Last post on Oct 18, 2006 at 9:17 AM
You are in the Mazda RX-8
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Mazda RX-8, Coupe
#1241 of 1414 Re: Squeeky brakes are gone!!! (hopfully for good) [fishnhard]
Apr 24, 2006 (5:05 am)
I've got an 2005 RX-8 AT Sports Package. I've got the squeaky brakes. I've always had the little rattle or popcorn noise which appears to exist on all auto trannies. I've also got a significant vibration in the LSD after drive on the highway.
After asking about these problems on this list many times, all the issues appear to be normal RX-8 privilege of ownership glitches. All the above issues have appeared over the entire history of the RX-8 model and should best be view as badges of honor for which owners need to be proud that they noticed, but should be left alone as mysteries to appreciate and theorize about.
Here are my theories.
1) The rattle or popcorn noise relates to the second firing of the upper spark plug. I think the auto-tranny RX-8 is quieter, therefore AT owners can hear more engine related noise details. The AT also is more complex from a fuel mixture vs auto gear shift computer calculation perspective. The complexity means that there is not as perfect of efficient fuel mix going into the engine at various moments at different RPMs. What we RX-8 AT owner hear in the way of the rattle or popcorn noise is the second spark plug burning the excess fuel. (PathStar will probably shoot me down, but I like my theory of the mysterious rattle/popcorn noise and I'm sticking with it, at least until PathStar shoots me down. Oh well.)
2) Break squeak is totally normal as confirmed by an official Mazda Service bulletin I saw online. Customers who ask about the squeak breaks, have the shims fix done as the corrective, but it's not a recallable or problem item. It's just a break squeak according to Mazda.
3) LSD vibration is normal mechanical function which just needs to be broken in over time. Since I can't drive to crazy here in the Boston traffic nightmare, it'll probably take 20K to break in my LSD. This is PathStar's advice and I except it totally until I reach 20K. Then if the LSD vibration is still bad I'll ask the the deal "What's up with that LSD?"
BTW, I'm worried my dealer over filled my oil on the last change. Are there any ways to check for over fill besides the dipstick?
#1242 of 1414 Re: Gas mileage [baknpat]
Apr 24, 2006 (8:35 am)
I've run some 10,000 miles on my rx8 using regular 87 octane gas--I don't notice any difference in normal driving conditions.Here in california all our gas contains oxygen[either ethanol or mtbe].I would certainly try regular gas in yours-- higher octanes are not required.
#1243 of 1414 Squeeky brakes!!!
Apr 24, 2006 (12:39 pm)
Well trispec, I am glad to know I am not the only one out here with an AT RX-8. The "rattle/popcorn" noise still bothers me. Due to the fact that the only time it will happen is if I put the shifter in the normal AT mode. If I use the auto stick or the paddles, it will not do it. The other thing I have noticed is Mazda likes to put a lot of blame for problems on the fuel!! I have been a mechanic for a long time and only on a few cases have I seen fuel be the problem. We have not had any problems with the LSD. Might be due to here in WA I have a lot of chances to get the RPM's and speed up over 60.
I forgot to mention that when the car gets to the point where the rattle happens, we have also been getting black smoke from the tail pipes from time to time, which is an indication of over fueling. I dont buy the fact that the fuel is the cause of all of that. I can believe the fact that the computer is allowing too much fuel into the engine. I am going to call and make yet another appointment with the dealer for this issue.
#1244 of 1414 Re: Squeeky brakes!!!!! NOT HAPPY [fishnhard]
Apr 24, 2006 (3:45 pm)
beware!!! i purchased a 2005 rx-8 in june of 2005, needless to say 12,000 miles later the engine died, it was running through oil like crazy, gas mileage is between 10-14, brakes started squeaking after 3,000 miles, now the car has been in the shop for over 60 days total in 10 months, mazda has replaced the engine 3 times, yes im on my 3rd engine due to these mechanical problems. i think mazda knows they have a major recall coming with these cars but is trying to put it off. there is alot more i could tell you if interested i can give you more info. keep an eye on your oil consumption.
#1245 of 1414 Re: Squeeky brakes!!! [fishnhard]
Apr 24, 2006 (6:19 pm)
Yep, rattle/popcorn noise bothers me too. But I owned an 1987 RX-7. My 1987 RX-7 rotary engine, the 13B rotary had the save displacement as the current Renesis Rotary in the RX-8. I don't recall a rattle/popcorn noise back then, but then again the engine only generated 130HP. Now we get 238HP MT) out of the same engine displacement.
I haven't noticed black smoke, but there is plenty of carbon on my tail pipe. I notice the rattle/popcorn at much lower RPMs 2-3K. I also notice, that by carefully managing the gas peddle and RPMs in manual mode, I can prevent the noise completely.
Clearly the current RX-8 is one heck of a design. The reviews of the Renesis design certainly could have over looked minor glitches. I don't fault Mazda. I don't think the dealers, and I don't fault them either, really know the RX-8. I think the dealers like style points. But the RX-8 is a rare design. I'll take the rare, unique and cool design over a Toyota or Honda design of ultimate perfection any day. Nothing like revving a rotary.
I drove a 2000 mile trip through five states at 85 mph and got 23 mpg. That's quite good by any measure. I think the engine is fine.
#1246 of 1414 Squeeky Brakes!!
Apr 24, 2006 (6:50 pm)
Thanks again trispec for your input. We also can make it not happen. But the point is it does. I too love the unique style of the of the car and the power and what not, but the fact remains it makes a noise it shouldn't have. I worked for Chevy at one time and had to deal with the cold start knock, let me tell ya I got a lot of ticked off people who paid good money for a vehicle and to have stuff like this happen just wont fly with me. Espically with 3200 miles on it. Dont get me wrong all vehicles have a glitch here and there, but knowing the past history on the 2004 and all the problems, I am leery. I called Mazda of North America today, and they told me they have identified almost all of the problems on the car, the problem is getting them to do it when at the dealer. I now a file opened with Mazda to keep track of the work done and if its done correctly.
#1247 of 1414 Re: Squeeky brakes!!!!! NOT HAPPY [posrx8]
Apr 24, 2006 (6:54 pm)
posrx8, I would love to have any info you may have regarding your problems. Just in case we end up with the same problems. I am sorry to hear you are on your 3rd engine. I am surprised you didn't make them buy the car back under the law. I do hope the problems on these cars are taken care of, but I am not surprised to have small problems. It just sounds like all the problems I am hearing about are not small. Look forward to hearing from you.
#1248 of 1414 Re: Squeeky Brakes!! [fishnhard]
Apr 25, 2006 (1:33 am)
Your a better consumer than I am. I hate a fight. But I do beleive like the discussion of these issues here.
Good luck. Let us know what happens.
Apr 25, 2006 (8:01 am)
Is there anyone on here that lives in WA state? I would like to meet up with others to have some fun and enjoy these cars with others. I know there are Miata clubs, are there any RX-8 clubs here?
#1250 of 1414 Re: Squeeky brakes [fishnhard]
Apr 25, 2006 (4:50 pm)
Check out "http://rpnw.org/". BTW, there is a "rally" (meet) in Wenachee in May, with the Apple Blossom Festival.
For those not in Washington state, there are local rotary clubs elsewhere as well. For a long time we had to support ourselves as Mazda was "out" of the rotary, so these clubs are well established.