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RX8 Hard Idle? O2 Sensors?
Submitted by JrGman7765 on Sunday, January 9, 2005 - 11:49am

I've got about 8800 miles on my 8 and about 2 weeks ago decided to add some octane booster to it. After I ran the tank dry I started to get this hard idle and "putter" from the exhaust. At times it feels like its about to stall out. Logically, I thought the octane booster was the problem. The dealer said "its normal." I disagree. Prior to adding the stuff, my 8 was barely audible it ran so smooth. Now, it sounds like a Harley. Could one application of the "cat safe, wont harm o2 sensor" octane booster I added produce this kind of problem? If so, what are some remedies other than new sensors...?

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Take it to another dealer...
February 10, 2005 - 11:47am
If possible take it to another dealer, because something isn't right with your car. You have a Warranty for a reason. If they will not honor it, demand to take it to the District Manager.

Next try contact them through the website
If that doesn't work, Call 1-800-222-5500

Best yet, send a snail mail LETTER!! You will be amazed how much more response you get from a letter.

Mazda North American Operations
P.O. Box 19734
Irvine, CA 92623-9734
Attn: Customer Assistance Center

I'm sick of hearing about shotty dealers treating customers like we own Yugos. The new Mazda president said he would shape up the dealer network, well, looks like things are no different from a few years ago.
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Hard Idle
January 22, 2005 - 7:47am
My RX-8 has had the sputter from new. I have taken it to the dealer 4 times for this. It now has approx. 9000 miles. The dealer has done 3 software updates and the problem still exists. Yesterday, the service manager said it must be "something that just happens with the rotary engine". I find this hard to believe.
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I've noticed the "sputter" yo
January 10, 2005 - 7:02pm
I've noticed the "sputter" you're talking about as well. At first, it scared the living daylights out of me and my dad commented on it being a rough idle. But, I believe it's because of the low-torque at low rev inherent in rotaries. One thing comes to mind though, Mazda sent out a recall notice for a fix on the PCM because of the cold-weather startup problem. I noticed your car has 8,000 or so miles on it, so this fix could've been already done, I'm not sure. I've got 15,000 or so on mine. Maybe it's related? I don't know. Update for 1/11: Unless I'm mistaken, you're not supposed to have any additives, in the oil, gas, or any other way possible (probably none, that'll hurt at least) in the RX-8. My rough idle has just stopped since I last posted. Mine never ran like a Harley as you're describing though. Another thing to consider is whether you were rough or not with the break-in period. Did you high-rev too long during the first 1,000 miles or so? Did you run it too long without oil? I just noticed that it may seem I were talking down to you, don't take offense, I'm just trying to help diagnose a problem. Good luck with all of this and keep us updated on here.
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hard idle
January 9, 2005 - 2:01pm

well......the only thing i can suggest to you to take your mazda to a local dealership and have them run a diagnostic scan on the car to see of there are any miss-fire codes or any other OBD2 Codes on the car. maybe something will come up and they can diagnose the problem and possibly fix it. I work at Floyd Traylor Honda Mazda in Fort Smith, Arkansas....but i have never heard of the problem that you are having.

Feel free to call us at Floyd Traylor at : (479)-646-7344
And ask for Dustin Jones and tell him the problem you are having.
He might be able to tell you what it is without looking at the car.
And then again....he might not.

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