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      01-26-2013, 10:58 AM   #19
Eelesy24
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Drives: 2006 E90 325i M Sport Manual
Join Date: Sep 2012
Location: South East

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The throttle is used more than just as a back up, it is used on cold start and also at other times when vacuum is required.

At cold start is when the build up is most likely to happen because the engine is not hot enough to completely burn it
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2006 E90 325i M Sport SGM, BMW performance kidney grills, M3 lip spoiler, BMW performance air filter, BMW Darkline Rear Lights, H&R sport springs, Backbox delete, 18x8.5 Rota Grid Drifts in Hyper Black
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