Originally posted by foxcasper
I have confirmed with contacts that it is a problem with gas-pedal and engine speed versus torque requirement calibration mapping.

I hope they fix it in the cal release with the stalling problem.

Is that cal available yet? (stall) - i know it was released from the supplier back in June... I haven't a local dealer yet so haven't bothered calling.

I have heard that the Cal fix in on this months CD, here in Oz. Also foxcasper you posted about turning off the Air on WOT, asked about it to be told "No can do, car does not need that functions like other underpowered cars". Can you confirm that this option is still buried some where in the firmware.

Thanks

Ps good to see you are still about.:D

>>I haven't the cold start or the yo-yo'ing with my July >>5th build MCS. However, I've only put 650 miles on it so >>far. I have a feeling both issues show up later on or >>after the run-in period.

The yo-żo“ing was there form the first day on.
I simply was to excited to think about it.

Originally posted by snoopy


I have heard that the Cal fix in on this months CD, here in Oz. Also foxcasper you posted about turning off the Air on WOT, asked about it to be told "No can do, car does not need that functions like other underpowered cars". Can you confirm that this option is still buried some where in the firmware.

Thanks

Ps good to see you are still about.:D

Thats good. Must have missed it on my Car snoopy (delivered 30th August after a week at the dealers) as mine has this "characteristic" as well.

:)

Originally posted by Basil


Thats good. Must have missed it on my Car snoopy (delivered 30th August after a week at the dealers) as mine has this "characteristic" as well.

:)

hmm I was hoping your car was going to be the first with the new software. :rolleyes: Oh well We we have to wait until some one needs some work done on their car to see if the new software is really here. :)

We just ticked over 1000k tongith, and while it is still there, it is definately better.:)

I think its more noticeable when the engine is still cold

I've definately got the yo-yo problem on my 26th May built Cooper S which is now at 1950 miles.

It's going in tomorrow (for the second time) to get the seat squeek looked at again and the fogged up rear light replaced and the rust under the bonnet on the suspension turret re-sprayed....

I have just written up a list - two copies - one for the service reception and one for inside the car - and have copied some of the comments off here onto it, so we'll see if there is any improvement re the yo-yo-ing.

I won't be able to post an update till the 16th September though, as I'm away on my hols on Friday - Max is getting looked at whilst I'm away :cool:

John

Next week our car goes back for the 6th time with the yoyo fault. The man from Mini thinks that the fault may be the Supercharger or fuel pressure. Ironically our car was built 26/05/02, when someone else posted the same fault. If the car was not so good we would have asked for our money back and bought something else. As owners we must stick together and get Mini to sort this problem out ASAP. My dealer makes out that we are unique in having this problem. Please make your dealer aware of this web site and together we must overcome!

My ZX3 does the same thing, from what I have heard its an issue with the emissions control. It has something to do with the EGR valve opening and closing... I will research it and let you guys know..

Despite the 'feeling', could someone record the sound? Does the rpm rise and fall a little, in conjunction with the yo-yo, or surging feeling? Is it that obvious? Or is this subtle.

See, the problem with these sorts of boards on occasion, is that I read this, and start imagining I have whichever affliction on my car.:rolleyes:

So, how prevalent is this feeling? I was confident I HAD it, but now, not so much. Does it go away?

Have 850Kms on the odometer and I am having cold start problems as well as the "yo-yo" surging problems passing 2800-3000RPMS! :eek:

Hmmm!

Originally posted by noahe
Despite the 'feeling', could someone record the sound? Does the rpm rise and fall a little, in conjunction with the yo-yo, or surging feeling? Is it that obvious? Or is this subtle.

See, the problem with these sorts of boards on occasion, is that I read this, and start imagining I have whichever affliction on my car.:rolleyes:

So, how prevalent is this feeling? I was confident I HAD it, but now, not so much. Does it go away?

Drive with constant RPM at 2000 RPM in 2nd gear.
Then add throttel for smooth acceleration (about 1/3 throttle)

If it is as obvious as in my car you will start noticing at about 3000 and it will vanish shortly after 4000.

I can always reproduce it, but its not lile the RPM are YOYOOING its basically speed of change of the RPMS that is YOYOOING. Like YOYOOING POWER......

It's likely the engine management. In the good old days, when you floored the pedal, the carburetor butterfly went wide open. With the MINI (and many other new cars), when you step on the throttle, it sends a command to the EMC and it sends a command to the servos in the throttle body and off you go. The throttle position is determined by a lot of input from engine sensors to reduce pollution and prevent damage from detonation. BMW is supposedly reprogramming the computer to eliminate or reduce the hard starting, so perhaps they will be able to correct the surging too. It will probably take them some time due to the number of sensors and the differences in brands and grades of gasoline.

Originally posted by peter_II


Drive with constant RPM at 2000 RPM in 2nd gear.
Then add throttel for smooth acceleration (about 1/3 throttle)

If it is as obvious as in my car you will start noticing at about 3000 and it will vanish shortly after 4000.


This is the clearest description of the problem I've read so. Short, clear, precise. Well done.

I've had a difficult time describing it the dealer, as my MCS has been doing it since it had 7 miles on her and continues to do it now with 2900 miles on her.

This will make things easier now as relating the problem will no longer be half the battle.

Christian

DITTO ME 2

700 miles on the clock, July 2002 Build but no cold start problems
hummmmm not sure what 2 do

Dave

BIG CHANGE.

I have 1300 mile on the clock now.

The car feels like a new car. It really opened up.
Its like the revs are going up faster...

For all those in the break in process, its really
interesting behind the 5000 Border.

Bevor I forget:

The YOYOOING is gone, it suddenly vanished (same time I recognized the extra power) just about 1244 miles.

Very happy now.

Like taking a second delivery.

Our car seems to have been fixed. The dealer had it for two days and found that the seals between the supercharger and the inlet manifold had not been fitted correctly. They showed me the faulty seals and it was clearly visable. This may lead to a recall (so they recon). the car is totally different.

MCS Pure silver Chilli spots white lights 17 inch wheels full leather auto air con CD boost MFSW.:D :D :D :D

Originally posted by Martin Plaskitt
Our car seems to have been fixed. The dealer had it for two days and found that the seals between the supercharger and the inlet manifold had not been fitted correctly. They showed me the faulty seals and it was clearly visable. This may lead to a recall (so they recon). the car is totally different.

MCS Pure silver Chilli spots white lights 17 inch wheels full leather auto air con CD boost MFSW.:D :D :D :D

Would it be possible to post the Service Slip from your dealer where they describe the problem and the solution. This would be helpful for me to bring to my dealer.

Thanks!

Christian

Sounds like a different problem. Snoopy has had the software update and the yoyo/surging effect has gone.

:confused:

Originally posted by Basil
Sounds like a different problem. Snoopy has had the software update and the yoyo/surging effect has gone.

:confused:

Basil, have you noticed anything with the fuel consumption after the software update? Did it take care of the hard starting in the morning?

Any noticeable change in performance? Thanks.

Originally posted by Basil
Sounds like a different problem. Snoopy has had the software update and the yoyo/surging effect has gone.

:confused:
hmm may be not. The temps as you know is finally starting to get warm (30 deg c) now Basil and this morning I had a little yoyo in 2 gear, BUT nowhere near as bad as it was. It is a very subtle yoyo and you have to know what you are looking for to feel it.

I will take the car out again when it gets colder tonight and see if it is still present.

benggolf

No great change in the fuel consumption. But the car is a lot better to drive. Faster and smoother when puling away from stop or really down low in the RPM range. Also starts first time every time, never started first time before, it all ways took 2 goes to get it going in the morning and it does not even get cold here i.e. 10 deg c is the lowest it has been since I have had the MINI.

Glad to hear all the positive notes on the ECU update.

Now to wait for the MINI Canada Regional Service Rep to show up at the dealership so they can do the software update on my car. They tell me maybe in about 1 month! :(

Originally posted by benggolf
Glad to hear all the positive notes on the ECU update.

Now to wait for the MINI Canada Regional Service Rep to show up at the dealership so they can do the software update on my car. They tell me maybe in about 1 month! :(

Yep well worth getting it done and making a pain of yourself to get it done. You guys need it more than we do (the cold start fix that is) as my MINI has to be parked for about 14 hours for the engine not feel warm or not show anything on the temp dial. Not like the weather you guys get over there. Oct was to cold for me and I keep getting told "this is not cold wait for NOV and Dec"

I've had the ECU upgrade for about a month now and have noticed a slight "yo-yo" feeling in second and third gear when accelerating quickly. It's not as bad as it was before the upgrade.

Fuel consumption seems to be normal. I've gotten between 24.4 and 32.9.

Yo-yoing here as well on the acceleration, seems to only happen while accelerating in 2nd gear around 3k rpms. Hope it doesn't get worse with miles currently have 2k on her.

I reported last week that the yo-yo fault had been fixed by replacing the seals on the supercharger. This has not been the case, the car feels better, however the fault is still there. Surely someone at Mini looks at this web site! Please be honest and let your customers know what is happening and how you intend to solve the problem. :confused: :confused: :confused: :confused: :mad: :mad: :mad:

I took delivery of my MCS on 9-21, it was an 8-15 build date. I have noticed the "yo-yoing" between the 2,500 - 4,000 rpm range in 2nd gear.
I hope it goes away as it has for peter_II.

Otherwise, it looks like a trip to the dealer for an ECU upgrade.

My software update was done last week. The yo-yo is still there. I never had a cold start problem but have always felt the yo-yo. I had hoped that the update would cure the problem but it is still there and feels exactly like before.
:(

Tom

Hmmm..... Took my S out for the first time in a week this morning. Started first time, and for the first 15 minutes (cold engine), absolutely none of the normal yo-yo sensation. Felt completely different. After the engine had warmed up, and in commuter traffic, the yoyo sensation was back with avengence.

Still awaiting feedback from my dealer on this issue.

:(

Just bumping this issue back to the top of the list. Anyone have any new news? Anyone had the problem "fixed". 1500 miles, still a problem for me.