Misfire in 2004 RX-8

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rob fullwood
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Misfire in 2004 RX-8

Post by rob fullwood »

Hi i have a 2004 rx8 192 covered 65500 miles.
I have had the car 13.5 years. it has been regulary serviced and all recalls updated.
recently in heavy rain the car had the engine management light flicker then permanantly display.
I have read the forums and have changed the plugs, crank sensor and leads.
the car runs perfectly for around 5 miles.
when you put strain on the engine and try to accelerate the light flashes and limp mode. A few hundred yards later the car bursts back into life. it will then run perfectly for a long period of time .
Out of nowhere it starts splutter again then rectifies itself.
I have read about the problomatic symtems rotorary engines have. Also how expensive they are when they go wrong.

This is the first major problem in 13.5 years.

could anyone point me in the right direction please ?

Thanks inadvance.
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Re: miss fire in 2004 rx8

Post by warpc0il »

First thing you need to identify what CEL codes have been stored.
viewtopic.php?f=25&t=43997

Flashing CEL indicates a misfire viewtopic.php?f=25&t=80593&p=1233254#p1233254 but there could be something else.

However, misfire does not trigger "limp mode" so either it isn't a true limp mode, just down on power, or something like a poor OMP connection is triggering limp mode - in which case it will be recorded by the PCM.
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miss fire in 2004 rx8

Post by GreySilver Beast »

Hi Rob & :welcome: to the RX-8OC :thumleft:

<<<<<< Please put your Location in your Profile Box, it will help us to know where you are, if required any help in the future :thumright:

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rob fullwood (Sat Sep 26, 2020 3:49 pm)
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Re: miss fire in 2004 rx8

Post by Shagrington »

Hi and :welcome: Rob - we were wondering for the last 13 years when you would turn up ;)
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rob fullwood (Sat Sep 26, 2020 3:49 pm)
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Re: miss fire in 2004 rx8

Post by rob fullwood »

thank you all for your help.
I will change coils , and get omp connection looked at.
do i need a dealer to give me a diagnostic for the codes or can any reader let me know?

I used rac when broke down, and gave me miss fire in 2nd cylinder and crank sensor. i changed plugs,leads & crank sensor (Guess i should have changed the coils at time)
if that fails i will need some further help.

Regards

Rob
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Re: miss fire in 2004 rx8

Post by bigpete8 »

Buy a cheap elm327 clone (suitable for your phone} and invest in an appropriate app (torque) probably cost less than a tenner all together.
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rob fullwood (Sat Sep 26, 2020 3:48 pm)
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Re: miss fire in 2004 rx8

Post by qwakers »

or forscan, works better.
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Re: miss fire in 2004 rx8

Post by Boston Rotary »

To remove the misfire code just do the 20 brake stomp
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Re: miss fire in 2004 rx8

Post by warpc0il »

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Re: miss fire in 2004 rx8

Post by rob fullwood »

I have had 13 years trouble free motoring with the car off road for winter last 6 years.
the pst twelve months i have had a miss fire in pot 2 so i changed plugs, leads coil. That worked. Following it being garaged it the battery went dud, Ichanged the battery. The car then had a miss fire pot 1 i have change exhaust and cat. the car will run ok for a few mile then miss fire badly. the last time trying to get car home 6 miles in traffic the exhaust got that hot it glowed orange. Does anybody have an explnation or is it time to move it on ? It is in very good condition for age only covering 65000 miles.
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Re: miss fire in 2004 rx8

Post by qwakers »

what coils plugs and leads did you fit. where did you source the cat?
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Re: miss fire in 2004 rx8

Post by rob fullwood »

i used genuine mazda leads and plugs, halfords coils. the cat was sourced by a mechanic, it has a new stainless steel exhaust. engine miss fires and cat glows. any ideas?
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Re: miss fire in 2004 rx8

Post by qwakers »

yeah, take the coils back. even if they're not the issue, (and id bet they are) they soon will be.
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Re: miss fire in 2004 rx8

Post by 30405 »

rob fullwood wrote:i used genuine mazda leads and plugs, halfords coils. the cat was sourced by a mechanic, it has a new stainless steel exhaust. engine miss fires and cat glows. any ideas?
Halford coils would be my first suspicion.
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Re: miss fire in 2004 rx8

Post by warpc0il »

:whathesaid:

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