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1

Omega Electrical and Audio Help / Re: 2.5td hot start

« on: 26 January 2026, 08:21:01 »

Your English is good

My TD never suffered this issue, but I know it was a reasonably common thing for others.  I'm not sure anyone really truly got to bottom of it, with there potentially being multiple causes.

Depending on age, the glow plugs might be enabled even when warm starting, though I don't think the DDE 2.0 and DDE 2.1 ones do.

I would see if you can prove it's the in-tank fuel pump not priming that is the issue, or that it's actually working - the TD engined ones had a high failure rate, but the main injection pump is more than strong enough to compensate most of the time. If you can prove that fixes it, then your idea sounds like a viable solution.

Hope that makes sense.

Sorry for the late reply.
Because of work I didn't made tests yet.
The glow plugs are new and when cold it starts right away.
I don't know about the part if you can force the glow plugs on even when hot.
Probably this weekend I will conduct some tests, warming up the car and forcing the pump to prime. If it starts right away the problem is found. In the meantime, since i need the car because it's my daily,  I found a injection pump kinda cheap and talked to a specialist to repair it. But I'm still searching for new injectors also including the 4th cylinder one. To repair in conjunction with the pump.

2

Omega Electrical and Audio Help / 2.5td hot start

« on: 20 January 2026, 08:02:10 »

Hi all.
So, i have an 1998 omega 2.5td and as the majority of you know, with the age, they tend to have a crappy hot start. Mine is not that bad, 2 to 3 seconds of cranking the engine.
Now, I know my injection pump probably is telling me that it needs to be repaired. And I'm going to repair a spare that I have, then change it. In the meantime I was researching why it starts to do the hot start issue and realised that when hot the electrical fuel pump does not prime the circuit, because it's controlled by 2 signals, one is the alternator warning light, the other is the number 1 glow plug. The alternator signal only works when the engine is running, and the glow plug when the engine is cold. I started to think and if I removed the signal from the glow plug and used a timmer relay to simulate that signal it should work as the timer relay resets itself when the ignition is off, so every time I put the key in the number 2 position it should prime the circuit.
The only test that I did was when hot connected 12V to the glow plug signal for 2 or 3 seconds and the engine started almost immediately.
What do you guys think?
I know that there is some bypass thing that tells the engine is cold so the glow plugs work even when the engine is hot, but I don't like that...
I was thinking of making the thing with the timer relay reversible, so even if this don't work I can put everything as it was.
Thank you in advance for all your opinions
And I'm really sorry for my English as I know is not perfect.

3

Newbie Welcome Area / Re: Newbie from Spain

« on: 12 February 2025, 10:06:09 »

hi, welcome to OOF, i also have a 2.5TD from 98 in Portugal. mine is now stopped because the crank pulley vulcanized rubber broke. I'm waiting for a new one. mine has 295k km

4

Omega Electrical and Audio Help / Re: clocks change

« on: 10 December 2024, 12:52:20 »

Depends on what car it came from and if it has been correctly delivered paired.

Unless you're fitting the NCDR1100 with it although if it's not from an Omega, it probably won't work.

ok, thank you for the reply's, i'll stick with the MID. 

5

Omega Electrical and Audio Help / Re: clocks change

« on: 10 December 2024, 09:47:26 »

if i had an Siemens NCDR 1100, the color display will work?? just asking...

6

Omega Electrical and Audio Help / Re: clocks change

« on: 10 December 2024, 09:34:57 »

No. You need double DIN head unit paired with that color screen+ wiring harness. Color screen is controlled via head unit, not through wiper stalk. Other option is to find HU from Astra/Vectra with color screen but there's still mater of wiring..
Speedo cluster is separate part and I believe they are interchangeable as long as transmission is the same, but I'm not sure. M57 ( DTI ) has ''drive by wire'' instead of cable, so there might bee differences.

ahh ok. the transmission is the same(manual) mine is drive by wire also, no cables. guess i'll stick with the MID display. 

7

Omega Electrical and Audio Help / clocks change

« on: 10 December 2024, 08:45:25 »

hello all
i have an omega 2,5td from 1998(mini facelift) and my rev counter and temp gauge arent working great. my friend has a complete one with the color display(mine has the MID one) from a 2.5DTi from 2001. itīs possible to apply the clocks and the color display in my car?
tank you all

8

Omega General Help / Re: 2.5 and 3.0 head gasket sets.

« on: 05 December 2024, 15:40:04 »

the ''holes'' for the cylinders are bigger on the 3.0(83mm for the 2.5 and 87,5 for the 3.0), i'm not sure if it has more differences.

9

General Car Chat / Re: How old is your car(s)?

« on: 04 December 2024, 16:44:02 »

1989 Opel Corsa A(Vx Nova) 1.2S(with 1.3 engine)
2001 Opel Astra G 1.4 16v caravan (is going to the scrapyard )
1998 Opel Omega B 2.5TD
Had a 1998 Rover 200 with the 1.4l, 103Hp sold it last week, was a good looking car but that engine is a no...

10

Omega General Help / Re: two questions

« on: 23 October 2024, 08:00:06 »

Not sure how beyond trying a different stalk, and perhaps dismantling it and checking for obvious wear/damage.

But your first point of checking is the fuse

Closely followed by the clutch and brake switches...

still haven't got time to check all of those, work has been chaotic, i have checked the fuse( fuse 15 i believe) and itīs good, started to remove the plastic cover in the pedals, but have not yet checked the switches.  maybe today I'll have the time to do it.
also I've started to look for a "new" stalk, they are not easy to find here in Portugal. but i managed to find one with 2 wires( there's a lot of the 4 wire ones), if everything points to the stalk i will buy it. could not find brand new ones with only 2 wires...

11

Omega General Help / Re: two questions

« on: 21 October 2024, 16:40:20 »

Today i will test the switches, brake, clutch. and i want to test the stalk. far from i saw the TD stalk has a series of(i think) resistors, is any way i can test it?

12

General Car Chat / Re: So what have you done to your car today?

« on: 21 October 2024, 09:36:46 »

Today, just drove it to work, my other car battery went flat. 

13

Omega General Help / Re: two questions

« on: 18 October 2024, 10:04:29 »

If the airbag wiring is unplugged without disconnecting the battery it can put the light on. Needs the fault code clearing and as long as the wiring is ok then should be sorted

As you have Haynes, the.diagrams will guide you to the wires to test for the clutch and brake switches. But don't forget to check the fuse as well and also the plug to the cruise control module (under the bonnet, and connected to the throttle cable mechanism) if your car has a cable throttle.

 my car as electronic throttle. where's the CC module?

14

Omega General Help / Re: two questions

« on: 18 October 2024, 09:02:56 »

good morning to all, and thank you for the reply's.
so new update, courtesy lights are on(still need to go get a new central locking module), but have no timer. I've managed to find the haynes manual with the electrical diagrams. so managed to find the wires that i needed to jump.
about the cruise control, the stalk i have is with 2 wires plug. and i checked and i have the clutch switch, but didn't have the time to test it.
another thing i forgot to ask is, the airbag light is on, and i found the passenger pretensioner yellow tag to be a little out. not even half of it. could that be the reason for the air bag light? i did not yet connected to the car, my laptop has gone kaput.   
I've checked all the plugs under the seat, for the airbags and everything seems to be ok. the car has not been in an accident, but the previous owner told me that about a month and half ago they removed the passenger seat to repair the motor for the seat rise, and after that the light stayed on.

15

Omega General Help / Re: two questions

« on: 15 October 2024, 18:04:10 »

so, I'm talking to a friend of mine that as an omega V6 caravan, even if i can get the central locking module and remote from im, I'm still fuc... because of the immobilizer. right?

No, they should work as long as the car are the same age, ie both '98.

You simply swap the remote fobs. Just make sure that the transponder chip remains in your key... This chip is the immobiliser part

Ok. Thank you.
Friday  I will go se if the car is from the same year. I think it is.
I'm really sorry for all these questions, but I've allways loved this cars. And this one was cheap(at least in here) around 1000€(around 830Ģ). It is in running orde. So I'm really forward to put it basically in factory setting. Apart from the exterior(it has a body kit, I think is a steinmetz replica, it's just a front and rear bumper lips and side skirts) and probably an 16" wheels( it as 15").