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31

Omega General Help / Re: 2.5V6 engine take-up sluggish

« on: 02 September 2022, 17:26:58 »

Every day's a school day!!

No fault codes showing (apart from 21 earlier [paperclip] when I forgot to plug the ICV plug back in) doh.

I'll make a start on swapping the tanks - handy having more than 1 car.

I've been through all the pipes in the engine bay with a fine tooth comb, nothing chaffing or likely to cause a leak.

32

Omega General Help / Re: 2.5V6 engine take-up sluggish

« on: 02 September 2022, 17:00:45 »

Thanks so far for the assistance.

IAC pipe now on FPR -  rear multiram now connected to front multiram pipe - problem remains.

Disconnected and sealed all cabin & HBV vacuum pipes to eliminate - problem remains.

No vacuum being held after switching off engine.

Could it be the vacuum tank?

33

Omega General Help / Re: 2.5V6 engine take-up sluggish

« on: 02 September 2022, 16:37:45 »

I'm beginning to think that some re-plumbing might be in order, although both cars have been piped this way and working well for over 10 years (as acquired). I've also seen other images on this forum of cars piped this way. Even if it is incorrect, this problem only started yesterday.

So what we're saying is, this pipe should go to the fuel regulator?

34

Omega General Help / Re: 2.5V6 engine take-up sluggish

« on: 02 September 2022, 16:08:06 »

In the Omega maintenance guide - vac pipes setup, it shows both multirams piped from the vacuum tank (near the altenator), whereas on both my cars the rear multiram is piped from the nearside air intake  - according to other sources this should connect to the fuel pressure regulator which isn't shown for clarity on the maintenance guide.

They've both been working fine with this arrangement.

Should that nearside air intake pipe go to the fuel rail? It doesn't appear to produce vacuum when engine is running.
 

35

Omega General Help / Re: 2.5V6 engine take-up sluggish

« on: 02 September 2022, 15:17:46 »

There's been no recent work on the car so it's piped up correctly (was running fine until yesterday).

So for clarity, should I be looking at front or rear multiram for this low RPM problem?

36

Omega General Help / Re: 2.5V6 engine take-up sluggish

« on: 02 September 2022, 15:07:11 »

Both front and rear multirams operate when a vacuum pipe is connected. When you say 'actuator', do you mean the electrically operated valve?

Vacuum present at front T piece after vacuum tank, but rear looks to be fed from the nearside air intake which doesn't seem to have vacuum.

37

Omega General Help / 2.5V6 engine take-up sluggish

« on: 02 September 2022, 13:52:57 »

Hi Guys, I'm looking for suggestions as to where to look next regarding sluggish take-up on my 2.5V6 engine (manual transmission).

Today I've taken the plenum off, checked all the vacuum hoses and connections and I've still got the same problem. It's purring like a kitten on tickover, but pulling away it's sluggish and the engine vibrates. Over 3000 revs and it runs sweetly and accelerates well, but anything under that it isn't happy.

I've ruled out plug leads, spark plugs, dis pack, oil leaks or water in the plug wells and breather system. I've tried to understand more about the multirams and have an identical car for which I can compare with. I've read that blipping the revs to over 4000 should actuate the rear multiram, but neither of the engines do that.

So I'm now stumped.... hoping someone may have a suggestion or know the root cause.

38

Omega General Help / Re: Omega fuel filter elbow

« on: 15 August 2022, 10:36:05 »

39

Omega General Help / Re: Identification of plug & socket

« on: 28 July 2022, 10:20:18 »

Replies much appreciated thanks. With the air-con not having worked for many years, I'm guessing there's little or no refrigerant left in the system anyway.

It may have been a futile attempt to repair the broken wire under the circumstances, but it would have annoyed me with it just dangling there anyway. 

40

Omega General Help / Re: Identification of plug & socket

« on: 27 July 2022, 19:28:37 »

I unplugged it from the white socket to repair the wire - I suspect it may have something to do with the air-con, but that's not worked for many a year and is always set on ECO.

It's now repaired and doesn't make any difference from before. Maybe it took a fuse out when chaffing against the chassis?

41

Omega General Help / Identification of plug & socket

« on: 27 July 2022, 17:58:36 »

Hi Guys, Just crawling around underneath the Omega doing a few pre-MOT test checks and came across this broken wire. Repairing and soldering / sleeving shouldn't be a problem, but it would be nice to know what it's for. Near side, bottom of engine near sump flange 2.5 V6 manual. Cheers.

42

Omega General Help / Re: Power steering hoses.

« on: 28 November 2021, 19:02:19 »

Any help? Nothing in the cooler group needs to be removed. (V6).

43

Omega General Help / Re: Could this be the end of my Omega?

« on: 05 August 2021, 11:39:31 »

Changed oil to 10w40 and the leak doesn't seem to be as bad now - it's covered around 150 miles in the last couple of weeks, so that's a result.

It passed its MOT test this morning, just advisories for rear tyres, so I'm well pleased. The baffles seem to have disintegrated in the back box, so it's sounding a bit throaty, so that was another unfounded concern.

Happy chappy 

44

General Car Chat / Re: Another year..another MOT..another pass

« on: 05 August 2021, 11:35:27 »

Nice one on the pass  it's a great feeling having another year out of the Omega.

Mine passed its test this morning, so there's at least 2 of them still on the road!

45

Omega General Help / Re: Could this be the end of my Omega?

« on: 23 July 2021, 15:58:09 »

an OIL leak must create a puddle on the floor of 7.5 cm (3 inches) diameter within 5 minutes of idling (engine warm) to fail a UK MOT .

With those sort of parameters, my fears for the test appear to be unfounded, but a leak is a leak.

Oil now changed to 10w40 and have cleaned the breather system this afternoon. It certainly can't be any worse than it has been.

Thanks to you all for your input - much appreciated.