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[JamesV6CDX]

I'm still stuggling with trying to get this astra running quite right on LPG.

It's like an ignition issue - the power comes in "Stages" when going up the revs in first and second - it's not noticable in higher gears.

No codes are being stored.

My gut feeling is it's a ignition issue. That said, I've replaced the plugs and coil pack, and the issue is still there (although not quite so bad).

I visited VX, and spoke with one of their techs. He advised single electrode plugs - which I've tried. No real improvement - however when I closed up the gap on the plugs, it was better.

It's at the stage where the it's quite usable on LPG - day to day driving and motorway cruising it will do all day - but when you try and give it some beans in first or second, it's underpowered, feels like it's towing something very heavy!

I'd welcome any ideas. Although making the plug gap smaller helped a lot, I daren't close it up anymore, else it probably won't run. They're probably too small as it is.

I've noticed that plug no 3 seems to get a bit blacker than the others - even since the new coil pack - however cylinder compressions are all very good.

[markey mark]

is it using any oil james ??
whats the power like on petrol ??
have you changed the ht leads ??
oh and ive sent you a pm mate 

[JamesV6CDX]

is it using any oil james ??
whats the power like on petrol ??
have you changed the ht leads ??
oh and ive sent you a pm mate 

Not using any oil.

Power on petrol is fine - although the issue has also happened on petrol a couple of times.

No HT leads, it's coil per plug, and the coil pack's been changed for a brand new one

PM replied

[markey mark]

with the plug being black i would say overfueling  :-/
what about fuel filter ??

[Lazydocker]

I assume it's a Koltec system?

If so, strange as this sounds, it may be worth giving the LPG distributer a clean out... I'm sure I read something similar on the LPG Forum and that cured it :-/ :-/

[cem_devecioglu]

is it using any oil james ??
whats the power like on petrol ??
have you changed the ht leads ??
oh and ive sent you a pm mate 

Not using any oil.

Power on petrol is fine - although the issue has also happened on petrol a couple of times.

No HT leads, it's coil per plug, and the coil pack's been changed for a brand new one

PM replied

imho,if even in petrol you see this problem first you have to solve that..

did you check coolant temperature sensor ?

how is the water pump condition ?

[JamesV6CDX]

I assume it's a Koltec system?

If so, strange as this sounds, it may be worth giving the LPG distributer a clean out... I'm sure I read something similar on the LPG Forum and that cured it :-/ :-/

Indeed - I had heard the same!

I think Kevin and I are going to put our heads together soon and hook up Tech2, to see what's going on with live data etc.... 

[JamesV6CDX]

Something has crossed my mind.

Firstly, I spoke to a VX Tech, who asked me to try some quad plugs. I put some in, and indeed it ran (certainly idles) better than it ever has.

I put some gas in it (from a different, more frequently used garage) and we did a 100 mile run tonight.

It hasn't really missed a beat, and having just given it some beans around the edge of the city, is pulling very well in all gears, on Gas. Almost comparable to petrol performance.

100 miles later - half of plug 3 is a little dark, as is plug 2, but no signs of serious fouling at all.

When I got the car, it'd been sat for a while.

I filled up with Shell LPG, and she ran OK on gas.

Later topped up with BP LPG, at a rather remote garage. It was after this it went lumpy again.

tonight, after filling at a more popular garage, it ran well...

Just a very strange thought, I wonder if I had a dodgey batch of gas

I'll have to see how this goes - but still intend to look at live data, and such...

[Lazydocker]

Something has crossed my mind.

Firstly, I spoke to a VX Tech, who asked me to try some quad plugs. I put some in, and indeed it ran (certainly idles) better than it ever has.

I put some gas in it (from a different, more frequently used garage) and we did a 100 mile run tonight.

It hasn't really missed a beat, and having just given it some beans around the edge of the city, is pulling very well in all gears, on Gas. Almost comparable to petrol performance.

100 miles later - half of plug 3 is a little dark, as is plug 2, but no signs of serious fouling at all.

When I got the car, it'd been sat for a while.

I filled up with Shell LPG, and she ran OK on gas.

Later topped up with BP LPG, at a rather remote garage. It was after this it went lumpy again.

tonight, after filling at a more popular garage, it ran well...

Just a very strange thought, I wonder if I had a dodgey batch of gas

I'll have to see how this goes - but still intend to look at live data, and such...

Not unheard of, especially if from a source that doesn't shift much

[crazyjoetavola]

Something has crossed my mind.

Firstly, I spoke to a VX Tech, who asked me to try some quad plugs. I put some in, and indeed it ran (certainly idles) better than it ever has.

I put some gas in it (from a different, more frequently used garage) and we did a 100 mile run tonight.

It hasn't really missed a beat, and having just given it some beans around the edge of the city, is pulling very well in all gears, on Gas. Almost comparable to petrol performance.

100 miles later - half of plug 3 is a little dark, as is plug 2, but no signs of serious fouling at all.

When I got the car, it'd been sat for a while.

I filled up with Shell LPG, and she ran OK on gas.

Later topped up with BP LPG, at a rather remote garage. It was after this it went lumpy again.

tonight, after filling at a more popular garage, it ran well...

Just a very strange thought, I wonder if I had a dodgey batch of gas

I'll have to see how this goes - but still intend to look at live data, and such...

Not unheard of, especially if from a source that doesn't shift much

Higher moisture content perhaps? :-/ :-/

[JamesV6CDX]

It's seriously got me wondering

What triggered the thought, is the recollection that I had a dodgey batch of gas from that place on an LPG mig some time ago - exact same symptoms!

I think I'll try the more popular garage, and see what happens!

[Lazydocker]

I try and avoid BP purely because they're normally between 3 and 5ppl more expensive!

[feeutfo]

hmmm, been using bp of late. A fraction cheaper, a bit more convenient, and rarely a queue as its further out of town. But not 24hour, so went to bp services on the m4 tuesday night. They'd run out! On both east and west bound sides..... And burger king was shut! Bast**ds. So had to go to shell, and i thought for a moment yesterday that my top end hic ups where better, although i may have imagined it. Will play today and see....

[feeutfo]

well you know what, i think it runs better. Seriously!
Gave it a good poke down the m4 and the lift of jolt is still there but much easier to avoid by lifting off carefully.
Cant be can it? Maybe i imagined it. Time will tell, this tanks is from shell, last tank from bp. I am under the impression two differant companys supply each. Is this right? Autogas for shell and bp use another name which escapes me . But more likely that individual station surely? I have never seen another car at the bp lpg pump. Not one. It also seems indifferent in how much total gas it thinks your tank will take. Seems to stop the flow early sometimes.