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MG MGF Technical - Momentary loss of power...

Hi all,
Now it has happend again to my VVC! When going in 3īrd flat out,(NOT touching the rev.limiter,but close) and quick changing to 4 gear there is on few and far apart occasions a total loss of power for less than a second....
Then the engine recovers without a hiccup and acceleration continues as strong as ever.
My own wild guess is that the rapid pressure fluctation between fully open and shut throttle upsets the MAP-sensor for a fraction of a second.
Anyone had this behavour ? Any guesses what it can be ? The car is as healthy as can be and is a strong performer with the usual "add onīs" and giving 172 hp on the rolling road.
BR, Carl.
Carl

Hi Carl,

Possible there's a loose contact somewhere, making itself evident when the engine is flexing against the mountings? If you do a slow change, does the problem still occur?
Mike Hankin

No, only on "spirited driving" with fast gearchange.
Might add that I have re-worked the gearchange so fast and smooth gearchange is possible ;O)
Probably this slight hesitation on very few occasions is no trouble ,more a "feature"... / Carl.
Carl

My F begun doing that last year. A few days later the MEMS was forever gone.
I sincerely hope that will not be your case. Mike
JM Vega-P.

Hi Carl,

In December I have got sudden lost of power for a second during acceleration. It also happened occasionally but like in your case it wasn't at 3rd gear or during quick change.
As a result in January my ignition coil melted.
I have replaced both but problem occured (car was running on 2 cylinders). Someone told me that MEMS can be borken but before ordering new one I have checked wires, replaced part of them from igintion coil 1 to loom and since that time everything is OK.
I not sure if it helps in your case but...
marius

Hi all,
thanks for the input, your comments makes the future looking bright and sunny ! ;O))
More seriously, will have a total check of ignition and possible bad connections in cables etc.
But still it seems to me that it might be a "feature" by the MEMS,very seldom noticed and as said only on spirited driving/gearchange at speed. / Carl.
Carl

Carl, I'm not so sure that this is a 'feature' of MEMS - if it were, there would be more reports of this.

Makes me concerned that this is a problem with your car - whether it is MEMS related, or due to some other fault, I can't say - but I wonder about the IACV and the rpm 'soft landing'?
Rob Bell

Errm, ... just an idea..
What about fuel amount supplied by the fuel system ??
Dieter K.

This thread was discussed between 07/05/2005 and 10/05/2005

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