Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Bob G on 16 October 2012, 14:01:54
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Noticed that when running LPG it will run fine for varying periods of time and at all speeds, then with no warning it displays symptoms of missfiring, and runs almost like and engine running on governors, switch back to petrol and all is well, later back to LPG and again runs sweet then the same symptons kick in
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What engine? Whats the type of LPG install is it?
Can you read any codes?
LPG does require a stronger spark, when were the plugs last changed?
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LPG filter been changed recently/ever?
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Sounds to me like the vapouriser might not be getting enough coolant flow. How has it been plumbed in? Do you have any photos of the installation you could post?
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wow lots of ideas, will check manufacturer, take phots, James (gloucester) put new plugs in last month, it is a 2.0L GLS, now hangs head in shame where is LPG filter, I have had car just over a year and I have never changed it. Is it phots of engine bay or bay and boot that are needed?
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emer is the make and hope the images are of help
(http://i111.photobucket.com/albums/n128/chieftain900/008-1.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/006-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/005-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/004-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/003-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/002-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/001-2.jpg)
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Hmm. Can't see the Vapouriser yet.
Follow that thick black pipe that goes from the 4 way manifold, past the oil filler cap and it'll eventually go to the vapouriser (might be a filter in line first). Then you should find 3 thick coolant lines going into the vapouriser. The routing of those would be good to know.
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Kev
thanks is the pipe the one that can just be een running past the oil filler cap, hate to be so vague but LPG is all new to me. Will look at that tommorow in the daylight
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Kev
Hope these are of more use, I have the big pipe you mentioned going in then coming out I have two pipes, one splits in a Y with one going to manifold, the other the left as indicated on the box on scuttle, the other larger pipe then joins a T connection that is leading back inot the header tank, only other connection is a copper pipe. I would also add that sometimes this has cut out totally and usually at the most awkward moments.
(http://i111.photobucket.com/albums/n128/chieftain900/005-3.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/004-3.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/003-3.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/002-3.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/001-3.jpg)
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Also check gas valve as this has a short pipe going into the vaporizer and another coming out of the vaporizer to the filter, a loose connection on valve or faulty valve switching on and off, your system looks if it has only 1 gas valve which would normally be under the bonnet close to the vaporizer, did not see vaporizer in picture hope this helps
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I cant seem to find a filter though
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I can't see a filter either, it should look like this:
(http://thumbs3.ebaystatic.com/d/l225/m/mPluUSLckagcgTl_x5ZWZVA.jpg)
Try following the feed from the tank into the engine bay :y
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Tunnie thanks for image
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Hopefully better shots showing vapouriser, couple of things I noticed this time, as part of the bundle of cables is the one with a blanking cap and the other is the 2 core cable that looks as if it has been cut coming from the ECU (LPG) as in picture, the only location I could find on the other end of the loom was the 2 shown that have crimps on them. Would a faulty or not performing 100% thermostat affect operation of LPG?
(http://i111.photobucket.com/albums/n128/chieftain900/009-1.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/008-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/007-2.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/006-3.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/005-4.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/004-4.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/003-4.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/002-4.jpg)
(http://i111.photobucket.com/albums/n128/chieftain900/001-4.jpg)
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This is my install on the 2.2:
(https://dl.dropbox.com/u/803897/Omega/LPG/Day2and3/DSC00675.JPG)
The filter is here:
(https://dl.dropbox.com/u/803897/Omega/LPG/Extra/DSC00738.JPG)
On your install, this looks like the vaporiser to me, the 2 fat pipes should be coolant flow, the smaller lower pipe should be LPG vapour, follow that, it should go through a filter. Unless it goes off straight to the injectors? :-\
(http://i111.photobucket.com/albums/n128/chieftain900/004-4.jpg)
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what an incredibly neat set up on that pic of yours, def no filter in that location but will follow pipes tommorow
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went and looked and I have the following, the small pipe comes out and joins a Y connection on pipe goes to the small black box with the screwdriver red handle marked on it the other pipe from that box goes to the injector block, the other pipe from the Y goes to the manifold ?
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You posted a Thermostat question in another thread, faulty thermostat could also cause an issue on LPG. :y
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You posted a Thermostat question in another thread, faulty thermostat could also cause an issue on LPG. :y
Absolutely, especially if the coolant temperature is dropping below the "switch over" temperature. :y
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Thanks guys, I raised it in this thread today as it occured to me I have one of those temp gauges that is more like an altimeter than a temp gauge. Any thought about the latest pics though?
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what an incredibly neat set up on that pic of yours, def no filter in that location but will follow pipes tommorow
Thanks to Lazydocker for that, apart from the injectors you would hardly know LPG is there.
Apart from the 90L tank in the boot that is ::)
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New stat is £57.72 but refused to tell me the part number :-[
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So if coolant gauge is up and down should 1st step be changing that?
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Right for the last day and 1/2 been running on LPG with no issues, auto changeover to LPG seems to work, and acceleration is there. Wonder if all the twisting and tugging of badly installed pipes and cables did something. On parking up I felt evap and it was cool but pipes warm, is that correct?
Part number for thermostat taken from housing is GM 90501081 2503185
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Looks like gas valve is next to vaporizer, vaporizer should be the same temp as the engine the water from engine to heater( normally the heater valve it self ) there should be a tee piece one pipe to heater valve the other to vaporizer, also the same with the return pipe from heater: if running engine for a short time vaporizer should get warm on a short run should be quite hot running on gas or not, nice cluster of wires and pipes ;D hope this helps :y
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So if coolant gauge is up and down should 1st step be changing that?
I would change the stat before going too mad, the Vaporizer needs a good source of constant hot water for the LPG to run good, sounds to me like the moment cold flowing air is hitting the radiator cooling the water temperature then the Vaporizer is struggling to do its job.
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Yes 1st step is going to be replace the stat then will give an update.
Also can any one tell me what the small black box on page 1 with the red screwdriver handle is for in the LPG set up? the right pipe as you look at it comes from the injector block and the left one goes to the Y connection from the vapouriser. Inside is a small circuit board.
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Yes 1st step is going to be replace the stat then will give an update.
Also can any one tell me what the small black box on page 1 with the red screwdriver handle is for in the LPG set up? the right pipe as you look at it comes from the injector block and the left one goes to the Y connection from the vapouriser. Inside is a small circuit board.
Gas preasure sensor :-\
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LOL the smiley seems to be saying not sure :)
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Bob, feel free to pop it over on Saturday... bring the stat with you...
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James thanks, any particular time, I finish at 1300, but need to be back at around 1550
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James thanks, any particular time, I finish at 1300, but need to be back at around 1550
If it's just the stat we're doing, then you could come straight over at 1300... won't take long at all on a 4 pot...
I'll also try and dig out my romano software, so we can see what your LPG is doing :y