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[Lazydocker]

Nope, that made bog all difference.
Still plays up badly between 65 and 80c engine temp.

With climate panel on today?

Try without tomorrow as it behaved yesterday with it off

Very curious though as there was nothing obviously wrong

If it worked OK with climate turned off (and if climate 'off' means that the HBV switches to bypass the heater matrix) then that points to resistance from the heater matrix causing reduced flow IMO.

I'd agree with that but if the reduced coolant flow was causing the issue it should show as a drop in vap temp, which doesn't happen

Easy check would be if the vap is iced when the problems occur

I just can't see anything obvious in the live data. As another thought... Having changed the temp sensor in the software to one that reads much nearer to the correct engine temp, that will probably have changed where the LPG switches in... Yet the issues are at the same coolant temp during warm up

[feeutfo]

No vap icing, I've checked.

[Andy H]

I have seen occasional references to 'heavy ends'. Is it possible that your vapouriser/pressure regulator is sticking before it is properly hot?

[Lazydocker]

I have seen occasional references to 'heavy ends'. Is it possible that your vapouriser/pressure regulator is sticking before it is properly hot?

Now that has potential, although with the settings you have I would be surprised... Mine switches much earlier and is fine

How many miles since converting this one Chris?

[feeutfo]

About 30k. Fitted may 2011.

Just to add, there is no issue on petrol at any point.
Problem only occurs in gas, between 65 and 80c, as rough running that gradually gets worse from switching to gas at 40c, to the point the car will not tun on gas at all. ...until it gets above 80c minimum, where all is well.

Although its now getting to the stage where it's quite grumpy the moment it switches over.

This has been a gradual decline for a few months.

[TheBoy]

Have you changed the filters in that time (liquid side or gas side)?

[Kevin Wood]

Have you got the auto mapping turned on? Just thinking that if it starts messing about switching back to petrol while it's not fully warmed up it might well get the hump.

[feeutfo]

Adaptions are on now, but where off before, no change.

Not changed any filters.

[Lazydocker]

Could it be as simple as needing filters/heavy ends draining

Can't see it needing Vapour Phase filters changing as I did over 40k on the last one (other car)

Could be liquid phase filter and/or heavy ends

Got to be worth a try

[feeutfo]

Seems coolent temp related to me, but worth a look.

[Lazydocker]

Seems coolent temp related to me, but worth a look.

I'd agree TBH... If it were heavy ends I would expect it to play up completely until warm, not be fine and then start playing up

[Marie]

Something odd is going on with your vapuoriser anyway, it was cooling off way too much on a long run at full running temperature IMHO.

I don't suppose you looked at the vapour pressure and vapouriser temperature when it was playing up on gas?

By way of balance, my vapouriser temperature sensor is knackered, so it's currently wired with a resistor to read 98 degrees C all of the time. It switches over to LPG at > 30 seconds since engine start when RPM > 2000. At the end of my road, in other words. I've been wondering if this would cause a problem in colder weather yet this morning, -2 Deg. C and I didn't notice it switch over.

As long as the vapouriser doesn't freeze up it will still work. Maybe not at full power but for normal driving. A good circulation of water at a few degrees above zero will provide enough heat to compensate for the LPG boiling off although you'll get a lot of heavy ends until the temperature gets up well enough. Propane boils at -40 C after all!

Mine also had a knackered thermostat for a while (gauge read about 75-80 unless in traffic) and the LPG setup worked fine.

I think there's a problem with the vapouriser or the plumbing to it, TBH.

Mine curently runs at this temp and has done so since i flushed the coolant and the vaporisor out. i have 2 ideas, the thermosat is on its way out that or its because i put the hoses on the bottom of the vap the wrong way round.she runs fine. gas kicks in as it should only gets up to temp (92- 95) when in traffic or running on petrol. if i switch back to gas the temp drops back down to 75 - 80.

[TheBoy]

Marie - PFL and FL read differently. 85-90 is correct cruise temp for FL, 93-95 is correct for PFL

[Marie]

Marie - PFL and FL read differently. 85-90 is correct cruise temp for FL, 93-95 is correct for PFL

cool so mine is still wrong ? mines a mini FL i believe. 

[Entwood]

Marie - PFL and FL read differently. 85-90 is correct cruise temp for FL, 93-95 is correct for PFL

cool so mine is still wrong ? mines a mini FL i believe. 

Apparently so ............