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[Bluebeard06]

My 1995 Omega 2.5TD doesn't go too bad as long as you are not in any sort of hurry. But if you give it even a modest amount of welly it drops a cog (as you might expect) revs up a bit but doesn't go any faster. In fact if you floor the accelerator if anything it goes a bit slower.

About half the accelerator pedal travel does nothing useful at all.....

But if feeling laid back on a straight(ish) road eg motorway the speed will slowly build up to at least the legal limit and beyond.

So what's the hangup? Why won't it rev a bit more??
Roger

[JamesV6CDX]

Any smoke from the exhaust? Funny noises? How does it start?

All the air inlet/turbo pipes secure?

[IrmscherKris]

But if feeling laid back on a straight(ish) road eg motorway the speed will slowly build up to at least the legal limit and beyond.

So what's the hangup? Why won't it rev a bit more??
Roger

Oooo er missus!

Is it an auto?

[Bluebeard06]

Ta for replies..

Sorry should have said. Yes it is an auto

And yep it starts reasonably well. I fitted a new set of glow plugs a few hundred miles back but the problem has always been there (and MIGHT be getting worse slowly. Not quite sure about that)
I don't think there are any special noises but then I am deaf and might not be hearing them. The Mrs says she thinks it is a noisy car but I don't think she has anything specific in mind..
Cheers
Roger

[JamesV6CDX]

You need to check that all the inlet pipes are secure before anything else

Then, read any fault codes... although the BMW lump isn't good at flagging the EML..

[IrmscherKris]

When did you last service it? (air oil and more importantly fuel filter)
When did the gearbox last get an oil change and filter?
Does the autobox change gear as you would expect?
What MPG are you getting?
Whip the air filter out - any sign of leaves or something blocking the breathing?

Start the car, get the missus to rev while you listen under the bonnet... Any area under there that sounds loud or throaty?


My moneys on the autobox, IMO VX messed up by making an auto TD.

[bconnelly]

It's taken me months to solve just this problem om my TD but I have. Firstly - a naff mechanic failed to reattach the air pipe from the air filter to the turbo, this by far made the biggest difference. If this happens then you hear the turbo sucking hard but as its not through the pipe the air flow sensor detects no flow and reduces the fuel supply. Next was the fuel pump in the tank (accessable through the boot) - 2 things here, it was blocked with gunge and the pipes to it were kinked a bit. Lastly, the gunge from the tank messed up the fuel filter so it needed replaced. The good thing is that none of these are expensive and every one made a significant difference.

Good luck

Bryan

[Pitchfork]

You should also check that the intercooler fan isn't seized up
This is in the O/S wing
As I found out, the electric motor had seized, this means that the air passing through the intercooler matrix is not as cool as it should be when it reaches the engine
Replacements are not cheap IRO £100
IW

[Bluebeard06]

Update.
What I said before does not now appear to be quite right. This seems to be a new event.....
The position now is that, today at any event, it is much worse. It starts and ticks over ok and I can pootle up our local lane to the main road without trouble. As I drive off down the road the gears change ok but it is difficult to pick up speed. As it gets to about 25-30 it is not accelerating and not going fast enough to get into top gear. There are clouds of smoke behind. Within 1/2 mile I give up and drive home.... just about!!

We had to do shopping so I haven't had a chance to investigate joints/filters etc but will have a look tomorrow. Personally I would say it wasn't a gearbox problem as it changes at the speeds I expect it to.

I have had the car for about 15 months and haven't changed/checked anything except the glow plugs.
Cheers
Roger

[TheBoy]

If you put the box into 1, is it better then (obviously keeping below 20/30mph)

[Bluebeard06]

Guys
Thanks for your help. I shall keep the printout for another day!
Now the problem has been pinpointed it is SO obvious that I could kick myself. I guess any one of you might have been right but as it happens IrmscherKris was especially right about checking filters. After looking round to make sure nothing obvious was falling off I started with the air filter. It was black. They usually are of course but this one seemed VERY black. The engine must have thought so to as it had partly sucked the paper into a dome shape and out of the rubber edging. With a new filter fitted and on a trial run I was up to 70 from cold in the space of 1/2 mile!!! The initial black cloud vanished (presumably as the new super air flow cleaned the system!!) and it now accelerates faster than it ever has...

I bought a new fuel filter but it is not fitted yet as it is not obvious how. I have the problem that I have the Haynes Omega manual but this only covers the petrol versions so I have to fumble & guess on the diesel bits..
Roger

[Pitchfork]

The undisputed expert on the TD (BMW) is 'The Boy'
He has a passionate relationship with Tractor Engines & posted this url a few months back

http://images.omegaowners.com/documents/25TD/M51D25_Engine.pdf

It's just what all of us with the minority interest in the beasts were all searching for!
IW

[TheBoy]

Fuel filter is a simple unscrew, fill new one up with diesel magic, and screw back on. Will run a bit rough while its drinking the diesel magic.

The diesel fuel filter should be drained of water regularly, as the water will damage the injectors

[Bluebeard06]

Guys
Particularly 'The Boy' and the PDF you posted. I can now see that the replacement fuel filter they sold me at the shop is the wrong one, probably for a petrol one. Looking in the PDF suggests that it is pretty similar to an oil filter and is removed/replaced the same way. With the sun so low in the sky (as it is at the moment) it can make looking in the engine compartment difficult but the illustrations in the PDF are super so I will now have a clear idea of what I am trying to do.

Not that I have a problem in that area but I am a little concerned about routine maintainence and an 'oil & filter change for the auto gearbox' as mentioned by IrmscherKris. I haven't needed to do this routinely on all the previous auto gearbox cars (SAAB's) that I have had. So what needs to be done on the Omega TD auto?
Cheers
Roger  

[TheBoy]

Yes, that is the fuel filter. Its like an old fashioned oil filter, but with a little tap on bottom (to drain off the build up of water).

ATF change:
Basically, remove both auto sumps. Change filter, and clean the magnet in the big sump. If pieces of thrust washer in little sump "Oh 'dangle berries'!" - will need replacing, which is a box off job.  Refit, and refill is the basics.