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Jeep cherokee with U/S lpg conversion - petrolhead
Hello all, anybody got the knowledge on LPG conversions? Its a Millenium system about 3 years old. It will run the car ok for a few miles then almost shuts off. ( Car will just idle only) Car runs ok on petrol. Diagnostic inconclusive. Ive re-earthed the solenoids, renewed the stepping motor and substituted a new solenoid for each of the 3 in turn. No effect. Most installers dont want to know if they did not fit the system, but much more of this and Ill take the whole lot off!!!!
Jeep cherokee with U/S lpg conversion - Big John
Just in case check for a good old fashioned air leak around the inlet manifold, can cause havoc. squirt a thick washing up liquid mixture around manfold gaskets to see if you get an improvement.

Doesnt affect petrol operation greatly as the petrol injectors are after the inlet manifold.
Jeep cherokee with U/S lpg conversion - petrolhead
Thanks Big John, Ill try anything now. Petrolhead
Jeep cherokee with U/S lpg conversion - Rosanbo
You may know more than me (highly likely) but I would not put washing up liquid onto any potential leak on an inlet manifold. I think I would be inclined to use petroleum grease or a thick oil.

Petrolhead,
After a few miles does it idle despite you pressing the accelerator pedal? or does it idle and if you press the pedal then the engine cuts out? Former - some sort of cpu problem with the millenium box maybe. Latter problem-maybe the plug leads (put a cheap set on if you get success then put a new good set on).

Have you tried the newsgroups on usenet there is a UK LPG group with a lot of knowledge available.

Jeep cherokee with U/S lpg conversion - Rosanbo
or plugs
Jeep cherokee with U/S lpg conversion - Cliff Pope
You may know more than me (highly likely) but I would
not put washing up liquid onto any potential leak on an
inlet manifold. I think I would be inclined to use petroleum
grease or a thick oil.


Squirt of WD40 using the red extension tube is the standard dodge. The engine speed changes if any propellant gets sucked in through a leak.
Jeep cherokee with U/S lpg conversion - Dynamic Dave

Found this in the archives. Not sure if they're still in business or not.

www.honestjohn.co.uk/forum/post/index.htm?v=e&t=91...1

Jeep cherokee with U/S lpg conversion - Rosanbo
Found this in the archives. Not sure if they're still in
business or not.
www.honestjohn.co.uk/forum/post/index.htm?v=e&t=91...1


Decent and capable they may be but "LPGA approved" doesn't mean anything in the LPG world. likewise "Not LPGA appoved" also doesn't mean anything.

Both groups can have good, excellent and bad fitters.
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was kev_is_here
Jeep cherokee with U/S lpg conversion - nick
Decent and capable they may be but "LPGA approved" doesn't mean
anything in the LPG world. likewise "Not LPGA appoved" also
doesn't mean anything.
Both groups can have good, excellent and bad fitters.
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was kev_is_here


It means a lot to your insurance company. I converted a Jeep once and they'd only entertain a properly certified installation.
Jeep cherokee with U/S lpg conversion - petrolhead
Thanks everbody, if you can stand the boredom here is the latest. I am an engineer so plugs, leads, air leaks etc had all been investigated. Thanks anyway. Monday I took it to a specialist who had a diagnostic. He said the settings were all over the place, reset everything, and we took it on a short test drive connected to the laptop, all was fine. It lasted untill I'd paid the bill, got 2 miles from home, then packed up. Its obviously gas starvation, and Im guessing that the gas ECU itself may be at fault, otherwise how did the settings come to be wrong anyway, (its been running OK for 3 years after all) Does seem to tie in with unit getting hot from engine etc. The only other reasonable suggestion has been a split diaphram in the evaporator, but if that was the fault then surely it would not run at all. Anyway back to the specialist next week. Thanks for the suggestions.
Jeep cherokee with U/S lpg conversion - Rosanbo
It means a lot to your insurance company. I converted a
Jeep once and they'd only entertain a properly certified installation.


You still get a certificate from whoever installs it.

If the insurers want an LPGA cert....

First Argue with your insurance company that if you have a certificate of installation certifying that it is in accordance with LPGA COP11 then that should be good enough for them. Because trading laws require that it is what it says it is.


If they still have their head up their backside, go to a different insurer. If you don't want to change insurer then pay 50 quid to an lpga guy to check it and give you a cert. Which they will do, but this is where it gets stupid, because under LPGA rules a fitter has to have undergone training (yeah right!) on a certain system e.g. 'Millenium' in order to be able to install that system. In other words that fitter can't install a 'Ricardo' system under the LPGA scheme. But many of them do install different systems without retraining, and many of them will issue certs for systems they have checked but not fitted (for insurance purposes) and those systems will more often than not be ones they are not certified to fit.
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was kev_is_here
Jeep cherokee with U/S lpg conversion - nick
Which? magazine did a survey of lpg conversions. There were many with problems but none from LPGA-approved installers. Their advice? Stick to LPGA, you might be fine elsewhere but why take the risk?
Jeep cherokee with U/S lpg conversion - Rosanbo
Well they obviously didn't come to the one I know of who has made some dangerous errors. and just getting one conversion done isn't a very good sample.

I would like to read the report though, can you tell where you saw it, what mag & issue?
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was kev_is_here