Exessive carbon build-up
 

I live in Atlantic Canada. Less then 5000 Km ago I had the injectors change under good will of Mazda since nothing is wrong with the injector themselve. Mazda says it additives in the gas for Atlantic Canada that makes the carbon stick to the injector and will cause them to leak. The car ran good for about 3000 Km and now I'am starting to feel the same symptoms as before. Weak throttle response, afterfire between shifts, unstable LTFT's, plumes of black smoke and I can feel some misfire when the car is cold.

I used Seafoam the day after they changed the injector to start fresh. The dealer told me the use intank fuel systeme cleaner and carbon cleaner. What would be a quality product to use and what should I stay away form???

And for the curious here is my tune.

Thanks for the help!!

I shoot black puffs of smoke out of my car. Its pretty normal really on these cars they soot like a diesel but not as much lol.

I would imagine the lack of performance is more from carbon buildup around the intake valves. Do you have a catch can or egr delete?

No I don't they are on my list of new parts for when my tax return get here. For now I guess I'm gonna get some seafoam for the tank and motor oil.. How often can I do the combustion chamber with seafoam??

Idk I do it about every other oil change and I only do mine through the vaccum lines.

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Slick 50 or seafoam in gas tank are what we have always used. Granted we've always used them on a PI vehicle but i dont see why they wouldnt work just as well on a DI injector :/ maybe see what some of the diesel guys use, the fuel is different but the injectors are more closely related.

I think running seafoam through the vaccum line will hit the intake valves. Which is why that's recommended.

I have seen some threads that don't reccomend using any fuel additives with exception to seafoam. OP there is a how to on sea foaming these cars I would search and find it should help u

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yeah the procedures for seafoam per Seafoam are:
1/3 in brake booster to hit valves (doesn't do much, the little spritzing isn't enough to break the hard carbon)
1/3 in gas tank (to clean injectors)
1/3 in oil to clean and maintain seals.

It is best to do this no more than 500 miles before your next oil change, as the seafoam does have a tendency to degrade the oil, and all the crap it does clean out will need to be flushed.

Thanks guys! I have used the method explained on this site and found that it worked good. I was just asking how often you guys do it. I might have to poor some in the gas tank every 5-10 fillups and through the intake every 2nd oil change this stuff is very cheap compared to 2kish$ for injectors. And I'm ordering the EGR delete tonight...

I swapped my intake manifold out 2k ago, at 33k, and did the egr delete. Ive never seafoamed my speed. When @dantes5823; and me pulled my manifold, I looked at my valves and those bitches were clean. I had only been spraying meth for 5k prior to that.

What I've been doing since day one of owning this speed is everyday, I do at least one wot pull, and before I park it, I will rip thru 2nd just to clean out any shit in there. Worked so far for me.

Use b12 in the tank. just follow THOSE directions for intank.

I was doing SF every 1k miles until the carbon subsided and now I only do it right b4 an oil change. I have 120K on my car now.

I have found using the port on the IM (blue clip) is working better than the BB. To each their own.

Chevron Techron Complete Gel system cleaner ungunks EGR's. Try that.

When he says clean, he means like you would swear the car had like 4k on it. No egr or OCC prior to that day.

Thanks evryone! I just got my EGR block off plate today and gonna put it in this weekend. The oil catch can and meth injection for this summer. The seafoam in the gas tank seems to work good the fist time I put it in the car ran like it did when the car was brand new. Thanks again..

How do you control the flow of SF into the vacuum line? Liquid doesn't compress so too much at once would not be cool.

On the IM vac line I connect a foot of hose to it.

Slowly pour it in.... if you watch closely when pouring it doesn't just POUR into the line. Takes a good 2-3 mins to get thru a 1/2 bottle.

I know the RX8 guys use a "drip feed" line.... I believe the Mazda Zoom cleaner kit includes this, but I've never used it personally.