Has anyone done an induction service? - Unofficial Honda FIT Forums


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Old 03-09-2018, 02:26 AM
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Has anyone done an induction service for chemically cleaning their intake valves?

Anyone tried cleaning their intake valves with chemicals through the intake? (Stuff like BG, CRC, Sea Foam etc)
I'm worried about the longevity of the intake valves but I've also read that doing this sort of service can cause carbon chunks to scour the cylinder walls or even end up in the catalytic converter.
Ideally, I would have used something like this from the get-go as preventative maintenance but I'm at 45k miles; not sure if it would be a bad idea being this far along.
Thoughts?

Last edited by Gekisen; 03-09-2018 at 10:17 AM. Reason: More specific title
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Old 03-09-2018, 03:32 AM
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If you have build up to the point where you could actually have "chunks" break off... the first thing you need to do, get better gas.

A decent gas station has gas that has "detergents" mixed in. That alone should be preventive measure against that much build up.

At 45k miles with anything other than total crap gas isn't going to get enough of anything inside to worry about.

As for stuff like Seafoam or whatever, I don't know... never tried the stuff. I have 136k miles and so far, haven't encounter a reason to use those products.
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Old 03-09-2018, 10:16 AM
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Originally Posted by Goobers View Post
If you have build up to the point where you could actually have "chunks" break off... the first thing you need to do, get better gas.

A decent gas station has gas that has "detergents" mixed in. That alone should be preventive measure against that much build up.

At 45k miles with anything other than total crap gas isn't going to get enough of anything inside to worry about.

As for stuff like Seafoam or whatever, I don't know... never tried the stuff. I have 136k miles and so far, haven't encounter a reason to use those products.
Wow you already have that many miles on your GK? That's a relief to know. I take it that most people who've had problems with hardened carbon chunks coming off, probably started those services when they already had trouble. I think you're right about the gas. I've only ever used Top-Tier. Anywho, what piqued my interest in cleaning the intake valves was when my car was new, I managed to get 45mpg over a thousand mile stretch. Lately, I haven't been able to pass 45mpg on the meter while cruising. In the past, cruising would net me 47mpg+ on the meter. Earlier this week, I poured a bottle of Techron into the tank, kept the RPM high for at least a half hour and I was seeing the old numbers again. The problem with fuel additives though is that they supposedly do nothing for the intake valves.

Last edited by Gekisen; 03-09-2018 at 11:37 PM. Reason: Grammar, more specifics
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Old 03-09-2018, 02:17 PM
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Goobers above has a GE, so no carbon fouling concerns like you have.

I've done Seafoam on other cars with decent results. My opinion is that you either want to start doing induction cleaning early on (you're still in time) or not at all. That avoids the likelihood of large amounts accumulating which avoids the possibility of chunks. In other words, I agree with your concerns, but think you are early enough.

Amsoil makes a product called Power Foam that I've read good reviews on. I like that it's a foam so that it can, in theory, sit and dissolve better than a pure liquid like Seafoam.

If you give this a go, let us know the results.
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Old 03-16-2018, 12:19 AM
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I was going to try it right before getting an oil change but honestly, I've never worked on a car before. I have no problem removing the top of the air box but the whole assembly is clamped and bolted down in all these spots that are too intimidating for me to deal with. I asked my mechanic if he could help me with it and he assured me that induction cleaning the intake valves are completely unnecessary on modern GDI engines. He says all you need to do is run two tanks of premium fuel through it.
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Old 04-08-2018, 01:38 PM
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Since the back sides of the intake valves never see the gas (it's injected directly into the cylinders), how can fuel "quality" make any difference?
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Old 04-09-2018, 07:56 AM
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Since the back sides of the intake valves never see the gas (it's injected directly into the cylinders), how can fuel "quality" make any difference?

This is a bit controversial, NOTE that I'm just repeating what I read on other Forums.



Because of potential carbon buildup, one design feature that many manufacturers use is to spray the DI 'horizontally' across the top of the cylinder. Their hope (?) is that when the valves open, the valves will be in the path of the spray.

Valves are supposed to rotate a bit as they open so spraying one side is OK.

So, the use of High Detergent gasoline (Top-Tier) is recommended to reduce buildup.

By the same process, the use of Premium gas is supposed to help also, as it 'encourages' the ECU to spray the gasoline earlier (less danger of pre-ignition with 93 octane).



Obviously these steps are not a cure-all. Some manufacturers are starting to include supplemental port injectors to to aid in the dispersal/prevention of carbon.


I think it will be a few years/development cycles before we get a GDI system that is as reliable as port injection. (But only if GDI engines are not banned because of the particulates they produce.) <SIGH>
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Old 04-14-2018, 07:51 PM
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Can't you just take off the airbox, spray the foam in with the throttle open (and the engine off!) then run it?
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Old 04-15-2018, 11:22 PM
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Since the back sides of the intake valves never see the gas (it's injected directly into the cylinders), how can fuel "quality" make any difference?
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