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[chrisgixer]

Although, thinking further, there was a thump. But I can't remember if that was the trench that had been badly filled in running across the road (there's road works on that roundabout as they are replacing the traffic lights, hence I coulnt see if the car was turning off at the previous junction due to all the Orange barriers in the way) or due to the drive train. My first though was gear box banging into gear, but it couldn't of been as the revs refused to respond.

....unless the dif locked up. it's an LSD

[D]

I have had this happen to me on LPG. Seemed to disappear after a LPG filter change.

[chrisgixer]

Oh I've had loss of power, caused by fuel trims wondering off. Car just spluttered and bogged.

But this is differant. There was NO response from the engine. None of the spluttering, rough running, miss fires as the engine TRIED to respond but couldn't that you might suspect from poor set up.

I may as well of had my foot off the accelerator altogether.

[Webby the Bear]

Reading this one with interest, Chris. My car suffers from hesitation still in my opinion even though I've replaced a faulty front vacuum box. Obviously your problem could be LPG related and I sadly know nothing about the intricacies of that.

I've done a bunch of looking for vacuum leak things, replaced a few things, to no avail. Some on the net state that the 2.5 has a noticeable dead spot but DTM confirmed that with everything working properly there should be no flat spots at all. So God knows where to take it next.

But I appreciate that this sounds like a different problem.... not a hesitation, simply no power AT ALL for the first couple of seconds. Oddness!

Anyway, to the point of my response have you hada butchers for vac leaks?   

[Andy H]

Sounds like a momentary snafu... If you press the throttle with your foot on the brake on a diesel, the engine literally chokes itself... Wonder if this caused a similar effect, disrupting the plenum vacuum

I don't know about diesel engines (I think they use a vac pump in the alternator) but on a petrol engine the brake servo has an inbuilt vacuum reservoir that is good for about 3 or 4 applications of the brakes.

Stamp on the brakes 5 times in quick succession (with the engine idling) and the brake servo will dump enough air into the inlet manifold to make the engine falter. (Steady pressure on the brake pedal won't upset things because the servo doesn't let air in until you take your foot off the brake)

[D]

Oh I've had loss of power, caused by fuel trims wondering off. Car just spluttered and bogged.

But this is differant. There was NO response from the engine. None of the spluttering, rough running, miss fires as the engine TRIED to respond but couldn't that you might suspect from poor set up.

I may as well of had my foot off the accelerator altogether.

Exactly, no response at all, like it had died. Not happened since the LPG service and filter change.

[05omegav6]

Reading this one with interest, Chris. My car suffers from hesitation still in my opinion even though I've replaced a faulty front vacuum box. Obviously your problem could be LPG related and I sadly know nothing about the intricacies of that.

I've done a bunch of looking for vacuum leak things, replaced a few things, to no avail. Some on the net state that the 2.5 has a noticeable dead spot but DTM confirmed that with everything working properly there should be no flat spots at all. So God knows where to take it next.

But I appreciate that this sounds like a different problem.... not a hesitation, simply no power AT ALL for the first couple of seconds. Oddness!

Anyway, to the point of my response have you hada butchers for vac leaks?

Yours has a throttle cable, so direct connection from your right foot to the throttle...

With DBW cars, you can do what ever you want to the throttle pedal, and 9999 times out of 10000, it will react accordingly, but every so often the computer simply says No... question is why

[Sir Tigger KC]

Oh I've had loss of power, caused by fuel trims wondering off. Car just spluttered and bogged.

But this is differant. There was NO response from the engine. None of the spluttering, rough running, miss fires as the engine TRIED to respond but couldn't that you might suspect from poor set up.

I may as well of had my foot off the accelerator altogether.

Exactly, no response at all, like it had died. Not happened since the LPG service and filter change.

Drive it on petrol for a bit to see if it happens again so you can rule out LPG issues?