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I have a problem with my 05 rx8 sometimes it idles like it…

Customer Question
Hey drew I have a...
Hey drew I have a problem with my 05 rx8 sometimes it idles like crap it keeps bouncing from 500 rpms to 1500 then it evens back out to 850-900 and then it just repeats it’s self sometimes the car will idle at 850-900 rpms then rev up to 1250-1500 rpm area then kill itself but I had it idleing for over an hour thinking it has to relearn itself but no luck with that
Submitted: 8 months ago.Category: Mazda
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Customer reply replied 8 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer reply replied 8 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 8 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 1 hour by:
9/23/2017
Mazda Mechanic: david craig, ASE Certified Technician replied 8 months ago
david craig
david craig, ASE Certified Technician
Category: Mazda
Satisfied Customers: 5,591
Experience: owner/mechanic at 3D Automotive
Verified

Hi Im David, thanks for visiting the site. Is the engine also running rough?

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Customer reply replied 8 months ago
Define running rough I did do a tune up new plugs wires all fluids drained
Mazda Mechanic: david craig, ASE Certified Technician replied 8 months ago

Have you been able to get fault codes? also here is some things you can look at

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Customer reply replied 8 months ago
The only fault codes I’m getting is po420 but we cleared everything in it
Customer reply replied 8 months ago
It was throwing stuff but I replaced a lot of it and every time I replace it the car was perfect until the engine light came on then it would act up again
Customer reply replied 8 months ago
Hey I was wondering if you can help me solve why my rx8 is having a rough idle I changed all my fluids new plugs coils and wires new throttle body new throttle position sensor new pedal position sensor new mass air flow sensor new air filter I always use shell v-power gas but sometimes it idles fine and sometimes it just idles like complete shit like last night I drove I drove it to the town next to me which is 20 miles and soon as I put it in neutral at the stop light it idled at 250-500 rpms then jumped to 1500 then killed itself but the next two lights it idled at(###) ###-####rpms but did not die I took it to shell topped it off and drove it back to my town and it threw a P0420 code but there is no cat but I pulled into Walmart and it died I started it up idled at 850-900 rpms for 3-5seconds then went to 1500 rpms then killed itself it did that like 5 or 6 Times then after that I started it up again and it stayed running for 30 minuets no problem with it dying it was just fluctuating from(###) ###-####rpms then idle perfect for a couple minutes then the(###) ###-####rpms again for a bit then idled perfect again it kept doing this I drove it home at the next light the rpms kept dropping to around 500 rpms then back up to around 1000 but never died the car does a have a rebuilt engine from Mazda I think less than 20 or 30k miles ago and a stage 3 clutch less than 10k miles ago
Mazda Mechanic: mike switzer,
 replied 8 months ago
mike switzer
Category: Mazda
Satisfied Customers: 733
Experience: lead diagnostic tech at Aamco
Verified

do you have a lightwhieght flywheel with that stage three clutch?

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Customer reply replied 8 months ago
was done professionally
Customer reply replied 8 months ago
I drove it today and every I started it up cold it kept dying but soon as I drove it for a hour it and it was warm it didn’t die and the car starts up immediately cold and hot
Mazda Mechanic: mike switzer,
 replied 8 months ago

rotary engine do not like lightwheight flywheels at all. because of how the ignition process works they need the factory whieght flywheel to run reliably.

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Mazda Mechanic: mike switzer,
 replied 8 months ago

i used to see this all the time when i worked at a prominent rotary shop in California.

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Customer reply replied 8 months ago
But it dies in idle even without touch the clutch
Mazda Mechanic: mike switzer,
 replied 8 months ago

exactly rotary engines need the mass of the flywheel to keep the engine rotating at low engine rpms. a lighter flywheel does not make for a high idle speed it actually does the opposite even on normal piston engines. you need to tune the ecu to increase the idle for them.

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Customer reply replied 8 months ago
Will I have to replace the clutch also or will a stock flywheel work on a stage 3 clutch
Mazda Mechanic: mike switzer,
 replied 8 months ago

most of them will work with the factory flywheel. that will have to be determined did you buy it as a set or the clutch and flywheel independantly?

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Customer reply replied 8 months ago
I’m not the one who had it installed the guy I bought it from he was selling a car for his friend and he told me it had a newer engine and a new flywheel and stage 3 clutch installed but I’m not sure what brand it is or if it was a kit
Mazda Mechanic: mike switzer,
 replied 8 months ago

that is something you would need to find out. however like i said most clutches even performance ones are designed to be compatible with the factory flywheel. without knowing exactly which one you really wont know until it is apart.

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Customer reply replied 8 months ago
Would you say it’s safe to drive or if I drive it would it hurt anything until I get it tuned
Customer reply replied 8 months ago
Also with my P0420 light is there anyway around that besides putting a new cat on it
Mazda Mechanic: mike switzer,
 replied 8 months ago

no way to get around the 420 code. i have seen people use spacers to hold the o2 sensor out of the exhaust stream further and have ha success with that. but it is never a guarantee. as for the clutch no real damage can be done just some drive ability like you are having.

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