F22C1

Yay so it happened to my 1 yr old 06 with 6500 on the clock.

I'd like to know if anybody who's also has the case of the 'marblez' dyno'd to verify if it does or does not affect engine output?

If not then maybe we can rule out flapping & rattling auxiliary valves (would this symptom throw a CEL btw?).

Old Rotor

Marblez? What do you mean by that? MIAC(Marble In A Can) rotary-ping or detonation? Is that what you mean? It would happen if you use low octane gas and should go away if you use prem gas. It is loud and easy to hear. It would not do it if you accelerate slowly. If you get it when you floor-it and there is some loss of power then its MIAC-detonation.

F22C1

Yeah the infamous MIAC symptom.

How can I conclude whether it's fuel related or not because I've always used premium. I was using 76 for a few tanks and now I'm going to try to go back to Chevron. That and it's 40 degrees F out now so detonation seems unlikely? Did I get a bad tank of gas?

If it helps with anything I also happen to had an opportunity to test 3rd gear with an rsx-s with exhaust (that's as far as I can tell what he had) and in 3rd gear he was inching away... not saying this is a good baseline but it's something to think about.

Yes it is loud and audible from 7k to redline and back. I find it too coincidental that it occurs when s-dais switches over the aux valves too (I swear I hear the switch over and then the marbles ensue).

Accelerate slowly or fast I get the sound and I can hold it there too in neutral. Search and previous remedies so far just makes everybody more confused. Is it heater core or auxiliary valves or detonation...etc.

I want to know if there is a known fix... I'll bring it into the dealer eventually.

Soravia

I thought Wankel design and low compression reduces detonation even with low Octane fuel.

Marble In Can is for Nissan KA24DE with loose timing chain tensioner. lol

Juice

iTrader: (1)

Our compression is 10 to 1 which definitely isn't low

Soravia

I read that Mazada used rich fuel mixture in their wankel to reduce emissions.
I live in Florida, is there a way to make it less rich? I think fuel consumption damages the enviroment more than a hydrocarbon engine.

SlayerRX8

So you want to dyno your car, detonation and all? I wouldn't.

swoope

iTrader: (5)

tough call.

beers

AJ's Shinka

I heard this MIAC once when I used on base gas but I also had just topped of my coolant which I have read could cause the problem (bubbles). I've heard a good coolant flush or the heater core valve replacement can fix this.

I went back to Shell gas and never heard the Mad Marbles again, but I can't say for sure that this is the fix or it just went away on it's on. Sorry no help, but I too would like a definitive answer on this topic.

Old Rotor

If it does it in neutral too its not MIAC-detonation. I think you are hearing the coolant water. Does it sound like its under the dash, and like you are restricting the water in a garden hose? If it was MIAC then when you drove with your window open it would be much louder like shaking a marble in a coffee can. It's the sound of metal against metal.

F22C1

yes it is under the dash... like how everybody says behind the glove box area.

it sounds more like as if the front passenger wheel was driving over a sandy road and kicking up sand in the wheel well area. It could sound like the garden hose idea.

My concern is how come I never heard this before when it was brand new and now I have it? And it's not uncommon as other's have been plagued by it w/o a known fix.

So a coolant flush already?!! I checked my coolant reservoir when hot and it was at the full line. Worse yet possibly a new heater core valve?? This doesn't sound very reassuring in the long run then.

Footman

iTrader: (2)

I use Shell V-Power only ever since I got the car 2 months ago. '07 model GT. It had MIAC sound coming from the glove box ever since the break in period was over and I went up in those RPM ranges.

No solution

muythaibxr

If it's under the dash, it's coolant in the heater core... mine does that on occasion too. That's not really the Marbles problem; IMO it sounds like there's air in the coolant system to me... I've got an '07 sport that I bought in September, and it started happening to me when I first started using the heater.

Ken

voodootrip

or throw out if coming from tranny area when in neutral ... which is common in these cars

Juggernaut9

Quote:yes it is under the dash... like how everybody says behind the glove box area.


That is where the heater line comes in to the car. My 06' started doing this at about the same milage. It is caused by the water pump at high RPM making bubbles in the fluid. Mazda knows about this issue and has a TSB to place a restrictor valve outside the firewall to slow the flow down. I had this done about 8 months ago. No more marbles. But it might take a little while to fully go away unless they flush the radiator. Good luck.

Quote:If it's under the dash, it's coolant in the heater core... mine does that on occasion too. That's not really the Marbles problem; IMO it sounds like there's air in the coolant system to me... I've got an '07 sport that I bought in September, and it started happening to me when I first started using the heater.

Oh, but it is the problem......

F22C1

Sooo there is a TSB for the heater core? Ahhh... at least were getting somewhere finally.

Assuming that this is my 'fix', can I just go up to Mazda and say, "here check this out" and then tell them to put in that valve per TSB-something something something. Will it go over that easy? Or should I call and make an appt?

Will they also do a coolant flush for me while their at it (if the sound doesn't initially go away)?

I'm still at a loss why the sounds happen for some cars and not for others. Why wasn't there before and here now. What's changed?

Are you saying that some systems develop more vapor than others (frequent redliners) and thus over time it makes it's way to the heater core where it cannot be removed or bled out?

Juggernaut9

Tell them about your issue (they will verify). Then they will make an apointment for you and fix it. I researched it before i took mine in and they said it was this & that even tho I told them about the restrictor valve. But after they checked my heat shields & called Mazda they came back and said "you are correct" and put on the restrictor valve. I'm not sure why it didn't happen till I got to a certain milage.

Yes, it can be flushed out but it will come back without the restrictor valve.

Soravia

One way I got air out of my Nissan heater core is by having the car idle for 10 minutes on a parking lot in front of AutoZone. The car was parked with head up.

When I pulled out and headed back to the warehouse the car started over heating and I found out I was suddenly low on coolant.
But at least I can finally use the heater now.

sheltbh

well im having this same problem so should they replace the coil or the restrictor valve,,, and what is TSB? The shop guy said he was ordering the heater coil about three or four weeks ago but says it on backorder for redesign? could someone verify this?

4me2

https://www.rx8club.com/rx-8-discussion-3/no-more-detonation-%2Amiac%2A-121249/