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[Opel 2.5TD]

I have a 2.5 td with 170000 on the clock . Just before Xmas it started running rough at idle. As soon as throttle is opened it runs fine. The problem can come and go intermittently. I have followed old thread advice and filled fuel filter with Diesel Magic twice. It has improved a little but not cured. Is it worth repeating the Diesel Magic treatment or could there be another solution?

[Agemo]

Always worth another go with Diesel Magic. Also, have the Leak-off pipes been replaced?

[symes]

dont know much about diesels but maybe split vacuum pipe somewhere ??

[Opel 2.5TD]

Thanks for advice

The leak off pipes have been replaced a couple of times, not leaking now as far as I know.

[Opel 2.5TD]

In case anyone else gets this problem, it has cleared now without repeating diesel magic trick but after using a few more tanks of regular non supermarket diesel. This is despite a diesel "expert" saying I would need a new pump at far more than the car is worth. So it looks likely that it was dirt in the injection pump caused by extended (10 months) running on 100% Bio Diesel, perhaps not surprising as it is recycled cooking oil!  I won't risk using it again.

[Omegatoy]

great news, looks like the diesel magic loosened the dirt suffiently to let it be pushed out!!