2013 R57 Mini Cooper S Hesitation & Misfire
Discussion
I have a 2013 R57 Mini Cooper S with the N18 engine. Has 55K on it. Always been regularly serviced with oil changes done every 7K ish or less.
I have 2 symptoms:
1. When pulling away immediately after a cold start, it hesitates slightly.
2. Sometimes at a hot idle in traffic, the revs drop slightly and it appears to misfire a little.
No engine codes logged on Bimmerlink.
Looking for likely causes, carbon build up on the valves, High pressure fuel pump, or an air leak seem possible causes.
So:
1. Do these engines generally need a decoke at 55K? Google says 50 to 70K is the window when they tend to need it
2. Is this a likely cause of the issue?
3. Are there any other likely causes
Thank you.
I have 2 symptoms:
1. When pulling away immediately after a cold start, it hesitates slightly.
2. Sometimes at a hot idle in traffic, the revs drop slightly and it appears to misfire a little.
No engine codes logged on Bimmerlink.
Looking for likely causes, carbon build up on the valves, High pressure fuel pump, or an air leak seem possible causes.
So:
1. Do these engines generally need a decoke at 55K? Google says 50 to 70K is the window when they tend to need it
2. Is this a likely cause of the issue?
3. Are there any other likely causes
Thank you.
AFAIK they DO need a decoke/walnut blast & 70k is normal, although the effects can be discerned before then.
You can obviously check yourself for metered air leaks yourself to rule that out first.
If there are no visible issues it could be worth booking it in for a walnut blast & get them to do a compression check at the same time along with a new set of plugs if they haven't been changed for a while.
You can obviously check yourself for metered air leaks yourself to rule that out first.
If there are no visible issues it could be worth booking it in for a walnut blast & get them to do a compression check at the same time along with a new set of plugs if they haven't been changed for a while.
Yes, I was thinking 55K seems low for a decoke, especially since it has always had very frequent oil changes - longest ever oil change was the first one and that was only 9615 miles, the rest are all quite a bit lower.
Is there a trusted/recommended mini specialist in NE Hants I could take it too? I'm generally very hands on (used to be fairly well known on the C5 RS6 forums) but I'm not trying to make the mini a project car, I have other projects I'd rather work on.
Is there a trusted/recommended mini specialist in NE Hants I could take it too? I'm generally very hands on (used to be fairly well known on the C5 RS6 forums) but I'm not trying to make the mini a project car, I have other projects I'd rather work on.
I'm am sure if I didn't service it enough that coking and timing chain wear would be worse. And I find the condition based indicator suggesting up 22K miles between services is bonkers
Anyway, easy to find lots of places on google that'll just plug it in, look for error codes and tell me I need to regass the aircon (the only error it currently has), but was hoping for some recommendations of people that really "know" these cars. On my old C5 RS6, there were only a couple of places in the country, so I made the effort to learn the ins and outs of the cars myself and wrote many How To guides, but trying to avoid making the mini a project, I already have a proper project car that needs some love.
Anyway, easy to find lots of places on google that'll just plug it in, look for error codes and tell me I need to regass the aircon (the only error it currently has), but was hoping for some recommendations of people that really "know" these cars. On my old C5 RS6, there were only a couple of places in the country, so I made the effort to learn the ins and outs of the cars myself and wrote many How To guides, but trying to avoid making the mini a project, I already have a proper project car that needs some love.
The intermittent nature of the problem sounds more like something fuel, spark or sensor related to me. Worth chucking on some cheap coil packs first? Perhaps just buy one or two and swap them out one/two at a time to see if the issue goes away? My R56 JCW didn't chuck a code when one of my packs was on the blink.
Kevin-y9fs3 said:
So you think he needs to get his engine de-coked before trying a more likely solution?
Ok.
Thanks for your helpful input. I'm sure the OP appreciated it.
I suspect it would be a bit more helpful that "something in the engine bay" which is basically what you said.Ok.
Thanks for your helpful input. I'm sure the OP appreciated it.
Apart from that, I didn't say that his engine needs a decoke, I said those engines can benefit from one over 70K.
But if you want to willy-nilly load up & fire the parts cannon at things "fuel, spark or sensor related" knock yourself out.
Pretty much the only thing that doesn't come under "fuel, spark or sensor" would be the actual short-engine itself.
Edited by E-bmw on Wednesday 14th January 14:23
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