LPG Discussion Forum

Now running sweet thanks to adjustment/remapping by Lpgc.
Thanks Simon.

Hi Simon, the 10th,11th, 12th and 13th are the only days i have off up the xmas I'm afraid.. if you could do it on that Saturday or Sunday would be good and leaving the arrangements to the last moment isn't a problem.
I am off between Xmas and new year if helps.

Hi Simon, my JODB doesn't show fuel system status, it is a import, just been fully through it again.
When on petrol the AF/Alpha does flicker around from 90-106%.

Are my dates any good for you?

Update - after changing all lpg injecters, lower and upper inlet manifold gaskets its now running/idling fine on petrol, running fine on gas but the idling on gas is a bit up and down.

I found A/F AFPHA on my reader and on petrol it's always around 100% on both banks. On gas driving it's around 130 ...

Hi simon, my JOBD reader is very limited, it can't read fuel status or fuel trims, can only see 02 voltage. The 2 after cats sensors are B1 0.12v B2 0.10v.

Thanks

Does it look like i have a air leaking manifold?

Hi Simon, my JOBD reader can read voltage.
Cleaned codes and doesn't return on petrol but does on gas.
On cruise control at 70mph on gas bank 1 02 sensor voltage sets arounr 0.06 - bank 2 0.08v and petrol b1 and b2 0.60 - 0.80 it's idling rough on petrol and gas
Thanks

Bad news its running lean on bank!
Can't work out yet if it's lean on petrol as well.

I have a JOBD reader but can't remember if it reads fuel trims.

LPGC wrote: Mon Nov 01, 2021 5:31 pm You did swap the nozzles at the end of the injectors too (for your old 3mm ones)?

Off course! Thanks

Update- ordered 2 3 bank injecters and did what you said knocked the retaining pins to remove the injectors from the rails, unscrewed the inlet pipes and swapped them along with the nozzles.
Misfire has gone and it's feeling smooth on gas which it hasn't for a good few mths but idle is a bit rough ...

Cheers for info Simon, I've order 2no 3 rail magic jet injecters and do the mod you talked above above. Thanks

Brian_H wrote: Wed Oct 27, 2021 8:55 pm Are these any good?
https://www.lpgshop.co.uk/magic-jet-fx- ... cng-spare/

They list a very similar one at £14.99 but no stock on those currently

That's the ones i have the 14.99 one, just wondering if i can fit the fx model one as a replacement without messing up the settings.

Seems pressure is OK then so it's likely there is a problem with the injector on the misfiring cylinder.

Since the injectors are singular you could just buy one injector but it may be a better idea to buy/fit 6. You could re-use the nozzles you already have. Would be a good idea to check ...

Might be an intermittent fault - sticking injector likely given its worst when cold. Did you ever try injector cleaner? Or swap it for another injector to see if the problem cylinder moves with the injector?


Hi, it misfires hot and cold engine.
No i haven't changed injecters (no one has stock ...

Well I'm confused!
After switching off injecter 6 yesterday and it running fine i thought i would run software and watch vaporiser pressure and when switch off number 6 again but turning turning injecter 6 off make no difference to the misfire! Also tried other injecters and made no difference.
It ...

Just had a look at recorded data a vaporiser pressure stays around 1.20 ish all the time

Hi Simon, i will look at vaporiser pressure and come back to you.
Yes i drilled out injecters to 3m 2 years ago (maybe 3 years) over Christmas time and when bought it up to you for remapping on the 2nd of January.
Sorry i can't call, i work 11.5 days and no phones are allocated.

Thanks

Update- had the software running again today and one by one switched each injector back to petrol/back to gas and I've got a faulty number 6 injector!

So which injectors did you fit Simon?
Do i reed to drill them out?

Thanks

Hi Simon, managed to get software running and recorded data but couldn't see any difference in vaporiser pressure with/without misfire.
A day later the misfire got worse and misfires all the time.

Thanks

Hi Simon, where do i find the gas pressure reads on software?
Map was the only one i could see.

Thanks