Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: Faisca_40 on 20 January 2026, 08:02:10
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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.
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Your English is good :y
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.