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[Danny]

My car has been given a full fresh set of spark plugs as well as its conversion for an extra tenner as my old ones were well shot, but the car's still idling lumpy on gas, is this because its a fresh conversion? i know it's meant to take a bit of time to settle properly

also, not sure i understand the gas level gauge, there is an "R" then the "I II III IIII"

which would be lit when it needs filling again? only the R is lit when i'm driving, and it's meant to have 64 litres in it!

[The Doctor]

Should be as smooth as an Immac'd teenager , and the R is reserve, then I, II, III, IIII is probably 25% 50% 75% and Full.

If its been filled then I suspect a mistake during fitting.

[JamesV6CDX]

Re the gauge lights, It's gonne be config in the software

First thing I'd check is that the fuelling is correct and the injector timings set up properly.

Danny, how have they plubmed in the evaporator to the coolant system, and is the evaporator red hot when the engine is at full temp? This is very important to know...

[Taxi_Driver]

My car has been given a full fresh set of spark plugs as well as its conversion for an extra tenner as my old ones were well shot, but the car's still idling lumpy on gas, is this because its a fresh conversion? i know it's meant to take a bit of time to settle properly

also, not sure i understand the gas level gauge, there is an "R" then the "I II III IIII"

which would be lit when it needs filling again? only the R is lit when i'm driving, and it's meant to have 64 litres in it!

I would take it back tbh......even a fresh conversion should idle smoothly........and the R means reserve......ie empty......so either theres hardly any lpg in it.......or they havent bothered to setup the gauge correctly.......with a full tank you should have 4 greens lit.

Im suprised they didnt bother to take time to explain the gauge to you.

But before you take it back........if the plugs were that bad.....try a new air filter to see if it makes any difference  

[tunnie]

Re the gauge lights, It's gonne be config in the software

First thing I'd check is that the fuelling is correct and the injector timings set up properly.

Danny, how have they plubmed in the evaporator to the coolant system, and is the evaporator red hot when the engine is at full temp? This is very important to know...

Could not agree more, seeing the results you achived on the LPG facelift i had.

Make sure the coolant has a direct feed from the coolant bridge, and not just a T peice below the header tank.

[JamesV6CDX]

That's what I was getting at Mr Tunnie...

I rekon they've probably plumbed the vaporisor in incorrectly and / or not set the multiplier map on the road...

A lead and some software is needed, after the basic hand on evaporator checks..

[JamesV6CDX]

Danny,

No offence is intended here, but I'm not sure what your knowledge of LPG installs is. If you like, you can give me a call, and I can talk you through the basic checks.

If I had paid that much cash for an LPG install that didn't idle right, I would be going nuts!

How does it behave at higher revs, when you give the loud pedal some abuse?

How bad is the idle difference on gas? Is it clearly noticable? Or just extremely slight?

Do you know where they positioned the injectors? This can play a fairly large part in idling so I hear.

If my car's not been used in a while (few days), it will have a really bad LPG idle until its had a good run. But then it's fine..

but 9.99 times out of ten, mine idles perfectly, and it ALWAYS without fail idles perfectly when hot

I'm no "expert" but it doesn't sound like the installers are either if they've let it go like that!

If you want to have a chat, then no problemo...

Am I right in thinking it's an OMVL dream kit?

I would also like to know where they picked up the RPM signal.

From the coloured wire on the DIS is not the best place, as the signal is not clean or consistent. Much better to get it from the relevent ECU pin wire.

Don't stress too much though, it's fixable, and if it runs OK on gas otherwise, it's not indicative of a major fault (but could go that way if the varorisor isn't getting a good coolant feed.

Looks like on a car such as this one, DIY may still be the best option if you know the car...

[JamesV6CDX]

Last question.... what internal Bore size is the gas tank to evaporator pipe? This is very important on larger engines, but affects them more at higher RPM.

If it's going lean at full load, I wouldn't use LPG until it's been confirmed as set up OK, as you're into Piston melting territory there !!

[Danny]

I'm thinking my best bet is to print off this entire page and return to the garage with it tomorrow, cos LPG and engines are way over my head

i'll say this, it idles lumpy, but driving is absolutely fine, but if i lift of the pedal and hold it at 1500rpm the EML comes on, but goes off once i press the pedal harder, car doesnt lose any power

should i run it down the motorway in the morning d'ya think? will that make any difference?

[tunnie]

I'm thinking my best bet is to print off this entire page and return to the garage with it tomorrow, cos LPG and engines are way over my head

i'll say this, it idles lumpy, but driving is absolutely fine, but if i lift of the pedal and hold it at 1500rpm the EML comes on, but goes off once i press the pedal harder, car doesnt lose any power

should i run it down the motorway in the morning d'ya think? will that make any difference?

If the install is done right, there should be no difference on petrol or gas, you should not be able to tell the difference!

Take it back Danny, EML and lumpy idle is not right.

1 very basic check and we can tell if this garage is any good. pop the bonnet and take a look at the coolant header tank!

On the right hand side of it, looking at the car, underneath the tank, there should be a coolant pipe that goes into the left hand side of the engine, into a big silver pipe.

Is there a T-Peice on it?

Also post loads of pictures up so we can take a look, i would take a large bet that people here know more than the garage    

[Kevin Wood]

If the EML is coming on the likelihood is the fuelling on LPG is out and it's causing the fuel trim to go out of range. Sounds like they just need to do a more thorough job of mapping the LPG ECU but check the points James mentions too.

Not surprising I suppose, it took time to get James' mapping right and if you're under pressure to get the job out the door I guess that's where it's going to fall down.  :-/

I'd take it back and ask them to improve it.

Kevin

[Danny]

to confirm for james, it is the OMVL dream 21 system, my apologies for having no knowledge of this stuff, i know its probably not helping you help me much!

PICS: http://www.omegaowners.com/forum/YaBB.pl?num=1205229583

[tunnie]

as per the other thread?

1) its a single point mixer system??
2) Strange place for the evaportor

I can't see where the main coolant feed is

[JamesV6CDX]

Danny, I hate to say this mate, but from what I've seen that's NOT an SGI kit.

And, they have made a real PIGS EAR of fitting it.

It's no wonder it's going to idle badly. If they've used the coolant feed from the throttle bodies it A) Won't get enough coolant and B) Won't get coolant very often! (As it's only a bleed-off back to the header tank!!

that feed can only come from one place - the bridge!

I would be driving it through their window at this stage, having paid what you did....

[Martin_1962]

Just joined this thread, single point, gas feed is a long way from the inlets.

If it was twin feeds by the throttle body - possibly OK.

Water feed is not good, need to get the feed from behind the engine.

My idle is slightly lumpier on gas than petrol but needs A-B to notice it, but is quieter and smoother over idle.

Complain and pay the extra costs (not labour and deduct the cost of the SP system) for SGI.

The long trunking is why SP does not work too well on Omegas