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Coupes & Convertibles Mazda RX-8 Mazda RX-8 Starting and Stalling Problems
50 messages, Last post on Nov 08, 2009 at 2:45 PM
You are in the Mazda RX-8 Forum. Your Host is claires
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My 2004 AT with 37k has slowly acquired a vibration when in gear and stopped. You feel it in the brake pedal,steering wheel,doors, and you can see the vibration in the mirror's.Dealer said that their scanner/computer show that everything is in the NORMAL RANGE LIMITS....... The motor mounts have been checked and show no signs of wear. The trailing plugs and coil were replaced along with the leading plugs 2 weeks ago and has not helped to negate the loud vibration. I only feel it when stopped.  Any ideal's or recommendations of RX8 dealer's in N.Cal. bay area ? Doug H.
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Replying to: bullwinkle fan (Feb 22, 2008 1:12 pm) I have this same exact problem with my 2006 AT. My original dealer gaves me the same BS line about it. I went to another dealer, and they replaced my engine mounts. That worked for a little while, but then it came back. I have now gone through 7 sets of engine mounts in 15K miles, and now there isn't any difference after I get the engine mounts - the problem still exists and seems to get worse with time. The problem was worse when my AC was turned on, so once they replaced my mass air flow sensor and that problem was solved, but not the overall problem. My car also "stumbles" from time to time when I put it back in gear from neutral at a light. Try puting your car in neutral at the light - the vibration should stop or be barely noticeable. Mazda had a regional rep come out to look at my car, and his solution was to give me my 7th set of motor mounts. The vibration was a little better for about 10 feet, then it was back and worse than ever. One of the service managers at the dealership confessed that certain 8's do that and they don't know why - others are fixed by relacing the engine mounts. It is maddening to me. Sorry I don't have a solution, as my car was never fixed. I also had a slew of other problems, so my solution ended being to sue under my states "lemon law". I am in the process of settling with Mazda now.
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Replying to: duke15 (Feb 22, 2008 8:51 am) 1) Don't use the full automatic in city driving. 2) For 20MPH use only 1st gear. 3) For 35MPH use only 2nd. 4) For 45MPH use only 3rd gear.) If you are traveling highway speeds above 65MPH full automatic is OK. The above strategy keeps the RPM level around 3000. After the first year of driving I began to notice that full automatic in city driving would constantly dive into 3rd or 4th gear, clearly lugging the engine creating a jerkiness in the over drive gearing. With the engine seeking the lowest gear at the first opportunity, I also noticed dramatically rougher idle. The rough idle appeared to go away after driving a long highway trip where RPM tended to remain above 3000 for long periods. I believe there are two things going on with the RX-8 AT. The engines simply need to run at least at 3000RPM to keep everything clean and clear. Second, the electronics have a bit of fuzzy logic which will attempts to over optimize at low RPM speeds, producing more idle vibrations. The fuzzy logic controller remembers ten of thousands of previous gear shift behaviors, so it takes a while for the electronics to be retrained to new behaviors. Or just re-flash the PCM. |
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It is also widely considered to be a good idea to run a rotary to redline fairly frequently to prevent carbon build-up (and I believe to get the apex seals lubed up a bit more). I try to redline mine at least once every day that I drive it. Just make sure it is really warmed up before you do this. At the very least don't drive it hard until the coolant temp gauge has reached the normal range. I also have an aftermarket oil temp gauge installed, and the oil doesn't get above 120 degrees until a few minutes after the coolant temp reaches the normal level on the gauge. I'm not sure at what temp the oil is safe to run hard, but I wait until that needle moves some. |
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I got my car about a year ago , used with 70k miles ... yea ok , get it out , everyone says WOW you got 70k out of your RX-8?? well i did find out it did have a new engine put in just before i got it , it now has about 85k miles and still has the same problem as when i bought it ... this is it... it runs just fine (except the intermate vibrating while stopped) and out of the blue it loses power .... rattles (like a BAD spark knock) at high RPM and if i stop while its doing this it will die and not start up for about 10-20 minutes ... Ive had it to several dealers with more the several different stores ... what ive found that helps is this ... use either 1/2 bottle of trans fluid per tank of gas or add some marvel mystery oil to the gas , and DO NOT use gas with any ethonal and ony use 93 otc... Just wondering if anyone else is in the same boat as me . I love my car but cant find anyone to find out whats wrong with it , that is if there is anything wrong with it ... mabey thats just the way the car is 
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Replying to: vkat (Aug 12, 2008 7:35 pm)
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Replying to: theplanet (Aug 22, 2008 3:37 am) If someone can offer any info that would be awesome , i just want my baby to run right 
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Replying to: vkat (Aug 12, 2008 7:35 pm) |
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Replying to: boof1 (Oct 16, 2008 11:21 am)
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