Join Date: Jun 2015
Location: Dublin, Ireland
My 159 can be a bit slow to start, so I asked my guy to check the glow plugs while he was in there; apparently 3 of them are the wrong length, being .5" shorter, so that diesel nevers gets warmed. the NGK site says they're correct, but it seems they're not. Might be worth pulling them out and checking the length.
I'd be more inclined to check the battery; the voltage could well be fine, but the CCA (cold charging amps) could be too low; my ki car had a faancy racing battery, that was consistently 12.6V, but only measure 16CCA (it's rated to 300), because it has been left on a shelf too long. It's been mothballed and a new battery expensively bought.
I replaced my 159's battery a few months ago, and the issue was significantly reduced.