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Old 04-05-2014, 08:25 AM   #1
t72384
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Default 04 rx8 misfire help!!!

Hey guys im kinda new here but im having high rpm misfires in my 04 rx8. ive read alot of information on the web but still cant figure this out. Ive replaced plugs, plug wires, coils, cleaned the ESS and mass air flow sensor. Its code P0301 front rotor misfire. please someone help






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Old 04-05-2014, 11:40 AM   #2
Dannobre
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Have you pulled the plugs to see if they are all firing?

It isn't unheard of to have a coil or wire or plug that is defective out of the box. Use a coil tester to check the coils....

Have you reset the ESS profile? Sometimes you have to do it a couple of times to make sure it takes....

If all of that is OK...then you might want to do a compression check...if you have an apex seal problem that is allowing combustion gases to bypass the seal you can get missfires.....

Other than that...ECU, wiring, power and grounds to coils, wiring to ESS can all cause problems.

You will also have to check the fuel injectors...if one is not firing properly you could have a fuel related missfire

Good luck....
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Old 09-04-2014, 10:01 PM   #3
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After you replaced everything, did you do the 20 brake presses to reset everything?
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