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Direct Injection Proves Fuel Additives Dont Work

Recently I picked up a 2007 Mini Cooper S (R56) with direct injection. While doing other work on the engine, I decided to remove the intake to have a look at the intake valves. I found exactly what I expected, the valves were covered with performance robbing gunk.

I spent some time cleaning things up and it looks good as new now, but I have a feeling that one day this issue will come back again.

Why did this happen? 2 reasons. The first is direct injection. No fuel will ever make it to the back of the intake valve to clean it. Second, the N14 engine has a horrible PCV system. This means that the intake manifold is getting a constant supply of oily gunk that will eventually coat the intake valves again.

This is the foundation for my argument. If this car had a traditional injection system, the problem probably wouldn't be so bad.

I have other theories and explanations in the video. Please watch it, rate it kindly, and subscribe.

Check out my other channel for repair videos: https://www.youtube.com/user/EricTheCarGuy?sub_confirmation=1

Thanks for watching!

The best place for answers to your automotive questions:  http://www.ericthecarguy.com

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Discussion about this video: https://www.ericthecarguy.com/kunena/17-ETCG1-Video-Discussions/70311-direct-injection-proves-fuel-additives-don-t-work

My OTC Fuel Injector Cleaner: https://www.jbtoolsales.com/otc-tools-7448a-fuel-injection-cleaner-canister#oid=1002_1

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How Multi Stage Intakes Work:

The Mini Series Introduction:

2007-2013 Mini Cooper S (R56) Battery Replacement:

R56 Mini Carpet and Interior Removal:

R56 Mini Carpet and Interior Installation:

end faq



The #FairmontProject playlist: https://www.ericthecarguy.com/fairmont-videos

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