04 mazda rx8 cutting out when low revs!! help!!
 

Hey people im new to the rx8 owned one for the past month or so i have an 04 plate and it has 46000 miles on it! i noticed it had the well known hot start problem it started ok (ish) when cold, i had a look online and thought i would change the starter motor which i successfully did today now the car starts fine when hot or cold but when i drive and then come to slow down at a round about or junction the car will stall... im thinking about buying a new battery as the one in it looks old but i dont know if that will fix the issue, if anyone knows what it could be your help would be greatly appreciated!! thanksssss :)

You patched the compression problem with a new starter, but you didn't actually replace the worn metal inside the engine, so you still have low compression, and when it gets hot, it still stalls out from an inability to maintain compression at low speed.

Go get a compression test.

replace coils , leads and plugs ......... assuming compression is reasonable .

sss

i understand what your saying about the compression but its never had this problem before until i changed the starter which was today... and all of a sudden this problem, its seems to much of a coincidence i feel like replacing the motor has caused this problem... thanks

i was thinking this what would a fresh battery offer the car? does it help with how the car runs or not?

it has an effect on how well the car starts ........... has no effect on how it runs !

Right ok, so you think new plugs, coils and leads are necessary? How does a compression text work ? will any garage do it?

New and Potential Owners: So I need a Compression Test, Right?

Details all about the test, and who can give one.


Another thought just occurred to me. You disconnected the battery (presumably) to replace the starter. It could be a fuel trim problem. Start the car and let it idle itself warm, and then an additional 5 minutes of idling. See if the stalling problem disappears.

thank you i will try this tomorrow and let you know thanks everybody :)

run a compression test for sure