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1

Omega General Help / Re: LPG Problem, misfire under load

« on: 26 June 2009, 21:01:53 »

Pressure needs a physical adjustment... Probably a large allen key in the centre of the vaporiser

i realise this was physical had already spotted the vaporiser adjustment at that point,  i was referring to the operation at high rpm & at minimum values, couldnt change those ones

2

Omega General Help / Re: LPG Problem, misfire under load

« on: 26 June 2009, 20:59:58 »

cheers, ive ordered some silver core plugs specifically for lpg cars as a lot of what i could find on the net suggests it will help, failing that i have a set of stock plugs to try as well.

Fortunately on my install the vaporiser is sat right where you can see it so i tweeked the pressure up slightly, now running at just over 1bar with still no difference to the misfiring

If the plugs make no difference, whats the best thing to try next?

3

Omega General Help / Re: LPG Problem, misfire under load

« on: 25 June 2009, 22:03:51 »

Well ive changed the filter & given all the pipes a good squirt with carb cleaner inside incase of any oil residue, yet the problems are exactly the same as before

Ive been doing more research and im not sure the platinum/iridium plugs are the most suitable & could still be the cause of the problem, can anyone else with lpg tell me what type of plugs they have been using?

Other than that im now out of ideas, anyone else with anymore suggestions?

4

Omega General Help / Re: LPG Problem, misfire under load

« on: 25 June 2009, 10:10:28 »

I shall turn the pressure up slightly then as it did sound a little low.

Any ideas on how to change the values? i altered them in the software, but when revisiting it they didnt save to the ecu, do i need the dongle to be able to change these?

Other values in the software were able to be changed and saved when i did, and yes before i touched anything first thing i did was take a copy of the current setup & save it.

5

Omega General Help / Re: LPG Problem, misfire under load

« on: 25 June 2009, 09:29:59 »

well i didnt get chance to fit my filter last night as it was to dark by the time i got home, however i did break out the laptop to check some figures via the diagnostics

most of it looked ok from what i could see however 2 things were bothering me.

the gas pressure seems to hover around 0.8>0.9 bar, yet ive seen text on the internet that says it should be more like 1.8>2.2bar is this correct?

Also there was a setting for operation at low gas & high rpm
both were set incorrectly in my opinion but i couldnt change them.

operation at low gas was set to continue on gas rather than switch back to petrol, and high rpm was set to cut back to petrol at 2.5k>9k rpm - but i can still hear the gas injectors running over 2.5k if i rev it whilst stationary?

any thoughts anyone? the new filter will be going on when i get home so that at least takes that out the picture.

6

Omega General Help / Re: LPG Problem, misfire under load

« on: 24 June 2009, 12:29:54 »

at last!

my filter & ecu cable has arrived today, as its nice ill be off out on the motorbike this evening, but before that ill get the new filter on and give the rest a cleanout with some carb cleaner, fingers crossed!

7

Omega General Help / Re: LPG Problem, misfire under load

« on: 20 June 2009, 22:30:24 »

forgot to place this in my last post, if your on msn feel free to add me on to your list, comp9801491@hotmail.com

always happy to chat to fellow omega owners, especially if i can pick their brains!

8

Omega General Help / Re: LPG Problem, misfire under load

« on: 20 June 2009, 22:23:24 »

Good to know thanks 

Ive been looking at cables from various suppliers & im a little unsure between the 2 types that are available.

seems to be a cable with a serial plug, some sort of interface box, then the ecu connection

or a usb>serial>ecu cable without an interface box, im presuming both are suitable and the interface is just required for the serial cable?

Id rather make sure before i splash out £40

Having a modern laptop im exactly 1 serial port short of... well having a serial port    so it would be useful to just be able to get the usb one

9

Omega General Help / Re: LPG Problem, misfire under load

« on: 20 June 2009, 19:33:55 »

The car does run fine on petrol, im not quite sure just yet of what the software will allow me to do just yet as ive only today started having a look at it.

It does seem to have live diagnostic readouts so once my cable arrives i shall see what i can find out

10

Omega General Help / Re: LPG Problem, misfire under load

« on: 20 June 2009, 17:30:44 »

thanks for all the replies

ive been going through the history i have with the car and cant find anything regarding when the lpg was last serviced, its been fitted approximatly 2 years, so id be willing to bet never!

Ive found a copy of the ecu software as suggested i just need a cable use with it, ive updated my profile im from preston up north 

would it be worthwhile getting a reconditioning kit for the vaporiser whilst replacing the filter? or do they last longer before needing maintenance?

first things ill replace the inline filter & aquire myself an ecu cable (unless anyone has a suitable one they can loan me whilst i diagnose for some beer tokens?) and see how i go from there.

I have noticed in the ecu software many options are changable, but others are not without a dongle, fingers crossed i dont need one as ive come across software before that wanted one - and it was a real pain!

cheers for the help so far chaps

11

Omega General Help / LPG Problem, misfire under load

« on: 19 June 2009, 08:03:49 »

Hi Chaps,

I have an Omega V6 fitted with a bigas LPG system, ive only had the car a week or so but it appears that it had a problem on the gas system.

at idle it was a little lumpy but bearable, and normal driving it appeared generally ok but with the odd misfire, however at 50mph+ when trying to accelerate it would misfire quite badly and only by changing down could you speed up.

I did some research and it appears any weakness in the ignition side could be causing my issues, so i have replaced the DIS pack, HT leads and sparkplugs with high quality items (plugs are platinum and are gapped to .7mm) i did find a poor connection on the DIS pack that would definatly cause a weak spark in 1 cylinder and so i thought the problem would be cured, however the problem remains, where should i look next as to the cause of the problems?

Regulator? filters? all the injectors appear to be working correctly, i have had an LPG car previously but never encountered any issues with it so dont have much experience testing/repairing gas systems.

any advice is much appreciated!
Craig

12

Omega General Help / Re: Intermittent misfire - 2.6 help please

« on: 20 June 2009, 23:13:45 »

are the 2.6 & 3.2 individual coils on the plugs?

13

Omega General Help / Re: Intermittent misfire - 2.6 help please

« on: 20 June 2009, 22:55:31 »

I would say definatly check all the ignition side out, plugs & ht leads first, if they are all clean and ok it could be the dispack i recently replaced mine trying to sort problems with my lpg system, and i found several bad connections on the dispack (that lead to the contacts corroding and so becoming even worse) we would never have discovered otherwise.

A common ignition problem on the v6 omegas is where the rocker box leaks oil and so the plug holes fill up causing a poor spark and degrading the ht leads.

14

Car Parts, bits For Sale & Wanted / Re: Breaking facelift Omega Elite 3.2 Estate

« on: 20 June 2009, 22:39:40 »

hi is the NCDC 2013 with half screen still available? if so would you take £50 + p&p?

Thanks