avoid damaging tightly done up injectors.

Yeah `tis crap, He`s claiming "up to" x% increases not x% minimum garantees, then banking on punters not bothering to chase him too hard to get refunds of 20quid. He stands to loose few quid on postage only if determined people chase him, but bet most will kid themselves they weren`t conned and...

As I understand it: turning over but not starting? No message on dash? Since it`s turning over it can`t be an alarm problem.(crosses fingers) Any smoke from exhaust when cranking? Is it turning over quickly, or just about getting there? Is it pre-heating as per normal? If manual any chance of...

Do you get any messages at all on message centre? If none,try to provoke an "alarm fault" message by disconnecting sensor then locking car, unlocking and re-entering, car. I should show as a fault. (just to find out or not if message centre is actually working).

To check for weak mixture keep an eye on your plugs` colour. Light/mid brown =good, no worries. Having had a K&N filter in the past I wouldn`t bother again: too messy to keep cleaning `em. Paper replaceable much easier for lazy gits like me.

Checked with "http://www.carbibles.com/tyre_bible_pg4.html" and changing from 255/55 18" to 255/60 18" will make a speedo reading of 70mph a genuine 73.4mph. Not a lot, but worth noting.

Correct. That is a vent/drain to let out any oil that leaks into bell-housing, preventing oil gettingonto clutch. If lots of oil around check oil levels in engine (of course we all do) and in the gearbox. To check level in gearbox, remove level plug and put in oil until it comes out.

NO. Not correct. Probably a poor seal on master cylinder. Firstly check fluid level on master cylinder before driving anywhere. Then consider professional assistance or help from someone more experienced than yourself. If you`re asking this question you probably ain`t ready to tackle this by...

Whoops ! Just noticed dates on this thread.... Wonder if the engine still going ....

IMHO: If your oil pressure light is coming on after startup then you`d be crazy to drive the vehicle more than you`ve got to until it`s sorted. Since you`ve replaced the switch you can safely assume it is working, except you don`t actually WANT to believe it. It is after all called a "Warning"...

If fitting a "PSI" box or similar keep checking your m.p.g.figures without using the on-board computer. The box "fires" extra fuel into the system "dowmstream" of the computer so it`s not aware of fuel being used. Would agree wih you it`s best to sort out any under-lying problems before...

Swopping a bigger intercooler in there will incrase nowt; except turbo lag. It will help as part of an upgrade including a bigger turbo and increased fuelling. Most cost effective mods could be a good service with new filters, or a 300tdi engine!

As above... But all you need do is follow the book as regards oil etc. Costs enough already without additives..