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sluggish on LPG

 
 
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Martin Watt
Banned!


Joined: 14 Aug 2005
Odometer: 1321
Location: Ellon Aberdeenshire



PostPosted: Tue Mar 03, 2009 7:58 am    Post subject: sluggish on LPG Reply with quote

My disco 1 (300) 3.9V8 is having an issue when on petrol she runs great but a bit of a pain when first started meaning the revs jump around a we bit then some times drop off and stall out the engine.
On Gas it seems to loose power at higher speeds above 40 but 20 to 30 not to bad. you can put your foot down watch the revs go up but no increase in speed .
One thing I have noticed is the cat on the drivers side of the motor is rattling and a bit clunky so I am wondering if the cat is causing a bit of back pressure to the engine and on gas it is having problems but on petrol it has the power to over come the cat issue.
when you turn from gas to petrol its like you hit a boost button

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Just got a Vitara all hail the dark side
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Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Tue Mar 03, 2009 12:16 pm    Post subject: Re: sluggish on LPG Reply with quote

Martin Watt wrote:
One thing I have noticed is the cat on the drivers side of the motor is rattling and a bit clunky so I am wondering if the cat is causing a bit of back pressure to the engine and on gas it is having problems but on petrol it has the power to over come the cat issue.


It certainly won't help. If you have a mixer-type system (you didn't bother telling us) then it does rely on through-flow of air to get correct fuelling. The petrol injection system just dollops in fuel regardless, so its more likely to get some kind of flammable mixture into the cylinders, and more likely to still ignite even when the mixture is wrong.

The gas may be generally out of sorts anyway, who knows the last time you had it serviced or set up (settings do drift, filters need changing) but no point persuing that till you have fixed the known problem and see what's left.

cheers, Ross K

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mogmaner
Winch Assistant


Joined: 26 Feb 2009
Odometer: 91
Location: NOTTINGHAM



PostPosted: Tue Mar 03, 2009 4:42 pm    Post subject: poor runing Reply with quote

You may find that ther is a build up of tar in the vapariser this comes from out of the gas .On forklift i have seen them chocked to the point were the engine will not run above tickover on load ,If striped you should fit new seals and have it checked for leaks.Hope this helps. I run my unimog on lpg with no problems ,if all parts sized corectly petrol can be discarded. THIS IS MY GAS MIXER REPLASING PETROL COMPLETLY.
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webber1982
Just got MTs


Joined: 21 Jan 2007
Odometer: 367
Location: St. Helens



PostPosted: Tue Mar 03, 2009 8:38 pm    Post subject: Reply with quote

really need to know what system it is thats on it if youve had the battery off or its been flat then it can sometimes give you the problem ur havin.
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Martin Watt
Banned!


Joined: 14 Aug 2005
Odometer: 1321
Location: Ellon Aberdeenshire



PostPosted: Wed Mar 04, 2009 8:22 am    Post subject: Reply with quote

It was running great till about a week after the cat started to rattle and clank
I have another cat to fit on Monday.
So I will see what happens after that.

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