Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: stuvaux on 29 April 2007, 23:01:50
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does anyone on here know about lpg systems?
I have 2 problems:
1. During changeover to gas, the car now pauses considerably. It used to only feel like an auto `box change. It now seems to hold back for a couple of seconds as it changes fuels.
2. The lpg guage no longer works. Is there an eay way to free off the `sensor` at all? It shows full all the time, as if it is stuck.
The system is a multipoint zavoli if that helps.....
Thanks in advance...
Stu
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we have a few experts on lpg....ideally you need Martin Imber or Jamesv6cdx to be online......or Marks DTM...
Sure we can get you an answer in the am :y
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ok thanks mate...
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re. the hesitation when moving over to gas...
When did you last change the Gas filter?
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gas filter was last changed about 10 months ago (8000 miles)
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The only thing I know about LPG is that the tosser who fitted to my current project should be skinned alive and baked in the sun for a month until he is sorry! Dangerous, badly fitted, wrongly plumbed, badly wired, madly routed, upside down, inside out and a complete and utter shambles.
After I have re-designed the whole thing and put it back together it should be a damned nice system.
Oh, and gas goes in a big tank thing.
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SOunds like low pressure by the injectors, if not filter, could it be a dented pipe?
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Sounds like what i had with mine and it got worse and worse to the point of not flicking over the light turned green but it would die.
I tracked it to the middle solenoid valve with the filter in it on mine the valve was not opening correctly in the end it was not opening at all.
The LPG gauge's are rubbish I normally just go on mileage and ignore the gauge.
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we have a few experts on lpg....ideally you need Martin Imber or Jamesv6cdx to be online......or Marks DTM...
Sure we can get you an answer in the am :y
Hey what about me... :'(
Anyhow, the first thing I would check is for any damage to the fuel line from the rear of the car up to the front, as already mentioned! The fuel pipe should (as LPGA specify) run underneath the floor on the (driver’s side on mine) You might find that the pipe will follow the existing fuel pipes and should surface inside the drivers front wing, so check for any damage here. Check for loose connections into the evaporator/gas regulator/injectors. Secondly I would have though (as already mentioned) a solenoid may have failed?? What are the voltages at the solenoids? I hear a loud click from the tank solenoid when warmed up and then another click on the pressure reducer solenoid when dropping past 1750 rpm. 2 click and i'm cooking on gas!! :y
I recall that I was advised by an LPGA that if problems like this do occur and are not resolved by the above... then maybe the fuel pickup mechanism in the tank in clogged. Then the only way to resolve this is to strip and clean out tank.
How old is the installation?
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Check all the wiring at the tank end - could be a broken join for the gauge
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SOunds like low pressure by the injectors, if not filter, could it be a dented pipe?
Dont think it will be filter or low pressure....as surely it will be hesitant when flooring it.....ie..get the revs up high...and go for it....if it does then i dont think low pressure will cause the prob
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It sounds a bit like mine.....misses badly when first changing to lpg on low revs.....rev it and its ok....im suspecting the coil pack on mine not giving a good enough spark or dis pack in your case
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It sounds a bit like mine.....misses badly when first changing to lpg on low revs.....rev it and its ok....im suspecting the coil pack on mine not giving a good enough spark or dis pack in your case
Been there, done that! I had this problem at 150k and was fixed with a £30 set of HT leads from Halfrauds. Think your HT setup is different on a 2.2 though...???
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sorry about not replying any earlier - i've been out all day.....
thanks for all of your suggestions
i will check the gas pipes are not damaged in any way, as the car was involved in an accident (not my fault!)
I think it may be the brass connector that is located after the filter, just before it gets to the injectors.
It has two wires running to it which came off, and i tried to solder back on - but maybe i have done it wrong.
what exactly does this connector do? (if anyone can follow what i mean without seeing it!)
thanks
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sorry about not replying any earlier - i've been out all day.....
thanks for all of your suggestions
i will check the gas pipes are not damaged in any way, as the car was involved in an accident (not my fault!)
I think it may be the brass connector that is located after the filter, just before it gets to the injectors.
It has two wires running to it which came off, and i tried to solder back on - but maybe i have done it wrong.
what exactly does this connector do? (if anyone can follow what i mean without seeing it!)
thanks
Gas pressure
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It's a pressure reducer which is the final stage before the gas hits the injectors. There should (if like mine) be a solenoid built into the reducer and if 12v is applied to the solenoid it'll switch the gas on, but if the 12v is dropped - ie: ignition switched off, then the gas supply is stopped. There is also a solenoid on the tank too. Both of these make LPG much safer in the event of an accident!
Hey has anyone got a good LPG diagram at all? it's be good to refer back to a diagram for this! I don't have one to hand as it's all in my head and i can't be arsed firing up Visio...
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It sounds a bit like mine.....misses badly when first changing to lpg on low revs.....rev it and its ok....im suspecting the coil pack on mine not giving a good enough spark or dis pack in your case
Been there, done that! I had this problem at 150k and was fixed with a £30 set of HT leads from Halfrauds. Think your HT setup is different on a 2.2 though...???
Yep no leads on mine......so carnt be that.
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so does that mean its not likely to be that then? (the pressure solenoid)
I also forgot to mention that it only happens when cold (or left for a minimum of about 4 hrs)
Once warmed up the changeover to gas is smooth. It seems as if it is maybe changing over to gas a bit too soon when the engine is started from cold.
thanks, stu
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I also have another quick question regarding the lpg system
Are the matrix pipes the best way to feed hot water to the vaporizer?
When first fitted, it was fine while the heaters were on hot, but come summer, with heaters on cold, this was cutting off the hot water supply
The vacuum on the HBV had to be blocked off to solve this - does this cause any problems, or is it the best solution?
Thanks
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There is a doctored photo somewhere with the best connections on, if it doesn't reappear I'll post tonight
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I also have another quick question regarding the lpg system
Are the matrix pipes the best way to feed hot water to the vaporizer?
When first fitted, it was fine while the heaters were on hot, but come summer, with heaters on cold, this was cutting off the hot water supply
The vacuum on the HBV had to be blocked off to solve this - does this cause any problems, or is it the best solution?
Thanks
It's been incorrectly plumbed. The HBV has one inlet and two outlets -- one to the matrix and another bypasses it and goes straight back to the block. So yours is obviously plumbed into the pipe that goes to the matrix, which is cut off by the HBV when the heater is off. The correct pipe to plumb into is the inlet going into the HBV, as this will always have a flow of hot water regardless of the position of the HBV.
The picture Martin is going to post will show where to connect it to, it will become clear then. Should be an easy fix, albeit a bit of a pain for accessibility.
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Thanks for your help
If you can post the pics, then that would be great....thanks
So what is the most likely cause of the sluggish changeover in your opinions?
Also, is it possible to get the guage working again?
thanks,
Stu