[Cosmic73]

Hi, hoping someone can help. I have an 08 Cooper S.
I have recently had the following happen whilst driving on motorway at steady speed.
Cruise Control Failure light came on on dash followed instantly by loss of throttle response & check engine light.
Got it onto hard shoulder & got recovered.
Codes showing are P2103, P1637 & P1638 which all seem to be related to throttle valve.
Engine has been apart with new rings, timing chain, deoke etc etc & has no carbon build up at all.
If I switch it off for 10 mins say then I can drive it fine for 30 secs, maybe a minute or 2 but then throttle does the same thing & just doesn't rev up, only stutters to approx 2000rpm.
Engine hunts wildy on tickover too.
It did the same thing a few months ago but without showing the codes only the crusie control failure light(cruise control wasn't on on either occassion) & check engine light.
Switched it off for 10/15 mins & then it was fine & has been until the other day when it did it again about 100 miles into a trip but now with the 3 fault codes.
Basically what I wanted advice on was do I change the throttle body & go from there or is there something else more likely to be causing the fault ?
here's hoping you guys can help me, thanks.

This is happening to my engine with similar codes and is worse on hot days.
I'm thinking the after market catch can may be the problem, the blue pipe is really thin and really stretches when hot.
Tomorrow I'll remove the catch can pipes and route the breather direct again into the intake pipe, fingers crossed.

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[Cosmic73]

Ah, I thought those pipes were under pressure, but if under vacuum of course they'll cave in. It's obvious now. Thanks for pointing that out.
Btw, I've ordered a can of seafoam so I'll give the entire intake a good clean out too.
Cheers Mike, so glad your back on the forum 🚗

 

[Cosmic73]

At least with mini cooper there's always something to fix!
I've just connected the breather direct into intake, went for a spin and the same fault codes appeared straight away, bollocks!
I'm hoping this seafoam treatment is the dogs bollocks because I'm spending a fortune on this heap of shite, just one thing after another. 😭

 

[Cosmic73]

It's definitely not the head because it was professionally stripped and cleaned then skimmed and rebuilt with new guides and seals.

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[Cosmic73]

Give it the seafoam treatment and a reassuring amount of smoke billowed out the exhaust!
Took it for a spin and the same thing happens.
Half engine light pops up a few times then this symbol which goes into limp home.

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Same error codes p1638, 1637 & 2102.
Will a 2nd hand throttle likely to sort this out?

 

[Cosmic73]

Yes it's cruise control and as far as I'm aware is linked to the electronic throttle.
There's some cheap 2nd hand ones in eBay for £20 and it's an easy fix so I'll see how that goes.

 

[Cosmic73]

Eventually managed to remove the inlet manifold>throttle in about 2 hours with that bastard bolt taking an hour of it!
Anyway, throttle is minging so God knows what it was like before the seafoam;

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One removed I also spotted a crack in the manifold!

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So, is the crack or throttle at fault? Or should I hedge my bets and just replace both?

 

[Cosmic73]

I'm glad I did remove manifold because I never would have spotted that crack otherwise.

 

[Cosmic73]

Also, my throttle has part number V757669880.
There's loads for sale, all from R56 cooper S but slightly different part numbers but look identical.
Do you know why the part numbers are different?

 

[Cosmic73]

The 2nd hand inlet manifold arrived today and that also has a crack in exactly the same place! 😣

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[Cosmic73]

It may have been at some time but it's definitely opened up into a crack.
Interesting to find out if you have the same and it's weak point or it really is normal and just part of the moulding.

 

[Cosmic73]

Well, another used manifold arrived today and that has exactly the same crack in exactly the same position.
Now I'm either really unlucky or it's part of moulding and just looks like a crack.
I don't think I've got much choice but to refit my original manifold but with a different throttle.

 

[Cosmic73]

Have you had a chance to look at yours yet?

 

[Cosmic73]

I filled in the crack with some sealant, fitted the new throttle, spent an hour putting that twat bolt back, cleared the codes and took it for a spin.
Drove like a dream, no codes, no hesitation, spot on.
Such a relief. Looks like it was a faulty throttle after all.
Anyway, the bitch of a car is getting sold!