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Author Topic: LPG Revs high?  (Read 3445 times)

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OpelJay

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LPG Revs high?
« on: 01 May 2013, 20:34:38 »
Short and sweet.. My Omega Duel Fuel more when it's warmed
Up, when you stop at the lights most of the time the revs can stick at 1500 if I give it a little rev it will most the time drop back to normal, it's not just on the idle as sometimes it can feel like a kind of cruise control for example driving at 30 put the clutch down and it's stuck at 1500 revs, I don't have this problem running on Petrol.
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zirk

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Re: LPG Revs high?
« Reply #1 on: 01 May 2013, 21:20:58 »
Air leak somewhere on the inlet side, is it a VX badged Duel Fuel on the back, Koltek from memory, lots of issues with them.
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zirk

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Re: LPG Revs high?
« Reply #2 on: 01 May 2013, 21:49:56 »
Just to add, if it is a VX from factory Duel Fuel, it will have a red / black button right side of gear change and the LPG Fuel Guage shares the same as the standard Petrol one.
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symes

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Re: LPG Revs high?
« Reply #3 on: 01 May 2013, 21:52:14 »
clean throttle body :y :y
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OpelJay

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Re: LPG Revs high?
« Reply #4 on: 02 May 2013, 00:03:59 »
Quote from: zirk on 01 May 2013, 21:20:58
Air leak somewhere on the inlet side, is it a VX badged Duel Fuel on the back, Koltek from memory, lots of issues with them.

No air leak it has been checked - again no problem on petrol
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OpelJay

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Re: LPG Revs high?
« Reply #5 on: 02 May 2013, 00:06:04 »
Quote from: zirk on 01 May 2013, 21:49:56
Just to add, if it is a VX from factory Duel Fuel, it will have a red / black button right side of gear change and the LPG Fuel Guage shares the same as the standard Petrol one.

Yer that's the one just as you described, I got told the other day I need new manifold gaskit but wouldn't of thought that would effect it should be ok.
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OpelJay

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Re: LPG Revs high?
« Reply #6 on: 02 May 2013, 00:06:59 »
Quote from: symes on 01 May 2013, 21:52:14
clean throttle body :y :y

Bin done and new TPS and new Idle control valve :)
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symes

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Re: LPG Revs high?
« Reply #7 on: 02 May 2013, 13:21:23 »
Quote from: OpelJay on 02 May 2013, 00:06:04
Quote from: zirk on 01 May 2013, 21:49:56
Just to add, if it is a VX from factory Duel Fuel, it will have a red / black button right side of gear change and the LPG Fuel Guage shares the same as the standard Petrol one.

Yer that's the one just as you described, I got told the other day I need new manifold gaskit but wouldn't of thought that would effect it should be ok.
air leak would raise revs especially on gas :y
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OpelJay

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Re: LPG Revs high?
« Reply #8 on: 02 May 2013, 14:09:22 »
Quote from: symes on 02 May 2013, 13:21:23
Quote from: OpelJay on 02 May 2013, 00:06:04
Quote from: zirk on 01 May 2013, 21:49:56
Just to add, if it is a VX from factory Duel Fuel, it will have a red / black button right side of gear change and the LPG Fuel Guage shares the same as the standard Petrol one.

Yer that's the one just as you described, I got told the other day I need new manifold gaskit but wouldn't of thought that would effect it should be ok.
air leak would raise revs especially on gas :y

So if I have an air leak why does it work ok on the fuel?
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symes

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Re: LPG Revs high?
« Reply #9 on: 02 May 2013, 14:19:49 »
because it detects more air and put in more gas=higher revs
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OpelJay

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Re: LPG Revs high?
« Reply #10 on: 02 May 2013, 16:28:18 »
Quote from: symes on 02 May 2013, 14:19:49
because it detects more air and put in more gas=higher revs

Call me dumb but I don't really know what you mean. I've sprayed carb cleaner all around engine bay and looked for loose or pipes that are off and nouthing so I can't quite see how it's an air leak and even if there was it would behave the same on petrol as it does on gas and it's fine on the petrol.
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sassanach

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Re: LPG Revs high?
« Reply #11 on: 02 May 2013, 17:40:15 »
Quote from: OpelJay on 02 May 2013, 16:28:18
Quote from: symes on 02 May 2013, 14:19:49
because it detects more air and put in more gas=higher revs

Call me dumb but I don't really know what you mean. I've sprayed carb cleaner all around engine bay and looked for loose or pipes that are off and nouthing so I can't quite see how it's an air leak and even if there was it would behave the same on petrol as it does on gas and it's fine on the petrol.
i must be dumb too,as a air leak would affect both lpg and petrol as far as i'm aware ???
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symes

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Re: LPG Revs high?
« Reply #12 on: 02 May 2013, 17:48:46 »
on my mig I had a split in a vacuum pipe to vapouriser and when it went on gas it revs went up-but mine is zavolli-and a local lpg specialist sorted it for me-so only know what he told me-dont know if winding me up or not-as what I know about lpg is the square root of f*** all -
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zirk

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Re: LPG Revs high?
« Reply #13 on: 02 May 2013, 17:56:08 »
Quote from: OpelJay on 02 May 2013, 00:03:59
Quote from: zirk on 01 May 2013, 21:20:58
Air leak somewhere on the inlet side, is it a VX badged Duel Fuel on the back, Koltek from memory, lots of issues with them.

No air leak it has been checked - again no problem on petrol

I wouldn't rule out an air leak just because it runs fine on petrol, Petrol Injected engines can be quiet forgiving when it come to leaks, not always the case with LPG.
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sassanach

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Re: LPG Revs high?
« Reply #14 on: 02 May 2013, 17:58:41 »
Quote from: symes on 02 May 2013, 17:48:46
on my mig I had a split in a vacuum pipe to vapouriser and when it went on gas it revs went up-but mine is zavolli-and a local lpg specialist sorted it for me-so only know what he told me-dont know if winding me up or not-as what I know about lpg is the square root of f*** all -
now that makes more sense :y
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