Last post on Oct 18, 2006 at 9:17 AM
You are in the Mazda RX-8
What is this discussion about?
Mazda RX-8, Coupe
#1341 of 1414 Re: Its a shame this car has so many problems. [slingshot80]
Aug 08, 2006 (8:24 pm)
The 2006 Consumer Reports annual car issue, which came out in April, reported that the RX-8's reliability has improved to the point where they can recommend the car to prospective buyers.
I bought a new RX-8 6-speed in June 2005. I now have almost 9000 miles on it, and except for an aftermarket Lojack-type system that the dealer talked me into (and caused the battery to go dead 5 times in 8 months), the car has been perfect. Mazda removed the GPS system and refunded the money to me, and also gave me a new battery at no charge. I love the car - I'm not a real leadfoot but I get 23 mpg at steady 75-mph cruising, and never less than 18 mpg around town, even with the AC on (during Arizona summers!). Just my opinion, but from reading some of these posts, most of the problems reported seem to be on the first-year 2004 model. Also, someone mentioned that using synthetic oil is OK - every Mazda dealer I've spoken to says you'll end up needing a new engine. I have to trust their word, I only use Valvoline 5W-20 non-synthetic - why risk something else?
#1342 of 1414 Re: Engine reliability [pathstar1]
Aug 10, 2006 (2:32 am)
I've changed my technique for driving my 2005 RX-8 AT in Boston. Now am focusing on the seemingly opposing goals of keeping the RPM levels around 3000 while holding the line on gas millage at 15MPG for my pure city stop and go traffic commute.
First, running in manual mode I shift to second very quickly, using first only to get the car moving to 8-10MPH. Take offs are nice and slow up to 17MPH. Then at 17MPH I hit the resume cruise which is preset at 35MPH. I let the cruise control take the speed from 17MPH up to 35MPH. I leave the tranny in 2nd the entire cruise portion and repeat the process at every stop and go leg of the commute.
I believe using cruise to finish the acceleration and to cruise around the city is the best way to minimize the waste of gas that acceleration causes. I don't think there's much difference in MPG cruising around at 3000RPM in 2nd vs cruising around at 2000-1500RPM in 3rd or 4th respectively.
Plus the above technique seems to nearly eliminate completely, the popcorn/rattle I hear during low RPM acceleration.
Aug 10, 2006 (6:13 am)
I just recently had my RX8 serviced and they flashed the PC with then new software, and after that I started having the popcorn noise and loss of power the same day I picked it up, called them told them and they said to come right back the next morning, but when got there is was no longer happening, they said it could just be the pc re-learning how i drive, so I went and bought some octane boost with a new tank of premium fuel, and the problem went away, and i thought the problem was solved, last night i filled up again without the octane boost and the noise came back, loss of power again, so i stopped in and picked up the octane boost, put it in and the problem stopped right away, so I have come to the conclusion that it is the poor quality of gas, and with some octane boost or better gas your noise and power problem will be resolved! Let me know if it works for anyone else!
#1344 of 1414 Spark Plugs??
Aug 11, 2006 (8:55 pm)
So i was on my summer vacation for the entire month of July (in aussieland ).. while i was away i had asked my brother to warm up my 8 every 2-3 days. Apparently he had done so for sometime until one day the car wouldn't start, when i got back i tried to ignite but the car would just keep trying to ignite without really getting to the final stage where the engine starts-- just draining the battery pretty much.
My guess was that the engine had flooded, so i followed the steps in the owner's manual for flooded engines.. didn't really work! are my spark plugs busted? im quite worried!
#1345 of 1414 Re: Spark Plugs?? [moadh]
Aug 12, 2006 (7:17 am)
Nothing to be worried about. The plugs may be fouled. You can remove them and clean or replace them. Note that the upper ones are different than the lower ones - Trailing plugs on top, Leading plugs lower is how I remember it. There is one of each for each rotor - four plugs total. They aren't hard to reach from above on the RX-8 - just push the hoses back by the firewall out of the way.
To start the car, fully charge the battery.
Hold the accel. pedal to the floor and crank the engine in 20 sec. bursts, with about a minute between to let the starter cool down. Keep the pedal to the floor during all of this - this keeps the PCM (computer) from injecting any more fuel. This can take 5 min. or more of work.
When the engine fires release the pedal fully and let it start. Once it starts you may have to use the pedal to keep it running, as one or more plugs will probably be fouled (unless you fixed that first). Once it starts to warm up the plugs should clear.
To clear a really badly flooded rotary, first pull one plug on each rotor and squirt a shot of oil in there (just a cc or so), and turn over the engine (pedal to the floor). Then replace the plugs and proceed as above. This improves the apex sealing and allows the engine to push out the excess fuel. Note that when it starts the oil will create a large cloud of smoke so don't panic.
#1346 of 1414 Re: Spark Plugs??
Aug 12, 2006 (7:54 pm)
Thanks a lot pathstar, uve been a great help!
#1347 of 1414 Re: Spark Plugs?? [moadh]
Aug 13, 2006 (7:03 am)
Great, got it started? I suspect your friend doesn't understand you have to warm it up before shutting it off - that is, see the temp. gauge move up. The latest flashes (program for the engine computer) seem to just about eliminate the flooding, but if someone tries hard enough, you can still flood an RX-8.
Aug 13, 2006 (12:31 pm)
pathstar, my husband wants to put a twin turbo on our 2004 RX-8 six speed manual. do you see any cons or future probmatic conserns that could happen with doing this? I have heard that it really uses up a lot of gas...is it very loud to do this? is it worth the effort/cost?
#1349 of 1414 More on my popcorn/rattle
Aug 16, 2006 (2:59 am)
Here are a few additional bits of information about the popcorn/rattle noise that my 2005(group 2) RX-8 AT makes.
1) On cold starts, the popcorn/rattle will start instantly if I put the transmission into reverse gear immediately. If I wait a minute or two before putting her in gear and for the high pitched fan noise (automatic choke mode?) to stop, the popcorn/rattle will not start until a mile down the road.
2) If I drive will the RPMs religiously held around the 3000 level, the popcorn/rattle is minimized. when I get stuck in stop and go traffic, Huntington Ave in Boston at 5:00pm, the popcorn/rattle is much more noticeable.
#1350 of 1414 Re: More on my popcorn/rattle [trispec]
Aug 16, 2006 (5:06 am)
Oops, forgot this one.
3) If I'm driving in first gear at a constant speed at a high rev 5000, there is no popcorn/rattle, but the moment I shift to second, without letting off the gas, I'll here the popcorn/rattle for a few seconds. It's almost like there's too much gas flowing through the system and it takes a few seconds for the computer to balance things. Now if I attempt to smooth the shift shock (love that nissan add ) by letting off the gas on the shift to second, there is little to no popcorn/rattle.