Strange LPG Problems

[I Love My Landy!]

G'day everyone!

I have been having these strange problems with my LPG system in my 84 V8 County for years. When i brake hard, drive down a steep hill, or take right hand corners at speed, the motor begins to run very rough (rough enough to stall), and it takes a good bootful and around 5 seconds for it to run properly again. Is the motor 'flooding' with gas? I can fix the problem a little by adjusting the sensitivity, however i lose too much power. It also has a strange habit of idiling perfetly one day, but not at all the next. Also sometimes when i switch onto gas it will run but wont idle below ~1500prm, so i have to switch back to petrol then back onto gas again.

Does anybody know what might be going on?

Thank you in advance!

Edward
Oh and it's a Renzo Landi regulator if that helps.

[ozscott]

Hi Edward. I have had problems with both Landi Renzo and other makes gumming up from the black crud that is left when LPG is converted from liquid to vapour. In my vehicles it tends to cause change over when cold problems and high end power loss (ie flow restriction at the top end and inflexible valve control at the bottom end). So my symptoms are different to yours, but if yours is years old it could well be just gum in the converter. You could pull it apart and put a seal kit through it, but essentially the diaphragms get stiff and you cannot do much about that...probably cheaper to replace the converter. A simple converter should be about $200 - $250.00.

Cheers

[djam1]

I have a similar issue with my stage1 when going down really steep hills the carbies get flooded with petrol from the rear fuel tank,
I presume that this happens because of the fuel return line. I dont have the issue with turning corners though

[I Love My Landy!]

Thank you ozscott and djam1!

Yes ozscott my convertor is pretty old, so i will have a look at it. If i was to replace it, would you recommend any certain brands?

[Disco_owner]

I had the same issue on my RRC , when braking hard or approching set of lights slowing down to stop the car would stall and like you said it takes a good bootful to get the engine going again , I removed the front cover of my air filter unit and it seems to have solved this mystry , it almost seems like air pressure behind the airfilter box & the LPG converter is unbalanced and LPG converter cuts out Gas into intake manifold because of this????

However I still have to tap into the Intake airfeed and run a Hose back to the Convereter balanced feed and I'm told it will not stall again... I'm yet to experience this first hand.

[mark2]

I recently stripped and cleaned a 20 year old Landi Renzo converter.
Surprisingly, the diaphragms were OK and after a good dose of carby cleaner and re-asembling, all was good again - as in no more idling problems.

I'd never pulled one apart before, but it was quite simple.

Worth a try.

[LandyAndy]

Hi Disco Owner
The Mrs complains of the same issue in her RRC.
Sent it to get tuned by a mate but still isnt good,he turned the snorkel top around,obviously for a similar reason.Will look into removing the end of the aircleaner.
Thanks
Andrew

[scarry]

I had the same issue on my RRC , when braking hard or approching set of lights slowing down to stop the car would stall and like you said it takes a good bootful to get the engine going again , I removed the front cover of my air filter unit and it seems to have solved this mystry , it almost seems like air pressure behind the airfilter box & the LPG converter is unbalanced and LPG converter cuts out Gas into intake manifold because of this????

However I still have to tap into the Intake airfeed and run a Hose back to the Convereter balanced feed and I'm told it will not stall again... I'm yet to experience this first hand.

Happened to my work van as well,gas fitted when new,around 2.5yrs laterhad trouble idling,used to stall every now & then intermittently.Gas mech fitted hose from airbox to converter,and it has been ok since

He said hose should have been on since new.

Dont know why it ran ok for first 2.5yrs with no probs.
Though possible diaphrams in converter were getting a bit hard or worn,so needed the balance line

[Disco_owner]

Hi Disco Owner
The Mrs complains of the same issue in her RRC.
Sent it to get tuned by a mate but still isnt good,he turned the snorkel top around,obviously for a similar reason.Will look into removing the end of the aircleaner.
Thanks
Andrew

Hi Andy;

it's worth a try


This was set up when engine kept stalling

This is the set up now,,no more stalling ......


Definitely worth a try...

The 90 degree fitting on back of LPG convereter will need to attach itself somewhere on back of air filter unit

Permanant solution is to drill a hole an TIG up a Stainless steel fitting behind air filter unit and run a air pressure sense line back to LPG converter as I mentioned , hopefully it will work , I will let all you guys know what happends one way or the other.




Edit : Scarry I just saw your post , i agree the air hose from LPG should have been installed to the Aitfilter unit on intial install ,but wasn't , even without the Snorkle present it kept stalling , thankfully this is no longer the case

[LandyAndy]

Thanks for that man.
Ours is different,but its not here at the moment to compare.That fitting on the converter is plumbed into the snorkel on ours.
Thanks
Andrew