Vauxhall Signum pulsing

Car: Vauxhall Signum
Variant: cdti150 exclusive
Model Year: 2006
Categories: Running Rough, Starting & Power Loss
Ok, so the latest problem! Whilst driving at normal road speeds, around 40, there is a pulsing or surging feeling coming from the engine and the car physically feels to pulse. Also when idling the revs fluctuate from as low as 400rpm upto 1200.

I have no faith in this car anymore, too many issues, and just before I go on holiday!
Posted: Jul 31, 2012 (12 years ago)
Thanks for that. There are no DTC's and no warning lights or dashboard lights appearing to indicate of anything specific. I'm not great with mechanics but do you know of a site with a diagram of this engine with the parts labelled so I can identify them and try cleaning or replacing them?
Posted Aug 2, 2012 (12 years ago)

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