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[Andy H]

So... The plenum has been off. I'd be checking and rechecking the o-rings... All of them. And the breathers

I would double and triple check the vacuum connections.

If you have proved that the rear multiram is working then I wonder if the non return valve has failed on the vacuum tank :-/ When the throttle is wide open at low RPM there is no vacuum in the inlet manifold so the system depends on stored vacuum from the vacuum reservoirs to operate the multirams.

[JamesV6CDX]

If its any help james,the fuel filter was changed some time last year,along with the plugs,and new dispack on drivers side.

Cheers mate, that's very helpful

[JamesV6CDX]

Right,

Just to play devils advokate:

 - Plenum off, and inlet ducting removed.

 - Cambelt cover removed, timing checked. 100% spot on.

- Plenum re-fitted, all O rings in place, vacc pipes connected and routed correctly.

Fired up first time, sounds lovely as always, but still nowhere near as powerful as before 

[jonnycool]

It's been known on mine for the MAF to appear to be connected when it isn't, just double check that the connection is fully home just to eliminate it

[JamesV6CDX]

It's been known on mine for the MAF to appear to be connected when it isn't, just double check that the connection is fully home just to eliminate it

MAF readings fine on live data, indicating the ECU is talking to it OK

[Kaycee]

I too had this problem last year and by coincidence i too had the thermostat changed the car was flat. I took it back to the garage who did test drive and said "nothing wrong sir" I said its not the same, are all the vac pipes right he said yes and i was there when we had a good look round at the pipes. Now im not saying its the same fault as yours but..... on closer examination there is a small vac pipe under the throttle housing that is difficult to see this was not coupled up, on connection voilla car was  back on song. the mechanic uttered a few expletives and said he could not believe that a small pipe,  could make that much difference but was ok after that if you havent checked yours its worth a look
Robert

[JamesV6CDX]

I too had this problem last year and by coincidence i too had the thermostat changed the car was flat. I took it back to the garage who did test drive and said "nothing wrong sir" I said its not the same, are all the vac pipes right he said yes and i was there when we had a good look round at the pipes. Now im not saying its the same fault as yours but..... on closer examination there is a small vac pipe under the throttle housing that is difficult to see this was not coupled up, on connection voilla car was  back on song. the mechanic uttered a few expletives and said he could not believe that a small pipe,  could make that much difference but was ok after that if you havent checked yours its worth a look
Robert

Many thanks Robert

Very good info, but I've checked this one 

[aaronjb]

I too had this problem last year and by coincidence i too had the thermostat changed the car was flat. I took it back to the garage who did test drive and said "nothing wrong sir" I said its not the same, are all the vac pipes right he said yes and i was there when we had a good look round at the pipes. Now im not saying its the same fault as yours but..... on closer examination there is a small vac pipe under the throttle housing that is difficult to see this was not coupled up, on connection voilla car was  back on song. the mechanic uttered a few expletives and said he could not believe that a small pipe,  could make that much difference but was ok after that if you havent checked yours its worth a look
Robert

That'll be the pipe that dropped off twice when I was wiggling my plenum back into place Annoying little thing, it is.

[JamesV6CDX]

Just tested the vaccum tank as best as I can.

I ran the engine for 5 mins, and turned it off - and then with the laptop, actuated the rear multiram. It operated 7 times, before using all the vaccum.

I'm guessing this indicates Vac is, in fact, OK?

Car is still not as responsive as it should be.

Also - what is the required idle speed for DBW engines? It's showing a consumpt. of 4gal/h on idle, in gear, when fully warmed up. Seems a little high to me - esp. as aircon compressor isn't running??

[Martin_1962]

0.3 gallons per hour 2.6

[JamesV6CDX]

0.3 gallons per hour 2.6

About what I'd expect.?

[iainb]

James,  consider putting your car on a rolling road to get an idea of the output figures at the wheels.
This may help you with your diagnostic !

[JamesV6CDX]

Update

Kickdown tested by activating, and checking live data. Working fine.

I kicked it down at 60mph, earlier

And it took an age to get up to any higher speeds. Felt like a 4 pot!

[SMD]

My 3.2 is feeling sluggish too but I have no skills to do everything you did. From standstill acceleration is quite slow. No fault codes.

Please keep this thread updated.

[JamesV6CDX]

Can't decide if it's getting any worse, or not.

Hopefully tomorrow will shed some results, Mr Wood is going to glance his eye over it for another opinion 

On a brigher note, the AR35 seems better since it's 0.5 litre top up  :-/