RX-8 Rotary decarb part 1

Decided at 25,000 miles, it was time for a decarb. Used seafoam rather than Mazda's cleaner. I placed two tubes in the can of seafoam, and ran each line to a separate vacuum port, so I could do both rotors at the same time rather than separately. After sucking up all the seafoam, let it sit for a little over an hour. Then I put a cup of Idemitsu in the empty seafoam can, used the two tubes again, to help lube the rotary chambers during initial startup.

Afterwards, low end torque seems improved, and throttle response is way up, most notably when starting out from a stop. No bogging down, other than when I clutch poorly ;). Idle is PERFECT. While idling, there's no vibration from the engine whatsoever. Like new.

And as expected, the check engine light came on afterwards, and stayed on for about a day before going out.

Category:

Autos & Vehicles

Tags:

• RX-8
• RX8
• rotary
• decarb
• rotor
• engine
• mazda

[Ferrariman601]

Am I wrong in the assumption, but can't this seriously damage your catalytic converters?

I don't have an RX8, so please cut me some slack. :\

[iomag]

@Ferrariman601 Yeah it can... :) The key word there is "can". Doesn't mean it will, just that there's a risk of it occurring. I've only done it once, at around 25M miles, which was 10,000 miles ago, and I haven't had any cat problems.

[bludika]

hey man, nice rx8, i own a late 2004 black rx8 gt, and i've been wanting to seafoam my car as well, but I can't seem to find a very good DIY on it for rx8. Is it possible you can tell me how to seafoam my rx8? Or if you got it off from a website you can possibly message me the link? thaks

[iomag]

@bludika Hey thanks, almost got a black myself, but I wanted the keyless entry and keyless start :P 2006 was the first year they added that, and lo and behold, a brand spankin new 2006 VR RX-8 on the dealer lot called to me. :D

There's a big thread about decarbing on RX8Club.com, but youtube isn't letting me post the link right now. Search there using "seafoam". I'll email you the link too.

[rbrtp]

I have an 04 rx8. Did u put something in the gas ti cause that

[iomag]

@rbrtp To cause what? The smoke? That's just the carbon deposits that the Seaform broke down that are buring off.

[7coldfusion]

nice job covering ur plates LOL



[free2speedje]

Also, I wouldnt rev the engine too high when doing that during the initial process, Ive herd storys of engine problems and component burnouts..just my 2cents

[free2speedje]

Hahaha I think I herd a lil kid coughing from the smoke.....can someone say child services???

LMAO j/p

[oinkurrboinkurr]

holy crap. the first time you started it up, it was just black smoke

[fart383]

@bludika if you want to decarb the shutter valve and such look at the intake manifold. you will see to tits with rubber plugs on them. that is where you inject the mazda cleaner or what have you into the rotors. the procedure is you crank the motor with your foot floored to shut off the injectors while injecting the cleaner at the same time and thats it. and by the way that smoke is nothing when you deflood an rx8

[bludika]

@iomag k i got your link, it seems pretty long, is it hard to do even if you follow the guide? i'm not experienced with under the hood maintenance other than changing the air filter and oils or fluids.