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[Andys VXR]

No its only a £100 argos RAC one

[Andy H]

Yes i cleared the codes with my little code reader but done the pedal trick after that and no codes are you saying take the wire of the throttle body

Can your code reader show 'live readings'?

That's a pity.

My thinking is that 4000rpm would require a big air leak. If it is unmetered air then I am surprised that the engine starts (though maybe it isn't as big an issue for fuel injection as it would be for carburettors )

If you can get live readings you would be able to see what the ecu thinks the throttle pedal and throttle body positions are and see how much air is going through the mass flow meter.

[Entwood]

Has anyone played with the throttle bodies at any time ?? Just wondering if you have a sticking throttle plate that moves OK on big throttle movements - revving it hard on the drive - but sticks on small movements when driving ??

There is a "how to" on cleaning/setting up the throttle bodies .. might be worth a look ??

http://www.omegaowners.com/forum/index.php?topic=90624.0

[sneakypenguin]

It's just strange that the ecu hasn't stored any faults, as andy H says It must be a big leak to cause such a difference in rpm, I would check the icv, in case for some reason it was sticking in the higher rev range than lower.

[05omegav6]

As a thought, are both the intake elbows from the first multiram to the throttle body They can be a bit of a pig to refit

[Andy H]

It's just strange that the ecu hasn't stored any faults, as andy H says It must be a big leak to cause such a difference in rpm, I would check the icv, in case for some reason it was sticking in the higher rev range than lower.

3.2 is DBW (drive by wire) so there is no separate ICV. The ECU maintains idle speed by controlling the throttle position directly.

From the limited diagnostic info we have so far it points to the throttle butterflies not closing but whether this is because the throttle motor is faulty, the throttle body is faulty or the ECU is holding them open because it is getting duff sensor input is anybodys guess.

I haven't mentioned a vacuum leak because a vacuum leak big enough to hold the revs at 4000rpm should trivial to find.............

[05omegav6]

It's just strange that the ecu hasn't stored any faults, as andy H says It must be a big leak to cause such a difference in rpm, I would check the icv, in case for some reason it was sticking in the higher rev range than lower.

3.2 is DBW (drive by wire) so there is no separate ICV. The ECU maintains idle speed by controlling the throttle position directly.

From the limited diagnostic info we have so far it points to the throttle butterflies not closing but whether this is because the throttle motor is faulty, the throttle body is faulty or the ECU is holding them open because it is getting duff sensor input is anybodys guess.

I haven't mentioned a vacuum leak because a vacuum leak big enough to hold the revs at 4000rpm should trivial to find.............

IIRC the plug to the throttle body can be a bit tempramental. Might pay to unplug it, blast it with an air line/air duster, refit it and secure it tight with a cable tie

[Andys VXR]

I think im going to try and get another throttle body just for the hell of it. I started it today and its fine revving it on drive but soon as you drive it the revs are getting stuck. They slightly go up and then it takes a very very long time for them to come down aaaarrrrr its got to be something to do with throttle body hasnt it

[05omegav6]

Always just before Christmas bump