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[Andi_Loughborough]

Hi All,

First post on here, so hi everyone.

Ok, niceties over and done with, I wonder if anyone could help please?

I have (for my sins) an old (N reg) 8v 2.0 petrol Omega, manual, 188,000 miles on the clock with LPG conversion on it. I bought it with the conversion and had it serviced, lpg service, new timing belt, water pump, tyres (bloody thing has cost me a fortune).

Not a bad car, but the EMS light is on all the time and I have had it checked with the paperclip test and also a Tech-2, both of which show that the fault is in the "Fuel vent valve".

Question - where the hell is it? I had heard it was accessible from the inspection plate in the boot, so have (just) duly taken out LPG gas tank (carfully I might add) as it was totally obscuring the inspection plate. All I find is a plug that feeds into the petrol tank and I am guessing that this is the reader for the fuel guage. Anyway, gave it a blast with WD-40 just in case.

Have checked all over and found that a couple of references point to somewhere under the bonnet - also a possible fuse fault or feed problem. I am tearing my hair out as it is coming up to MOT time and it will fail with the EMS light on. Yes, I know I can take the bulb out, but that only hides the fault, it doesn't fix it.

If anyone can help, I would appreciate it.  meantime, I have a car in pieces ith the LPG gas tank kind of hanging out the boot - not a good look!

Cheers


Andi

[Auto Addict]

Welcome to the forum

Can't help I'm afraid, but there are a few on here with LPG, thtat should be able to help.

[old cruiser]

Not 100% sure , but the vent valve maybe part of the carbon canister and these are located  in the off-side( driver's side) wheel housing, you will have to remove the wheel arch liner to get at it, when you do get to I think there are 2 x pipe connections and the upper of the two on the canister is the vent valve line, so if not integral with canister then trace upper pipe back to what hopefully will turn out to be the Vent valve, I hope this helps somewhat!
Cheers Pete

[rpont]

The pipe comes back into the engine area. Look for a stiff black plastic pipe, a bit thicker than the vacuum ones, coming in from the drivers side wheel area and follow it to the valve. I don't know where the valve is on the 2l but one pipe will be the one described and it will have another going to the intake side of the engine, probably after the butterfly.

[Andi_Loughborough]

Hi all,

Sorry not had chance to get under the bonnet yet - bloomin' work has gone mad!

Anyway intend to take a look at the weekend - should get some time then.

Also, just invested in a Haynes manual - absolutely no reference to it in their, however the Tech-2 is adamant there is a problem with it!

Love Vauxhall - they always hide these innocuous little bits then tell you they are faulty!

Will keep you updated with the score on this one - espcially if I can find it...

Cheers

[gofwb]

Andi,

Dont worry about the MOT it wont fail with the EML light on, my old Omega had a fault that no one could cure (probably a wiring fault), it went through 2 mot's and both times i got an advisory note just stating the light was on.

Regards

Frank.

[smoothomega]

Hi Andi and welcome to the forum, its good to have another Loughborough man in here. I'm sorry i cant help with your problem but feel confident that someone will shed some light on it, you have come to the right place Good luck, Jez

[rpont]

Also, just invested in a Haynes manual - absolutely no reference to it in their, however the Tech-2 is adamant there is a problem with it!

Look at page 4B-2 and 3, it's the purge valve. As you will see there are two 2l engines used and it might help to know which one you have for some problems. I don't know either of them personally but it can help to get your questions answered quicker. You can put that information in your profile and it comes up next to your posts.

[Admin]

Ahh the old 2.0 8v lump out of the Carlton!

Great old thing, tough as they get but a bit lacking in power to heave an Omega around.

It is as rpont has said, probably a blockage.

It won't fail the MOT on the light, at worst it will get an advisory.

Oh and welcome to the forum.

[Andi_Loughborough]

Hi all,

sorry, have been so damned busy with work, not had two minutes to myself!

Thanks for all the comments and ideas - will be looking into it a bit further today. I have found what looks like either a relay or a small solenoid on the side of the camshaft housing that is hidden under a plastic wiring housing. As you look at the car, it is to the left and very well hidden, it has what looks like a couple of pipes going in and a wiring connector underneath - you know, in one of those "you can see it but damned if you can get to it" positions that Vauxhall loving dealing us with!

Had a look in the Haynes manual as requested and am scratching my head about which one it is - I think it is very similar to the Carlton engine (my last car!) - and I agree it could do with a bit more power. It has so many problems, compounded by the fact that the garage I had service it seemed to make matters worse!

It has a tendancy of trying to drive as if "the choke is on" on petrol when it is warm / hot - it coughs, splutters, and generally gets the arse. After 15-20 mins of driving the power comes back and it starts idling evenly. It is strange - never seen this fault before and pretty much always had Vauxhalls.  Only does that on petrol by the way - gas is perfect!

Will update you as I find out more bits

By the way hello fellow Loughboroughian!

Cheers


Andi

[Andi_Loughborough]

Rpont,

Just re-read your message and now understand what you mean. The purge valve is the twiddly bit sat on the camshaft side. Is this the same as a fuel tank vent valve? I can find no reference to the vent valve in either Haynes or on the net. Very helpful as my car is adamant the vent valve is knackered!

Cheers

Andi

[Marks DTM Calib]

The fuel tank vent valve is indeed the carbon canister purge valve........the ECU can detect little more than if the valve is open or closed circuit...

If you remove the cable tray that runs along the left side of the cam cover housing, you will see it below with a couple of vac pipes and a single 2 pin electrical connector....

Do you now what codes were stored.

[Andi_Loughborough]

I stripped down the purge valve yesterday, underneath the cable strip, cleaned it out with carb cleaner and WD40, checked that the pipes were all clean and that the connector pipe at the bottom of the plenum chamber was clean. refiited and still had the same problem. Even stopped and restarted the engine 35 times (35 clean starts) and also d/c the battery for 2 hours. Guess what? No change!

Anyone know where I can buy, beg, borrow or steal a spare vent valve to see if the problem is that or in the wiring?

The only reference that I have got is that the fuel tank vent valve is showing a fault, don't know if it is open or close circuit.

Am away for a few days now (Glasgow) probably won't be back til Saturday.

Cheers

Andi