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[feeutfo]

well, i think thats the possibility...?

With the warmer weather we had at the beginning of last week i had the cc temp set much lower than usual, and noticed, but didnt twig the possible connection, that the lpg was taking much longer to switch over when the engine temp was well off the bottom of the dash gauge. It usually changes over at the same point 2 or 3 minutes from my house on the work journey.

Anyway i checked the switchover temp on tuesday ish and found it set at 20. Which would explane the 2 occassions when it started miss firing after the set 6 seconds on gas on start up at work on a really hot day. I reset it to 55 degrees and wondered if changing the cars battery would have up set the gas ecu settings?
 Should i pull the lpg fuse first, next time the battery is disconnected?

 I ran the car for the rest of the week and no more early switch overs on a hot day but it still took a long time to switch over from cold on early mornings. I have had the cc set low all week. On one occassion it took 15 mins to switch to gas as i pulled off the m4.

So this weekend and another fiddle with the level gauge amp settings and watch the temp. 5 minutes have past. Still not switched to gas. The "Red"(reducer?) setting was still showing 30c but the car gauge was just short of the normal 80c. But the cc was set to 19c. So i turned it up to hi, flat out heat, and within a minute the "red" temp was up to 55 and it switched over to gas no problem.

I had a short drive yesterday in the rain and the cc temp set to 24 iirc and all seemed fine. But 24 on a boiling hot day will give different output from the cc so may get switch over issues then. What do you think?

Sorry bit long winded but didnt want to miss anything that may be relevant.

[Kevin Wood]

Hi Chris,

It was set to 20 when I looked at it so I don't think the settings are in error. They are stored in NVM so shouldn't be wiped out by a battery change.

It will run a bit moody if you let it switch over immediately after start. However, I find it's quite happy on gas at 20 degrees C vap temperature if you set the time to switchover a bit longer (say 30 seconds) so it has come off the worst of the after-start enrichment before it switches to gas.

(petrol engines need enrichment even when warm when starting due to fuel "wetting" the manifold walls whereas no problem exists for gas, hence it runs rich and lumpy)

I noticed your vapouriser wasn't getting much over 60 or so even when "pressing on" so 55 degrees is much too high for a switchover IMHO. 30 would be a more sensible figure but the key is a slightly longer time to switchover so it doesn't switch immediately after a start (be it warm or cold) IMHO.

I have never noticed a difference with the climate setting. Maybe coolant flow through your heater matrix or HBV is a bit slow? Might explain why the vap. was a bit cool? (although I should have a look at mine and remind myself what it runs at).

Have a watch at the vap. temperature while you fiddle with the climate settings and see if you can spot a pattern?

Kevin

[feeutfo]

oh ok. Good job your memory works then, mine is quite clearly fubar!

Cheers Kev. :-)