Wish I had not bought a range rover. The most amazing thing is the lack of knowledge and understanding even by trained technicians if u do get a problem all bloody cow boys.
I am getting p0171 and p0174 error codes and the symptoms I have mentioned in previous posts. Changed the following.

Super charger Auxiliary pump
Plugs
Pcv valve
Supercharged seal
Inlet outlet gaskets
Throttle body gasket
Checked coil packs/lambda sensors/maf sensor

Only thing left to do is update the PCM unit. Which a forum is going to
Help me out with after Christmas.

The Log installer tool out the install and put it back. It's doing it on petrol and LPG I can't believe I am the only person who has had this problem pulling my hair out.

I'm no expert on LPG but I have been tracking your tale of woe from when you first joined the forum.
Right from the off all the indications were that your conversion was not as good as it could have been.
Your second posting was telling us how badly sited your air suspension pump was situated.
I thought that was a good indicator of a shoddy installation where the fitting to mount the pump would have cost your installer another few quid and cut their profit so they just didn't bother.
You might be better off taking it to a reputable expert to rip the kit out and set it back to petrol or install a kit that they can support.
You are putting plasters on a broken leg

I appreciate what u are saying chap. Going to get PCM updated then I have no alternative but take it's elsewhere

Hi,I too have these codes on my 2003 LPG 4.4v8 ff.ive been told its the lambda sensors.my car suffered no ill effects for 18 monts now but the engine light is on.which is annoying but gonna replace sensors before January MOT.i would try the rear sensors post catb if I were you.only £45 each.if I can help with anything else give us a pm.cheers tony

Tallsaj - what issues are you seeing in your FFRR? Engine light etc?

Or was it just a routine check that brought up fault codes?

thanks

Hi,absolutely none.car runs like a dream to be honest.like I said the light is on and when it's read it displays the dreaded codes what u have p1074 and another .ive spoken to my indie and he says its a common fault.getting sensors next weekend so will update you if the codes post fitting are eradicated.im intrigued myself to see if they disappear.cheers tony

Gents try to get hold of a real LPG specialist, if possible one that has extensive experience with the make and type of the system in your car and FFRRs as well.

Because LPG can run very lean without any knocking issues (LPG has high octane number), it may be that the system is running too lean and the lambda sensors are picking that up. Since the normal fuel managment is not controlling the LPG, the ECU thinks there is a problem as it is trying to make the mix richer but no result hencenthe fault.

It may be that a simple adjustment ofnthe LPG mixture could resolve the issue. MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Gents the problem is there on petrol and log. I am pretty sure my car was running ok on petrol. I only drove it for a week on petrol when I bought the car and it went to have the lpg done around May 2013 and ever since then.probe. Initially I kept on going back and fro to the lpg fitter and then after 2 months of doing this he said lets try it on petrol and exact same probe if anything drove slight better on lpg than petrol. Like I have mentioned before its giving random misfires codes p0310 ad p0171/p0174. Well I only got 2 things left to do before I start going mad. Tomorrow going to get pcm updated and then whenever loss a smoke test to check for leaks. I still can't believe one else in the world has a SC with same prob as mine..

Considering that it started with the conversion could indicate that something went wrong right there. Something along the lines of intermittent false air or electrical connector/wiring damaged or damaged sensors.

Since the LPG fittter doesn't seem to be able to solve it, maybe time to find someone else. Someone with lots of FFRR experience and fault findimg. Have you got a good indy or dealer close by or have you asked Craig of Cam Tech ? MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

to the OP - has your LPG man mapped the lpg system properly at different loads , or has he just self calibrated the LPG ecu and hoped it would be ok?

the s/c engine is notorious for being hard to get to run on lpg properly without bringing in fault codes , it probably needs some time spent with him sitting in the passenger seat and comparing fuel trims at varying loads to see what is actually happening.

Tbh not sure I know originally he said U rev the car to 5000rpm for a while and he said the petrol ECU will adjust automatically but I know after he did try some manual adjusments even uploaded working software from a okay running SC sport because he said that was working perfectly.

Dingg1 could be on to something by the sounds of it. There are a few LPG conversions described on the forum where the programming was done on road. Maybe try one of those fitters to see if that helps. The SC engine management is notorious for needing a "perfect" mix. MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

The LPG fitter did all that he took out the system and put it back he even checked for air leaks with brake carb cleaner. He is willing to help. When he did mine in may last year it was the first one he had converted. At first he said will take week to do but I was surprised 2 days later when he said it was ready.I think since then he has 2 or 3 without any issues he says.

http://www.mpowerlpg.co.uk/

give this bloke a, ring he has been in the LPG fitting game for over 15 years now. he only fits prins systems on ff's because of fault codes showing up on other systems,
he is in tyseley in brum
nice honest bloke who knows his stuff
just might point you in right direction

Ok does any one know of any of any one who can help then I am situated in Birmingham its been a long going saga now and I went to finish the Chapter