2.0 CDI hesitation

[marinabrian]

Originally Posted by James.uk

I fawt coasting in idle (feewheeling) was illegal in the UK????? innit??
...

No, not even running off without paying for a key transponder is, apparently
You old scallywag
Brian

[Mike Noc]

Originally Posted by reworht

Mine does exactly the same - but not every time. There is no pattern at all as to when it does and when it doesn't - hot or cold makes no difference. I don't believe it's MAF related, as it was there both before and after the fitting of brand new Bosch one. Tickover INSTANTLY goes back to normal when I release the brake pedal - if I keep my foot on the brake, it take a few seconds longer.
Many years ago, it was not unusual for engine revs to drop when braking - the older type vacuum servos seemed to place a load on the engine as they operated - or is that my memory fading since the sixties ?

It has been suggested that it is vacuum related, but on the diesels there is no vacuum to be had at the manifold so a separate vacuum pump is fitted.

Can't see that having any effect on the engine load, and the revs return to normal once the car is stopped even if you leave your foot on the pedal.

I wonder if it is more tied into the brake pedal switch signal itself causing the ECM to drop the revs? But there must be another factor involved or all the diesels would do the same.

[Mike Noc]

Originally Posted by marinabrian

No, not even running off without paying for a key transponder is, apparently
You old scallywag
Brian

Brian do you get this on your diesel and if so does the magic wand shine any light on the cause?

[James.uk]

Ooeerr Sorry Brian, I didn't realise you fitted anything, just thought you told it to behave itself.

Not to worry, I will sort you out either by paypal or when we meet again, if you PM me your choice and the amount I absconded with..
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[peter lee]

Hello,
Sorry for reviving an old thread, but my car has been suffering the same problems. Anyway, over the last 12 days my car has been to 3 different garages, and been put through a T4 diagnostic without any insight into the problem.
I have been trawling through this and the mg/rover forum looking for a solution, and saw that sometimes the problem can be cruise control related.
Anyway, finally I found what was wrong with it, the switch on the clutch pedal was damaged, both the black clip and the actual white switch inside were faulty.
10 minutes to change both and the car is as sweet as a nut again. It may not be the answer to everyone's problem, but it was 100% the cause of mine. Just to prove it, I put the old switch back in and the judder was back.

I have now done about 150 fault free miles, and my smile is firmly back.

[Mike Noc]

That's interesting Pete. Did the cruise control work OK before you changed the switches?

[peter lee]

Tbh, thats what led me to the problem. I rarely use the cruise comtrol. But on the rare occasion I did it was a bit hit and miss. All three garages didn't think it was related. When I started wiggling the switch, either the CC would work, OR the judder stopped.