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Old Jan 22nd, 2013, 10:37 AM
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Carbon test

Cooper s in with mini with jerking problems and back firing. Under warranty but they want 140 to test it omg this car is costing too much.
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Old Jan 25th, 2013, 11:21 PM
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You can try something to help loosen the carbon and may save you some cash.

1. What you do is get the engine nice & hot.
2. Take the vent pipe off near the turbo intake.
3. Spray water into the intake where the vent pipe usually connects, not to much, just use an atomiser or something that restricts the amount going in. You may need a friend to assist keeping the engine revs up. Do this for about 15 mins, using about a litre of water.
4. Put the vent pipe back on & take the car for a spin & give it an Italian service.
5. Repeat step 2-3
6. Take the car for another spin & see if it has helped.

There is lots of info about water de-coke on the internet.

Tab

Quote: Originally Posted by morgs18 (original)
Cooper s in with mini with jerking problems and back firing. Under warranty but they want 140 to test it omg this car is costing too much.

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Old Jan 26th, 2013, 08:10 AM
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I have heard 50/50 reviews on water de-coke, half where professionals know what they are doing and get a good job done very carefully, the other half where people ruin the engine from doing it wrong.
Personally I just use BG 44K and if the exhaust turns black with carbon then you know there is a build up and you can repeat the use of this after 5k miles if it is was, you should notice improved when using the first application.
There is always the worry that you may dislodge a large chunk of carbon so you want to use something that will break it down good.
I have used it at every 10k, usually when I start to notice the odd misfire and then boom everything back to normal once I clean the exhaust back to shiny
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Old Jan 26th, 2013, 01:19 PM
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Seems a bit out of order to me, charging you when
you vehicle is still under the warranty.
But hey, that's BMW for you!
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Old Jan 26th, 2013, 07:18 PM
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Quote: Originally Posted by karlos9191 (original)
I just use BG 44K

no point,it won't clean the inlet valves on the n14 engine(Coop S),it's a direct injection engine,so NO fuel additive will clean the valves as there is NO injector wash..
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Old Jan 26th, 2013, 09:15 PM
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Guess the only option to take them out and use your Braun electric toothbrush to clean everything. Pain in the bum hole really!
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Old Jan 27th, 2013, 05:53 PM
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Thank you all but its been sorted although I nearly had heart attack when I was told the engine needed de coking and they wanted 1300 pounds. But luckily the nice ppl at BMW agreed to make a good will gesture and cover the costs. One happy mum and relieved daughter
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Old Jan 27th, 2013, 06:11 PM
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Quote: Originally Posted by morgs18 (original)
Thank you all but its been sorted although I nearly had heart attack when I was told the engine needed de coking and they wanted 1300 pounds. But luckily the nice ppl at BMW agreed to make a good will gesture and cover the costs. One happy mum and relieved daughter

Good to hear but what about the next time it needs to be de-coked?
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