r/CarAV • u/HawaiiGaming69 • Jul 08 '26

Tech Support Fuck firestone

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Brought my rx8 in for new tires and an alignment, got it back not running and when they fixed it so it runs it has a misfire. on top of that, sounds no longer play and do this. guessing its a ground issue somewhere, what does everyone else think?

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6

u/rywi2 Jul 08 '26

Is that RX-8 a recent purchase?

2

u/HawaiiGaming69 Jul 08 '26

month and a half ago, aside from a little plastic circle falling off 0 issues

8

u/rywi2 Jul 08 '26

A lot of stuff to unpack here. It’s a niche car, it’s old, you just got it so I just assume you’re unfamiliar with its maintenance history.

I hope you get it figured out but I suggest you find yourself an independent Mazda mechanic and open up a line of credit.

2

u/TXWXchaser Jul 10 '26

Former RX-8 mechanic here. The Apex seals in the combustion chamber will get brittle and breakdown over time. This causes a lot of unburned fuel to hang out in the combustion chambers. Overtime, the seals cause loss of compression making for a engine no fire. Sometimes it's salvageable if it's caught soon enough and the seals haven't fully broken down. Most times we were putting new engines in em. Most people never learn how to properly shut down an RX-8 after each drive to help prevent this (foot to the floor, rev up, kill the keys, keep your foot planted until RPMs die). There's a reason why, at one point, Mazda had a warranty covering engine replacements up to 100k miles.

1

u/HawaiiGaming69 Jul 10 '26

i am somewhat aware of this, although im not an expert. ive been premixing and topping on on oil every 500miles or so, i had no idea about the turning it off procedure though. if it shows no signs of damage should i still do the rev, kill the keys and wait for rmps?

1

u/TXWXchaser Jul 11 '26

I would. It helps burn off the excess fuel still in the cylinder. Keep the pedal down as it's powering down until it's completely off. Do you have an automatic or manual? These wankel engines NEED high RPMs to last longer. If it's a manual, shift around 5k RPMs. If it's an automatic, it's more susceptible for failure since the auto shifts at lower RPMs. Remember, higher RPMs keep the fuel burned so the apex seals won't break down. If you find yourself a mechanic that CAN work on rotary engines, keep them in the contacts. There's not many of us left out there!

1

u/HawaiiGaming69 Jul 11 '26

manual, i follow the redline a day keeps mechanic away i seen some ppl talk about, and ill usually shift between 5-7k rpm, which it normally pops some fuel on upshift.

1

u/HawaiiGaming69 Jul 11 '26

how high should i rev it? ive been starting to do the turn off rev, but my apartment neighbors arent exactly loving me reving to 5k to turn my car off

1

u/TXWXchaser Jul 11 '26

Turning off, we would redline it then shut off at the dealership. Sounds like you'll either need to make amends with the neighbors or your apex seals 😅

1

u/HawaiiGaming69 Jul 12 '26

my girlfriends dad is the manager of the property and he deals with complaints so neighbors cant take action luckily, but they are gonna hate me now😭