The heater is that hot i cant bear it on full for too long. Until the temp gauge rises to 3/4 mark then it goes stone cold. After about 30 seconds temp gauge comes back to half way and heater is hot again.

Lpg was running fine last night, then this morning misfiring again on lpg. I wonder if theres an air lock between the matrix and vaporiser. I.e. when the air lock is at the vaporiser thats when the lpg dont work properly, vaporiser is the highest point of the system incidently.....

Depends where in the cooling system they spliced to get the vaporiser supplied. You can prove this by returning the cooling pipe work back to original once you do this if the coolant loss persists it is engine if it is then fine the problem lies with the log system. That would be my first port of call

The vapouriser is generally meant to be inserted into the cooling circuit at the supply or return pipe from the heater matrix to ensure its getting water supply all the time. This is what allows you to start on LpG with some systems as its getting water flowing over it straight away

As above take it out of the circuit and try it as its worth a shot. FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

Sounds like a stuck thermostat to me, warm heater to start with as it's closed, then sticking and not opening until it gets too hot, then dumping the cold water in the system into the mix so reducing the heater temp then when it's mixed in the heater comes back....

The LPG vaporiser will have a thermistor in it that stops it coming on until the temperature has got to a preset level 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-

Pete, thing is i'm confused why it doesnt do it all the time. I did 120 mile trip yesterday and the last five miles temp gauge went into the red. I pulled off into a layby and opened the bonnet as was previously feeling quite positive at 115 miles with no fault so expected to see top hose hanging off or something clearly causing the temp gauge in the red but no, nothing. Except a faint bubbling noise from the header tank and signs of water around the top. Checked oil and water levels today. It took 2.5 pints of water and 1.5litres of oil. Dont think im going to bother with the castrol magnetec for much longer as the rate its using it i think i might just buy a cheap barral of 15/40 that i use in the john deere!!!!

What sort of value would you guys put on a 03 4.4 with 118k miles lots of history and 8 months mot that needs an engine?

I'd say about £5k to be honest, maybe £6k if you hold out for a long time. FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

Donor car for a transplant?

Thanks for the thought but as far as i can make out the engine in the l322 is the m62tub44 fitted and was only fitted after about 2001 i have considered buying a doner 740 but dont know if i can be bothered. As you have to swap the sump, oil pump, chain covers, starter motor etc. If it was simple swap like for like then it would be straight forward. Its gonna be a day removing one engine, a day removing the other, maybe another day making one good engine out of 2 then a day re fitting it and another day check for leaks/trapped wires etc and scrapping the 740. Ok say a weeks work by myself and its gonna be a struggle on my own. Sadly i have bigger better (more profitable) projects i could spend a week of my time on which makes the 740 swap too much hassle.

Spoke to local bmw specialist not interested in rebuilding engine but has the tools and quoted head gasket replacement at about 2.5k assuming head gasket is at fault. Am still using it every day temp gauge not moved from halfway since tuesday so am unsure. Checked coolant level and oil level today both fine?!!

The mystery continues..... oh and eqicar have an engine, for 2.5k which is probably the best option. Or i ebay it.....

More trouble than it's worth, no matter the permutation?

Just waiting on the "for sale" ad....  Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI

Lpg problem .... what system do you have?

I reckon it is the injectors as some old systems they only last for 30000 then scrap.

That happened to mine. The car would start and run ok for a while. Then misfire.

It was not consistent when misfire started

Ran fine on petrol.

300 quid got me new injectors fitted and tuned in on my tartarini system Howard
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2002 4.4 V8 LPG Tartarini
Have RSW AllComms in Cheshire J17 M6 - happy to help.
*Gone: Classic Vogue SE Auto V8 3.9

Its an omvl system which has the gas pipe from the vapouriser split in two both go to two seperate units. Then from each unit it has four pipes, each going to each mannifold runner and is connected to something tapped into the intake. I assume this is the injector (my knowledge of lpg is limited) i suppose i could swap injectors and even the distribution unit from one bank to the other to prove which bits are defective.

However i can help but think i wouldnt mess with gas at home so i would rather not play with it on the car, best left to a pro i reckon.

Contraband, i really dont want to sell, thats what makes this such a hard decision, hence this thread, if it was a shonky discovery i would just bin it off but this l322 is such a lovely vehicle to drive, as silly as it seems, it would break my heart to get rid of a car i have wanted for such a long time. And since it is in daily use and none of the faults are getting dramaticly worse i suspect whatever is wrong its nothing major.

Today for example did 20 miles then in traffic at a roundabout temp gauge went up to 3/4 mark put the heaters on full, stone cold. After about 2 mins gauge came down to halfway and heater got hot. Bleedy thing..

Can't remember but have you had the cooling system pressure tested?? 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-

My system sounds the same layout as yours.

Might be worth finding your nearest service agent who might stick the diagnostic computer on it.

When the injectors wear, there timing gets sloppy - and the engine management tries to compensate for it and hunts through different values.

Eventually it gives up then you get the check engine light

However if it was my money I would prob sell and get another - have you seen the one for sale on here for £5k

http://www.fullfatrr.com/forum/topic26742.html

I think you were willing to spend 3k on the engine well for 2 more you got the full car. Howard
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2002 4.4 V8 LPG Tartarini
Have RSW AllComms in Cheshire J17 M6 - happy to help.
*Gone: Classic Vogue SE Auto V8 3.9

Still think it is worth taking the lpg out the equation by by passing in the cooling system completely remove the two t pieces then run on petrol and see what you get. I had a similar situation with a p38 and the vaporiser needed refurbing and I had a crack in a liner. If you do this it will show if it is lpg related or not