On Wed, 15 Jul 2009 14:45:06 +0100, Dave Plowman (News)
> wrote:

> In article >,
> Redwood > wrote:
>> Thanks for the replies, it does sound like a fuelling problem. I'll get
>> hold of a fuel pressure gauge and check the correct pressure is
>> reaching the injection unit. Autodata says to manually trigger the
>> pump and reading should be between 0.8 & 1.2 bar and hold at 0.5 bar
>> after 5 mins. Should at least rule out any filter, blockage or pump
>> probs.
>
> The fuel pressure effects the entire engine range. If it were wrong it
> wouldn't idle properly either. I suppose a blocked filter could have more
> effect at high demand, though.
>

Yup, if the filters clogged they're fine at low demand & bad at full bore.

> The range of 0.8 - 1.2 bar seems awfully wide to me - on mine a couple of
> PSI makes a big difference. Although of course the pressure does change
> depending on engine vacuum. But I'd expect the static pressure to be much
> more accurate than that.
>

1 bar sounds low anyway.