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Hesitation Under Hard Acceleration

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Hesitation Under Hard Acceleration

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  #1  
Old 08-12-2018, 09:21 AM
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Hesitation Under Hard Acceleration

We've owned our 2013 Cooper Paceman S All4 for 2 months now.

It had 50,000kms when we picked it up. I noticed while driving it in higher gears and hard accelerating there is hesitation from the engine. Worse if you hit a slight hill. Noticeable between 2 - 3k rpm.

I replaced the spark plugs. I installed some NGK Platinum 90223 plugs which were the ones that the auto retailer said were recommended.

The hesitation is still there and now after a lot of reading on here i'm paranoid about the plugs. Should I have installed the 95770 irridium plugs instead?

I'm also wondering if its an issue with a coil or carbon build up. I'm not getting any misfiring but its really annoying when you accelerate and it feels like it skips a beat erratically.

Basically looking for an answer about the plugs, which is best to fit?

Any help is much appreciated.
 
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Old 08-14-2018, 04:27 PM
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I had a stumble around that RPM under hard accel. I pushed the car harder to trigger the CEL. Its a misfire you have, I lost coil 1 . As far as the plugs go, I selected my car at my brothers shop PC to order parts and it gave me Iridium plugs.

Do you have a CEL ?
 
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Old 08-14-2018, 04:35 PM
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I haven’t had a CEL yet. Kinda hoping it does so I can at least track down what might be causing it.

The other thing about the plugs is the gap. I asked the guy in the store where I got them from what the gap was set at and he said they come preset at 0.26. I’m wondering if this is too low. I keep reading it should be 0.32.

If a coil is intermittently failing under hard acceleration how is it possible to diagnose which one?
 
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Old 08-27-2018, 06:30 PM
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You have to push to stumble and stick with it. I just got another coil pop as bad. She gave a code the other day, I cleared it. Today I got on her to trigger the light just before I got to my brothers shop and but I couldnt.
I have OEM coils coming.
 
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Old 08-28-2018, 08:18 AM
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I'm dealing with the same thing on my 2012 Countryman and my wife's 2010 Clubman. I was getting some stumbling last year, so I replaced the plugs and coils in both, and it went away. Then we moved from Florida to New Mexico and they're doing it again. I didn't buy OEM parts, so maybe that's the problem. I have 4 OEM plugs that I'm planning to install this weekend, and if that doesn't help I'll order OEM coils. If that doesn't help, I don't know, I might just live with it.

Anyway, try replacing the coils if you haven't yet. Just replace all 4, they're not that expensive.
 
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Old 08-28-2018, 10:33 AM
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I would use only the OEM plugs and coils if you replace them. Don’t go cheap or with a “better” aftermarket plug. From personal experience, the OEM work the best. If you are tuned you should use NGK 1422’s, otherwise use the same thing that was in there.
Im sure others have done the same thing, but after I first got my R60, I decided that I should change the plugs and coils, so I found what looked like some good performance ones and bought them. After installing them the car bucked and misfired really bad under load. The OEM is best. Switched to new OEM coils and Beru plugs and it ran like brand new. I don’t know exactly why, but these things are very finicky about these parts.
 
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Old 08-28-2018, 03:10 PM
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Im running Denso Iridium plugs and delphi coils. Delphi makes the coils for Mini. But I decided to order 4 from minipartsdirect.com best price I could find. If they have the same number as the Delphi's I have now it doesnt matter OEM or not.

I have say less then 10k miles I on them .
 
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Old 08-28-2018, 04:45 PM
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Originally Posted by Mrshooby View Post
We've owned our 2013 Cooper Paceman S All4 for 2 months now.

It had 50,000kms when we picked it up. I noticed while driving it in higher gears and hard accelerating there is hesitation from the engine. Worse if you hit a slight hill. Noticeable between 2 - 3k rpm.

I replaced the spark plugs. I installed some NGK Platinum 90223 plugs which were the ones that the auto retailer said were recommended.

The hesitation is still there and now after a lot of reading on here i'm paranoid about the plugs. Should I have installed the 95770 irridium plugs instead?

I'm also wondering if its an issue with a coil or carbon build up. I'm not getting any misfiring but its really annoying when you accelerate and it feels like it skips a beat erratically.

Basically looking for an answer about the plugs, which is best to fit?

Any help is much appreciated.
It could be so many things with these newer prince engines. Doubt carbon build up though. You have newer design.

Could be a fuel pump issue, ( high pressure or low - I think theres an extended warranty for HPFP ) could be air sensor issue, could be bad coil, could even be issue with Turbo.

Meantime, while you spend $$$$ throwing parts at a problem which doesnt go away, you could just go to the dealer, have it diagnosed properly and get it over with...
 
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Old 08-28-2018, 06:14 PM
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Originally Posted by Eurothrasher View Post
It could be so many things with these newer prince engines. Doubt carbon build up though. You have newer design.

Could be a fuel pump issue, ( high pressure or low - I think theres an extended warranty for HPFP ) could be air sensor issue, could be bad coil, could even be issue with Turbo.

Meantime, while you spend $$$$ throwing parts at a problem which doesnt go away, you could just go to the dealer, have it diagnosed properly and get it over with...
Yeah, but anyone can do that! Better to throw money and unnecessary parts at it! Lol.... just joking around.
You're right though, there are so many different reasons for it. I had weird issues that seemed unrelated when my turbo wastegate was toast. On that note, I had a severe misfire and bucking under hard acceleration and would go right into limp mode on me right after I replaced the turbo. Turned out that it was WAY overboosting and hitting the fuel/boost cut-off.
 
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Old 08-28-2018, 06:16 PM
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Originally Posted by Jorge Perez View Post
Im running Denso Iridium plugs and delphi coils. Delphi makes the coils for Mini. But I decided to order 4 from minipartsdirect.com best price I could find. If they have the same number as the Delphi's I have now it doesnt matter OEM or not.

I have say less then 10k miles I on them .
Same here, you can buy them from Delphi with the same part # for half the price, the only difference is that it doesn’t also have MINI molded into the plastic as well. That logo isn’t cheap!
 
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Old 08-30-2018, 03:38 PM
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what oil are you using and do you know what its flash point is? i am asking this because it might be just bad oil, burning at operating temps and decreasing the octane rating of the gas.
 
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Old 08-31-2018, 05:00 PM
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Mobil1 0w40 euro I had LiquiMoly before than Castrol Titanium before that, before that Mobil1 0w40 without smoking .LM and C smoked and C died at 3000miles.
Today my Mini OEM coils came in at 55bucks per. Totally different look compared to the Delphi aftermarket coils. I pulled a plug and ran the number, turns out the parts supplier sent the wrong plugs. The Denso plugs were for a Toyota.
New NGK plugs gapped at the proper .26 thats called for my engine as opposed to the .42 plugs Denso had listed

I drove home in S mode and beat the snot out of her. No misfire
 
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Old 09-03-2018, 04:31 PM
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So, after more driving the initial problem that i described as hesitation under hard acceleration is more like hesitation in higher gears even with just lightly accelerating. 1st and 2nd gears it pulls really hard but once you are up over 50mph acceleration is not smooth. the hesitation is random though and i'm not getting any CEL. I kinda wish I would that way I would have something to show for it.

In sport mode the hesitation is slightly reduced/

Any ideas or previous experiences or where to look next?
 

Last edited by Mrshooby; 09-03-2018 at 04:34 PM. Reason: Addition of symptoms
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Old 09-14-2018, 11:42 AM
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Originally Posted by Mrshooby View Post
Any ideas or previous experiences or where to look next?
Did you ever replace the coils? My money is on coils.

I replaced the spark plugs and coils on both my R60 and my wife's R55 this morning with OEM parts vs what I had purchased previously. I didn't have any issues when I drove mine to lunch, but it's too early to say whether it fixed the problem. It typically doesn't do it much in the mornings when it's still cool out.
 
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