Omega Owners Forum - Won't idle on LPG, but revs fine

JamesV6CDX

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Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather

Won't idle on LPG, but revs fine
30. Sep 2007 at 18:17

My new project car, Elite V6 - runs well on gas, but refuses to idle on it, just cuts out.

It's an older type LPG kit, injected into the inlet -

Car has an oil cooler failure, and I have flushed out the evaporator (if that's what it's called) and hardly and crud came out.

Fine on petrol, just gas.

Constructive ideas / suggestions most welcome Thumbs Up!

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Taxi Driver Omega Lord Offline OOF Holly Dog Posts: 8413 Swindon Gender: Drives: Fiat Scudo 90 Multijet (whatever that means!)	Re: Won't idle on LPG, but revs fine Reply #1 - 30. Sep 2007 at 18:27 Sounds a bit like too much gas pressure......is it a mixer system then? .....i think those systems adjust somewhere on the lpg pipework. the vac pipe going to evapourator check for vacuum.
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JamesV6CDX

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Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather

Re: Won't idle on LPG, but revs fine
Reply #2 - 30. Sep 2007 at 18:29

Taxi Driver wrote on 30. Sep 2007 at 18:27:

Sounds a bit like too much gas pressure......is it a mixer system then? .....i think those systems adjust somewhere on the lpg pipework. the vac pipe going to evapourator check for vacuum.

There is no Vacc pipe... and nowhere for one to go Undecided

If it's too much pressure, how can I reduce it?

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The Cambelt Kid

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Posts: 564
Derby
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Drives: DIY LPG'd 2.6 MV6

Re: Won't idle on LPG, but revs fine
Reply #3 - 30. Sep 2007 at 18:42

My kit has a reducer/shut off valve in one and then it sends reduced liquid lpg to the evaporator, hot gas from here to the injectors. So if yours uses simular kit (bar the injectors) then i would have thought you would have a shut off valve/reducer before the evaporator. Also can you confirm that the reducer is getting hot enough? Do you have enough coolant in the system as lack of this could cause the evaporator to run cooler.

Also one other thing - Have you had a flat battery recently? maybe the flat battery caused the LPG ECU to reset to factory defaults...

Cheers
M

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Project LP6 has landed!

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JamesV6CDX Ex Member Gender: Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather	Re: Won't idle on LPG, but revs fine Reply #4 - 30. Sep 2007 at 18:56 Do the older systems like this one Have ECU's with adjustable parameters? If so, wonder if I could pinch Martin's lead and see what's going on....
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Taxi Driver

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Re: Won't idle on LPG, but revs fine
Reply #5 - 30. Sep 2007 at 18:59

JamesV6CDX wrote on 30. Sep 2007 at 18:29:

Taxi Driver wrote on 30. Sep 2007 at 18:27:

Sounds a bit like too much gas pressure......is it a mixer system then? .....i think those systems adjust somewhere on the lpg pipework. the vac pipe going to evapourator check for vacuum.

There is no Vacc pipe... and nowhere for one to go Undecided

If it's too much pressure, how can I reduce it?

TBH i didnt know wether there would be one on a mixer system.

As Omega2000w says they'll be a adjustor valve somewhere.....it'll be gas by the time it gets to the evapourator.....but theres a point as you've just flushed it......make sure the evap is getting red hot.....it should be too hot to touch.....just in case you've got an airlock Thumbs Up!

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Taxi Driver

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Re: Won't idle on LPG, but revs fine
Reply #6 - 30. Sep 2007 at 19:06

JamesV6CDX wrote on 30. Sep 2007 at 18:56:

Do the older systems like this one Have ECU's with adjustable parameters?

If so, wonder if I could pinch Martin's lead and see what's going on....

I would think it would be......for setting up etc......but it wont be adaptive.

Best way to check......find the ECU.....if its programable.....there will either be a socket on it or a flying lead with a socket on the end......either way nothing will be plugged into it.

Think Martin's lead/software will be for a different ECU.....unless yours is a Romano system

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« Last Edit: 30. Sep 2007 at 19:09 by Taxi Driver »

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Martin Imber

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LPG Omega V6 - Keyfobs
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Drives: 2001 Omega 2.6CD LPG & 3.0 cams

Re: Won't idle on LPG, but revs fine
Reply #7 - 30. Sep 2007 at 20:55

JamesV6CDX wrote on 30. Sep 2007 at 18:17:

My new project car, Elite V6 - runs well on gas, but refuses to idle on it, just cuts out.

It's an older type LPG kit, injected into the inlet -

Car has an oil cooler failure, and I have flushed out the evaporator (if that's what it's called) and hardly and crud came out.

Fine on petrol, just gas.

Constructive ideas / suggestions most welcome Thumbs Up!

You did do the gas side didn't you?

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The other tuned 2.6. DIY LPG, towbar, upgrade ICE & Wing Spoiler, Air shocks, Eibach Pro Springs, Poly WB bushes, WIM setup, HID conversion, 3.0 cams, ported ect.

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Martin Imber Over Active Poster Offline LPG Omega V6 - Keyfobs Rebuilt Posts: 20110 Worcester Gender: Drives: 2001 Omega 2.6CD LPG & 3.0 cams	Re: Won't idle on LPG, but revs fine Reply #8 - 30. Sep 2007 at 20:56 JamesV6CDX wrote on 30. Sep 2007 at 18:56: Do the older systems like this one Have ECU's with adjustable parameters? If so, wonder if I could pinch Martin's lead and see what's going on.... See if it has an ECU first, my lead suits most SGI systems - so may not do yours, but you are welcome to try it
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Martin Imber

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LPG Omega V6 - Keyfobs
Rebuilt

Posts: 20110
Worcester
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Drives: 2001 Omega 2.6CD LPG & 3.0 cams

Re: Won't idle on LPG, but revs fine
Reply #9 - 30. Sep 2007 at 20:57

Taxi Driver wrote on 30. Sep 2007 at 19:06:

JamesV6CDX wrote on 30. Sep 2007 at 18:56:

Do the older systems like this one Have ECU's with adjustable parameters?

If so, wonder if I could pinch Martin's lead and see what's going on....

I would think it would be......for setting up etc......but it wont be adaptive.

Best way to check......find the ECU.....if its programable.....there will either be a socket on it or a flying lead with a socket on the end......either way nothing will be plugged into it.

Think Martin's lead/software will be for a different ECU.....unless yours is a Romano system

Quite a few systems use the same base so it is worth a try, the Romano lead will do OMVL for example

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The other tuned 2.6. DIY LPG, towbar, upgrade ICE & Wing Spoiler, Air shocks, Eibach Pro Springs, Poly WB bushes, WIM setup, HID conversion, 3.0 cams, ported ect.

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JamesV6CDX

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Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather

Re: Won't idle on LPG, but revs fine
Reply #10 - 30. Sep 2007 at 21:18

Martin Imber wrote on 30. Sep 2007 at 20:55:

JamesV6CDX wrote on 30. Sep 2007 at 18:17:

My new project car, Elite V6 - runs well on gas, but refuses to idle on it, just cuts out.

It's an older type LPG kit, injected into the inlet -

Car has an oil cooler failure, and I have flushed out the evaporator (if that's what it's called) and hardly and crud came out.

Fine on petrol, just gas.

Constructive ideas / suggestions most welcome Thumbs Up!

You did do the gas side didn't you?

do the gas side? Sorry to be thick, I don't follow....

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tunnie

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Re: Won't idle on LPG, but revs fine
Reply #11 - 30. Sep 2007 at 21:21

JamesV6CDX wrote on 30. Sep 2007 at 21:18:

Martin Imber wrote on 30. Sep 2007 at 20:55:

JamesV6CDX wrote on 30. Sep 2007 at 18:17:

My new project car, Elite V6 - runs well on gas, but refuses to idle on it, just cuts out.

It's an older type LPG kit, injected into the inlet -

Car has an oil cooler failure, and I have flushed out the evaporator (if that's what it's called) and hardly and crud came out.

Fine on petrol, just gas.

Constructive ideas / suggestions most welcome Thumbs Up!

You did do the gas side didn't you?

do the gas side? Sorry to be thick, I don't follow....

Flushed gas side??? Undecided

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Do you break V6's as often as TheBoy? Then you need tunnie's towing services, recovery costs are just the humiliation of being towed by 2/3's of an engine

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JamesV6CDX

Ex Member

Gender:

Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather

Re: Won't idle on LPG, but revs fine
Reply #12 - 30. Sep 2007 at 21:24

tunnie wrote on 30. Sep 2007 at 21:21:

JamesV6CDX wrote on 30. Sep 2007 at 21:18:

Martin Imber wrote on 30. Sep 2007 at 20:55:

JamesV6CDX wrote on 30. Sep 2007 at 18:17:

My new project car, Elite V6 - runs well on gas, but refuses to idle on it, just cuts out.

It's an older type LPG kit, injected into the inlet -

Car has an oil cooler failure, and I have flushed out the evaporator (if that's what it's called) and hardly and crud came out.

Fine on petrol, just gas.

Constructive ideas / suggestions most welcome Thumbs Up!

You did do the gas side didn't you?

do the gas side? Sorry to be thick, I don't follow....

Flushed gas side??? Undecided

All I flushed were the coolant elbows...

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Marks DTM Calib Administrator Offline Ex Member Posts: 25671 Northern Hemisphere Gender: Drives: Astra J, Mum Bus, Dexta Tractor, 108 DMU wip	Re: Won't idle on LPG, but revs fine Reply #13 - 30. Sep 2007 at 21:27 It appears that generally there is more crud in the gas side (certainly was on mine!) which Martin says is from the artificial smell (so it Garlic!). Given you have an idling fault, I suspect that the pressure might be a bit high....which is what happened on mine!
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JamesV6CDX

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Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather

Re: Won't idle on LPG, but revs fine
Reply #14 - 30. Sep 2007 at 21:28

Marks DTM Calib wrote on 30. Sep 2007 at 21:27:

It appears that generally there is more crud in the gas side (certainly was on mine!) which Martin says is from the artificial smell (so it Garlic!).

Given you have an idling fault, I suspect that the pressure might be a bit high....which is what happened on mine!

I guess only removal, disassembly and inspection will tell, then!

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