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Not a stupid question, I've considered that, but I'm concerned brass could do damage and it might be hard to get full coverage. Also, you need to be extra careful you don't lose any bristles down there. For whatever reason, the preferred way of you aren't using a walnut blaster is using a...

Wow! That's a lot of good info. Thanks! Maybe I'll just do the media blast... Any reason you didn't get the walnuts from HF, I think it's $25 for 25 lbs. The manifold looks like this: https://ebay.us/m/sgeFpH So I guess the best way to describe the ports is a rectangle with different...

Thanks for all the feedback, couple points: 1) Everything I've read is sucking things in through the intake is ineffective and I have no way to verify the results, so I'm committed to removing the intake and mechanically removing deposits. That way I know it's clean and eliminates that as a...

I have a 2015 Mazda 3 2l Skyactiv-G engine, and I'm thinking it might be best to remove the intake manifold and clean the intake valves. Over the past 120k miles, fuel economy (as shown by the infotainment system) has probably decreased by 5-10%. I was planning to remove the deposits using the...