Large milage reduction
#1
RJH
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![CA](https://www.rx8club.com/images/icons/ca.jpg)
2004 standard shift with 142k miles. Have averaged around 18/20 mpg since AI bought the car new. The last 2 weeks the miolage has dropped to around 13/15 mpg. I have not noticed any reductionin power, or change in drivability. Weather has been cold - lows in 30's highs in the 50's but I never had this problem in prior years.
Will be going in for service in a week or so but would like to have some idea is this is happening to others.
Any ideas?
Will be going in for service in a week or so but would like to have some idea is this is happening to others.
Any ideas?
#8
RJH
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I believe they were changed at 60k and 120k. I'm not sure of the exact mileage but approximatley 4k miles ago at my last service the dealer looked at my service record and inidcated that the plugs were last changed at around 120k. I'm due for a service so I'll mention this to the dealer. I was just curious if this was something that people were noticing on a regular basis.
#9
Time for boost...
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plugs and coils should be changed every 25k miles (some more often; some less). If you want to save some cash, do the job yourself. It really isn't too hard to do, and by doing it you'll feel more attached to the car ![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Also, I would recommend getting your plugs/coils/wires from BHR (black halo racing). They are much more durable than the OEM ones, and they should last the life of your engine...
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Also, I would recommend getting your plugs/coils/wires from BHR (black halo racing). They are much more durable than the OEM ones, and they should last the life of your engine...
#10
RJH
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I agree. I used to do it all myself but work has interfered with my time and I've gotten in the habit of letting someone else take care of it.
Thanks for the responses.
Thanks for the responses.
#11
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2004 standard shift with 142k miles. Have averaged around 18/20 mpg since AI bought the car new. The last 2 weeks the miolage has dropped to around 13/15 mpg. I have not noticed any reductionin power, or change in drivability. Weather has been cold - lows in 30's highs in the 50's but I never had this problem in prior years.
Will be going in for service in a week or so but would like to have some idea is this is happening to others.
Any ideas?
Will be going in for service in a week or so but would like to have some idea is this is happening to others.
Any ideas?
#14
RJH
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I bought the car new in Aug 2003, put a lot of highway and track miles on it for the first 100k miles and then took it off the tract due to concern about the high mileage. Will check the 02 and MAF.
Does anyone know of a good reliable independent Rx8 shop in the Sacramento area?
Does anyone know of a good reliable independent Rx8 shop in the Sacramento area?
#15
Filth in a world of Clean
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You may want to check the cat, (I don't think anyone mentioned that yet) the best way to do this is to pull it down and visually inspect it, anything other than a perfect honeycomb pattern is bad. You can tap the cat with a screwdriver and if you hear any rattling from inside the cat, then it is bad. If not, that doesn't mean it's not bad tho. The element could have fused together.
#17
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![Icon No2](https://www.rx8club.com/images/smilies/icon_no2.gif)
you should know better. there's plenty of evidence to say otherwise. OEM coils ranging from brand new to 30K or so have been tested(properly) and shown to be junk. FWIW even Mazda's bogus test procedure has shown brand new to 30K coils as bad plenty of times. I kept record of mileage for a couple years and when I got rid of OEM coils @ ~30K the difference was astounding and also significantlymore than I ever got on OEM coils.
I'm not saying the OEM coils will keep the car from running smoothly. I'm saying they are barely adequate even when brand new. Thats not any debate around here, its common knowledge that has been tested, proven, and beat to death long ago
#21
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After all of the failure stories I have read about on this forum, it's nice to see someone who has taken their engine well beyond 100,000 miles. Do you mind sharing your maintenance routines? What type of oil used, premix or not, etc...
#22
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![CA](https://www.rx8club.com/images/icons/ca.jpg)
I have been very strict about sticking to the dealer schedule for maintenance. And have always kept extra 5w 20 oil at the house and in the car to make sure that it stays topped up between changes. the engin has not been modified although it has been run hard (lots of track days the first 100k) and lots of high rpm's since then just no track time. Other than that, no premix or anything other than premium fuel.
Based on everything I've read here, mauybe i've just been lucky or maybe the engine just likes to be spoiled. I wish I had some idea of why this one is doing so good but other than the very regular maint. schedule I can't guess. I'd like to get a couple of hundred k on it at least before I trade it, so we'll just have to see.
One other thing comes to mind. Early on the mechanic at the dealership told me to be very careful about always making sure that once I cranked th engin to always make sure it reached full operating temp before I turned it off. So even if I'm only pullin ginto the garage after washing it I take it oout for a spin to get everything running and hot. Of course I never have a problem taking this car out for a ride give the FUN factor!!
Based on everything I've read here, mauybe i've just been lucky or maybe the engine just likes to be spoiled. I wish I had some idea of why this one is doing so good but other than the very regular maint. schedule I can't guess. I'd like to get a couple of hundred k on it at least before I trade it, so we'll just have to see.
One other thing comes to mind. Early on the mechanic at the dealership told me to be very careful about always making sure that once I cranked th engin to always make sure it reached full operating temp before I turned it off. So even if I'm only pullin ginto the garage after washing it I take it oout for a spin to get everything running and hot. Of course I never have a problem taking this car out for a ride give the FUN factor!!
Last edited by rjhutch; 01-18-2011 at 06:44 PM. Reason: Added additional text
#23
WENTGERMAN
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I have been very strict about sticking to the dealer schedule for maintenance. And have always kept extra 5w 20 oil at the house and in the car to make sure that it stays topped up between changes. the engin has not been modified although it has been run hard (lots of track days the first 100k) and lots of high rpm's since then just no track time. Other than that, no premix or anything other than premium fuel.
Based on everything I've read here, mauybe i've just been lucky or maybe the engine just likes to be spoiled. I wish I had some idea of why this one is doing so good but other than the very regular maint. schedule I can't guess. I'd like to get a couple of hundred k on it at least before I trade it, so we'll just have to see.
One other thing comes to mind. Early on the mechanic at the dealership told me to be very careful about always making sure that once I cranked th engin to always make sure it reached full operating temp before I turned it off. So even if I'm only pullin ginto the garage after washing it I take it oout for a spin to get everything running and hot. Of course I never have a problem taking this car out for a ride give the FUN factor!!
Based on everything I've read here, mauybe i've just been lucky or maybe the engine just likes to be spoiled. I wish I had some idea of why this one is doing so good but other than the very regular maint. schedule I can't guess. I'd like to get a couple of hundred k on it at least before I trade it, so we'll just have to see.
One other thing comes to mind. Early on the mechanic at the dealership told me to be very careful about always making sure that once I cranked th engin to always make sure it reached full operating temp before I turned it off. So even if I'm only pullin ginto the garage after washing it I take it oout for a spin to get everything running and hot. Of course I never have a problem taking this car out for a ride give the FUN factor!!
#24
what is a good aftermarket coil for the rx8 that is ready to bolt on where the factory ones go? I do not want to spend a lot of time and energy into relocating them but reading the posts about them makes me wonder.
Thanks for the input
T
Thanks for the input
T
#25
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A word of caution - if it is your plugs/wires/coils going bad, then your reduction in mileage is due to unburned fuel (duh). The unburned fuel can kill your cat. This happened to me (although I can't 100% prove the correlation) - bad coils not immediately dealt with led to a clogged (melted) cat shortly thereafter.
Just something to think about...
Just something to think about...