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LPG, CNG & LNG - General Info and Issues Share experiences and problems |
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LPG tune upViews : 1772 Replies : 11Users Viewing This Thread : |
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Jun 20th, 2013, 22:28 | #1 |
Volvo 960
Last Online: Today 00:44
Join Date: Mar 2008
Location: Planet Earth
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LPG tune up
Hi chaps, i'm sure my lpg system must need a tune up as I was getting 21/22mpg when I first got then system about 2.5k ago, but now it seems like i'm getting 18mpg... Does it mean I need a so called 'tune up'?
I see people saying that after a tune up their system runs better and they get better mpg etc, but i'm confused - what exactly is a tune up and why is it needed? How does it get out of calibration in the first place?! My lpg installer is a bit to far to be going to for 'tune ups'...Half wondering if I can get the software and plug myself and have a crack unless its quite complicated! EDIT: Just seen this: http://www.ebay.co.uk/itm/King-AEB-L...-/360479608664 I've got a King ECU, wonder if that cable/software would be useful, seems a bit dear for a cable and some software though...More research needed Last edited by yoda960; Jun 20th, 2013 at 22:38. |
Jun 21st, 2013, 06:21 | #2 |
VOC Member
Last Online: Apr 20th, 2024 18:56
Join Date: Jun 2006
Location: Selby, North Yorkshire
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Not sure what is meant by 'tune-up' either, unless you're planning to 're-map' or 'chip' the fuel system. In the old days it meant fiddling around with carburettors and mixtures, chokes and needles. These days, cars have pretty much sealed-for-life electronics, and tuning for more oomph means playing with the engine control software. This is OK, but can have all sorts of implications if you don't really know what you're doing.
I'd forget all that stuff to be honest and go with the basics: New spark plugs (copper core single point), air filter, clean up the rotor and dissy cap if fitted, etc. Is the temp gauge sitting at 3 o'clock? If not then a new thermostat is needed. LPG needs to have tip-top electrics and optimum temperature otherwise it won't work properly - oh and use the air-con with care. Air conditioning can clobber fuel consumption. Cheers Jack Last edited by capt jack; Jun 21st, 2013 at 06:27. |
Jul 8th, 2013, 00:25 | #3 |
Classic P80 1999 BiFuel
Last Online: Mar 6th, 2024 00:34
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Location: 48mph Middle Lane M4
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An aside, but this amused me.
I know the guv'nor of the local cycle shop. He does a roarign trade in tune-ups, and when I asked him what he meant by a 'tune-up' (on a bike FFS) he smiled and repleied with a wry grin, "I really don't know, but my customers seem to". He admitted along with simple punctures half his workshop staff were employed doing these. I had to agree with him, he used to offer a specoifed service, but tune-ups are far more lucrative.
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Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."] |
Jul 8th, 2013, 16:09 | #4 |
Volvo 960
Last Online: Today 00:44
Join Date: Mar 2008
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I agree, the term tune up doesn't make sense but I have seen posts whereby people have said they have had their lpg system fettled and tuned and now they run better/more economically, i'm just confused as to how that can be! Its has a service inc plugs, filters etc just before the lpg was installed so very recent, dissy cap etc clean. I might check the dissy cap again just to make sure no oil is leaking into it. I know a seal has blown somewhere as its leaking oil
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Jul 8th, 2013, 17:40 | #5 |
Trader Volvo in my veins
Last Online: Yesterday 23:53
Join Date: Dec 2004
Location: Anglesey
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Try resetting the petrol ECU and see how that effects it
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Jul 8th, 2013, 21:29 | #6 |
Volvo 960
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Hi Dai, how do I go about doing that? Unplug the battery for a few hours?
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Jul 8th, 2013, 23:49 | #7 |
Trader Volvo in my veins
Last Online: Yesterday 23:53
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Location: Anglesey
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Disconnecting the battery will do the trick. Let it run on petrol for a few miles before switching to LPG
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The Following User Says Thank You to classicswede For This Useful Post: |
Jul 9th, 2013, 09:11 | #8 |
Volvo 960
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Ok thanks will give that a go, what does it do though?
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Jul 9th, 2013, 09:46 | #9 |
VOC Member
Last Online: Apr 20th, 2024 18:56
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Location: Selby, North Yorkshire
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As I understand things it works something like this:
When a car is converted to LPG, the original petrol ECU is retained, and the LPG ECU becomes a 'slave' unit to it. The engines sensors (O2 mostly) still send information about the exhaust gases to the petrol ECU. The LPG ECU sends information about fuelling to the petrol ECU, and provided that the petrol ECU can make sense of these two inputs, all will be well and the car will run happily on both. However, if the LPG system fails to run properly for whatever reason, the O2 sensor will detect this and tell the petrol ECU. The petrol ECU will then try to make adjustments to the petrol fuel map. But of course it can't alter the LPG fuel map and continues to get information that the fuelling is wrong, and so tries to adjust some more. In other words, it tries to compensate for a perceived 'fault' in the LPG system by adjusting the petrol, and in effect gets it's little silicone-chip knickers in twist. By disconnecting the car battery for a while and then running on petrol, the petrol ECU resets itself to it's correct petrol settings. Then by switching to LPG, provided that whatever caused the LPG system to run badly has been addressed, the petrol ECU and the LPG ECU should be communicating happily again. If the same symptoms start to occur then the LPG ECU will need attention. However, before anyone starts to connect up their LPG re-mapping laptop, it makes sense to ensure that the basics are sorted - plugs, leads, dissy cap, rotor, LPG filter etc. Then if any further intervention is needed, you know that you've eliminated all the things that might be affecting the way that the LPG is burning. If the system is a new installation then this is probably just a part of what you can view as a 'settling in ' period. It's very likely that you will need to take the car back to the installer so that he can re-adjust things. Finally, you say the car has had new plugs. What type are they? Anything other than simple single-point copper-cored plugs is going to give you problems as LPG does not like fancy multi-pronged non-copper spark plugs. Hope that helps! Jack Last edited by capt jack; Jul 9th, 2013 at 09:49. |
Jul 9th, 2013, 19:42 | #10 |
Volvo 960
Last Online: Today 00:44
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Hi Jack, thanks for the detailed reply, great info there
I've got bogstandard ngk plugs that were recommended by Dai so they should be fine, not that old either so should be fine, will see how I get on with the unplugging battery |
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