rangerovers.pub
The only place for a coil spring is up Zebedee's arse
Member
Joined:
Posts: 130

Hi @LPGC, you seem to be the god with LPG conversions (although same question is for anyone who knows LPG well). Mines started to switch over after a longer time than normal. It used to switch within about 2-3 minutes, temp needle just off the cold pin, however it's now at least 8 mins and engine temp needle is just under half way.

It's PRINS if that makes any difference!!

I've had a search for the diagnostic software but drawn a blank.

Thank-you in advance

Member
avatar
Joined:
Posts: 6012

What's the coolant level like? If it's low then you may have less flow so taking longer for the reducer to get up to temperature.

Member
Joined:
Posts: 130

Coolant level is correct. Check it weekly!

Member
Joined:
Posts: 1130

When you think it's warm enough to change over have a feel of the reducer to see if it feels warm, if it's mounted high up there could be an airlock in it.

Could be a problem with the reducer temp sensor or it's wiring.

Prins ignition (RPM sensing) modules often fail, the Prins VSI ECU's could be damaged by voltage spikes on the rpm wire, so if the system gets it's RPM feed from an ignition coil or from a cam sensor an RPM module is probably fitted. If the ECU doesn't see an RPM signal it will never change-over to LPG, and if it loses the RPM signal while running on LPG it may switch back to petrol without the driver knowing (no beeps from the switch etc). There are various types of Prins RPM module, something around matchbox size with a few wires coming out of it or something that looks very much like a relay.

Member
Joined:
Posts: 130

Thanks, I’ll have a poke around and see what lurks beneath all the cable ties and insulation tape!

Member
Joined:
Posts: 1130

Gilbert or others on LPG, please remind me what plugs you find are best in P38's? I've just been asked the same question in an email, he has Champion plugs in at the moment.

Member
avatar
Joined:
Posts: 6012

Ugh, Champions, how to make an engine misfire when there's nothing at all wrong with it..... if GEMS, NGK BPR6ES, if Thor NGK PFR6N-11.

Member
Joined:
Posts: 1130

Thanks Gilbert, I passed that info on to the owner. I recently advised this owner to join the pub forum.

Member
Joined:
Posts: 130

I’m using ngk’s