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1

Omega General Help / Re: Loss of power and no compression :(

« on: 12 July 2011, 22:13:16 »

No TB, I just looked at the alignment of the cam sprockets. If the cams are clearly out though, what difference will it make? Valve/piston contact has definately taken place.

2

Omega General Help / Re: Loss of power and no compression :(

« on: 12 July 2011, 21:38:12 »

Sorry for the late reply guys. I've been out getting the timing belt cover off tonight and it's not good news, as expected 

The timing has come out and cranking it over by hand it's obvious that there is piston/valve contact. The belt, rollers and tensioner are all intact, however I can only assume that the tensioner is not applying enough force anymore. The timing belt kit was replaced in May 2008 at 81k miles and it has now failed in July 2011 at 117k miles, how pants is that  I can see the marks on the belt teeth where it has slipped over the cam sprockets, but otherwise the belt and teeth look in excellent condition;









Looks like Wots will be breaking for parts 

I could repair it I did a top end rebuild on my ex-plod mv6 when the drivers bank headgasket blew, but I don't have the time and i've already thrown enough money at it so I think it's the end of the road...

3

Omega General Help / Loss of power and no compression :(

« on: 10 July 2011, 20:44:45 »

Well after all the work i've put in it would appear my MV6 has died I had been driving it all day, then this afternoon when pulling away from my friends house it felt very down on power, there was a loud hiss like a burst pipe and the engine died. I thought at first it was a burst lpg pipe so I tried to restart on petrol. When I turned the engine over though it just span making a whirring noise like there was zero compression 

The AA man came out and agreed there seems to be no compression but refused to do a compression test on a V6! I've checked the timing belt and its on and tensioned and no sign of stripped teeth. When the engine turns though it appears there is zero compression  :-? it just whirrs round. I've checked the plugs and they're all in. I'm really confused to be honest but I do think its terminal... I still dont understand what the loud hissing noise/burst was and the brake pedal also went instantly hard and unresponsive.

Any ideas anyone?? As the compression isn't there I can only imagine the belt has slipped. It's not due for its 40k renewal for another 4k miles. It's looking like I may be breaking it if it is terminal...

4

Omega General Help / Re: decat for v6

« on: 01 July 2011, 22:22:50 »

I've now owned 2 de-catted 3.0 MV6's (1 converted by myself and 1 bought already de-catted. I found with both of them the low down torque suffers a lot but the high end power is slightly improved. I believe the torque is lost due to the drop in back pressure. In both instances i've put the cats back on as I couldn't live without the torque and it was too noisy (although it did sound quite throaty). Maybe with a remap the decat pipes could be beneficial.

I still have a pair of decat pipes in the garage if anyone wants to have a go themselves 

*Just to add if you don't have much low down torque your multiram system may not be functioning correctly it would be worth having a look in the How 2 section and checking yours is plumbed in correctly and switchover solenoids are operating 

5

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 21:36:05 »

Is it just me or does that sound like a royal PITA?! 

It does need to be done though I want it running properly. You realise if I do all of this and it doesn't make a blind bit of difference i'll hold you personally responsible   

No I appreciate your help LD and I agree there is a lot pointing to the vaporiser. I've had a look at your setup pictures and it looks very good, it looks like a more professional setup than mine but that probably isn't saying a lot 

6

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 20:19:55 »

Ok thanks LD. Do you have any idea of the cost of that lot? Would something like this be any good?

http://www.ebay.co.uk/itm/LPG-Reducer-Vaporizer-TOMASETTO-ARTIC-power-120HP-240HP-/150620306540?pt=UK_Cars_Parts_Vehicles_Other_Vehicle_Parts_Accessories_ET&hash=item2311ab7c6c

A twin outlet one would probably be best so each bank has a feed. My current one has a single outlet and splits off at the filter.

These extra costs are going to delay my styling plans I think 

7

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 19:08:54 »

As per my email...

The Vaporiser pressure is highly unstable, varying from about 0.7 BAR right up to 4 BAR

Do you get any lag on gearchange? Like it's bogging down?

The Vaporiser diaphragm seems a likely culprit IMO, although I can't be 100% certain, and I'm not convinced that the vap you have fitted is really up to the job either :-/ Has it ever run 100% perfect?

I noticed that when i come off the throttle and the instant mpg goes to 999.9 the vapour pressure shot up - I thought this may be because the fuelling shut off?

No its never run well on lpg but I knew when I bought it that was the case. Yes the gearbox does lag a bit when running on gas it tends to change quite heavily into 2nd gear and it doesn't on petrol. I also get quite a long delay if i'm coasting to a stop and then I put my foot down (such as when i'm approaching a roundabout). I've checked the gearbox oil level and it had a fluid and filter change approx. 10k miles ago and it doesn't behave like that on petrol...

Looks like the vaporiser could be the culprit then? I'm going to have a brand new lpg system soon at this rate!! 

8

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 16:11:12 »

Thanks Paul you have an email winging its way to you 

9

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 12:13:06 »

The pictures aren't working  it could be a problem with the website I don't know. What does the rubber diaphragm in the vaporiser do? The rubber o-ring seals in the old injectors were destroyed so it is a possibility 

I'll definitely record my journey home, how does the data come out will it just be a screen shot? One more question... is the temp. sensor that plumbs into the vaporiser just used to check the temp. for the switchover? Or does it influence the fuelling? As mine could definitely do with replacing. Sorry that was two more 

10

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 09:28:49 »

I haven't got a clue what vaporiser it is unfortunately. I've had a look at it and I can't see any identifying marks on it. Is it possible it's not doing a very good job??

Thanks for offering to have a look through the data  I haven't used the record function before, presumably I just press record and then drive off?

Do you have any pictures of your LPG kit layout in your engine bay? I'd just be interested to compare it to mine.

11

Omega General Help / Re: LPG Woes (Yes, still)

« on: 01 July 2011, 08:08:15 »

Well I spent my journey into work monitoring the map and making some adjustments. Looking at the vapour pressure it is running generally at 1.25 bar; at WOT from standstill/lower speeds I saw this drop to 0.79 bar (worst case) and at higher motorway speeds I didn't see it go much below 1.0 bar. I don't know if this difference may just be because the engine was warmer once on the motorway?

I think I may have overstated the lack of power to be honest it didn't feel too bad this morning but still doesn't pack the punch that petrol does. I checked out my lpg hoses last night and couldn't find anything suspicious although cylinder 2 fuel line from injector to nozzle was under a bit of strain but not kinked. I sorted this by turning the bracket slightly that holds the rail.

I was wondering this morning if my lack of performance is just a mapping issue. I'm struggling to keep the fuelling from going rich at anything over roughly 70% throttle. When I first installed the injector rails I really had to turn the multiplier up to bring it in line with my petrol map, but now they've settled in I'm really struggling to bring them down! I've circled two areas of concern - The first one is at about 70% throttle. The crosshair always hovers around 95-100KPa and if I turn the multiplier down it doesn't bring the crosshair down, it does however start running quite rough at that point. The second area is at WOT and it seems turning the multiplier down isn't bringing the fuelling down either.



The error message is the usual "injectors fully open" by the way. Maybe drilling my nozzles to 3.0mm was too much? I'm starting to think it's just an old basic LPG system and I will never get it performing to a level I'm happy with 

12

Omega General Help / Re: LPG Woes (Yes, still)

« on: 30 June 2011, 12:22:26 »

Thanks for your responses guys 

LD, I haven't replaced the liquid phase filter however I have had a look at it and there is no dirt/debris/nastiness at all. What do you mean by draining the heavy ends? I know I could set it to switch over to petrol at high rpm's but it's high loads as well as high rpm's that it's not happy with. How would I go about testing the solenoids? I guess a drop in vapour pressure may also be an indicator of this?

Kevin, I haven't looked at the vapour pressure when under load so I will have a look at this. I know that at idle it does sit at about 1.2 - 1.25  bar though. The LPG kit was fitted in 2008 I'm not sure how many miles it's covered though I'd have to look through old paperwork/MOT's.

I don't have my laptop with me today so I will update tomorrow with any vapour pressure findings. I'm also going to check over all the hoses to make sure there are no kinks.

13

Omega General Help / Re: LPG Woes (Yes, still)

« on: 29 June 2011, 22:19:41 »

I would like to switch to petrol at anything over say 90% load but as I only have the basic Stag 300 controller I don't think that's an option 

I'll try to watch the lambda values when I hoof it, if it was lean though where would I go from there? I don't understand how the map can be aligned to the petrol map but it just doesn't perform  :-?

Do you know if I could upgrade my controller? Would I have to swap out the whole loom?

One other thought (and it is a long shot)... could the quality of the gas be my problem? I always get mine from asda  :question

14

Omega General Help / Re: LPG Woes (Yes, still)

« on: 29 June 2011, 21:47:03 »

According to the map it's not going lean but my lambda reading only ever reaches 0.7 - 0.75v.

I whipped cylinder 1 spark plug out yesterday when I changed the leads and it looked a nice colour, neither rich or lean. If lpg runs rich will it leave sooty deposits on the plugs/exhaust etc?

15

Omega General Help / Re: LPG Woes (Yes, still)

« on: 29 June 2011, 21:13:34 »

Thanks for your suggestions guys, yes the vapour filter has been replaced. TheBoy, I wish I could put it down to the placebo effect but unfortunately it really is down on power on gas 

Albs, I think that really has to be my next step as I can't think of anything else! Even though the LPG map is good and matches the petrol map I still get the error message "injectors fully open" when I open her up. So i'm thinking that despite the injectors best attempts the gas just isn't getting through at WOT? Maybe I have 1, 2 or several twisted, blocked or leaking pipes from the injectors to the nozzles?

Who knows  All I do know is i'm sick of it not performing on gas. Even getting up to motorway speed is an effort on gas so I flick back to petrol and then once cruising go back to gas!! It drives perfectly well on gas and is fine when cruising/light acceleration, but anything demanding it just can't cope with.