rodezel

Today i was so excited because i was going to do an oil change to my rx8.
After the oil change i checked everything was ok than i turn the car an let it run for a while. After that i try to drive the car but it didn't want to go in reverse than i try going forward and it does go but it accelerates until 5000rpms to go forward. When i got to a stop the car dies and is not able to go up a hill. Help please
my rx8 is a 2006 6 speed automatic
does someone now whats going on?

CaymanRotary

You changed the engine oil and your transmission is suddenly broken? That's really weird nothing you do during an oil change should affect the transmission. They use different oils.

rodezel

I know but i think i overfill it a little.
Would that be the problem?
when i drove thw car before the oil change it was fine

CaymanRotary

Did you check your oil level? How much over the line is it? Can cause problems but not usually something that affects the transmission.

rodezel

i did its like 1 quarter oil. I try to get some out but the screw in the oil pan is stock idk why.

Loki

iTrader: (1)

It's definitely not that. The transmission doesn't care how much oil is in the engine.

How is your transmission oil level?

rodezel

i might have taken out the wrong one
i was looking at this.

thats the one i drained.

rodezel

i think i might have drain the trasmission fluid pan.

CaymanRotary

Oh jeez... theres your problem. You are running your transmission with engine oil?

UnknownJinX

If that is the case, a full transmission flush with a flush machine is in order. Just double check if the RX-8 AT is flush-friendly. I know some ATs like Honda ATs can be damaged after a flush. I don't know if this applies to Mazda.

Or you could slowly drain and fill, drive, and repeat a few times. Safer, but it will take longer to get rid of the engine oil in your ATF.

rodezel

didn't put any engine oil in the trasmission. I just drained the wrong oil pan. I think i might not have any trasmission oil in there.

UnknownJinX

For an automatic transmission, you won't be able to drain out all of the fluid in one go. There will still be a good chunk left in the torque converter. Just add ATF ASAP and hope for the best.

So let me get this right, you drained the transmission oil, but you filled up the engine oil normally? How much engine oil did you pour into the engine, then?

CaymanRotary

How long did you drive the car with no fluid? You may have just ruined your transmission. Other question is if you drained oil out I would think you would want to replace it so you may have also really overfilled your oil.

rodezel

Well i drove the car for 10 min. I already put some trasmission oil and turn it on but the car goes only forward while in reverse and neutral. I think i ruined my trasmission.

rodezel

i took out some oil so it's not overfill.

Loki

iTrader: (1)

The car only goes forward while in reverse or neutral? NEUTRAL?

First, is the level of the trans fluid correct? There is a dipstick for it. Adjust as necessary.

I would be surprised if the trans is ruined, it may need to work a bit to circulate the fluid (and you may need to add more as it gets pushed around).

​​​​​​

rodezel

my rx8 doesn't have a dipstick for the transmission oil. I got all the instruction. Yeah it goes forward in neutral and also while on parking. I check the car a few minutes ago again and now while in reverse it doesn't do anything but it also doesn't want to go in reverse. When i accelerate to try and go in reverse it just starts to grind and wants to turn off.

CaymanRotary

Ruined your transmission. That sucks...

UnknownJinX

At this stage it sounds more like an electronic issue to me... I would try disconnecting the battery for a while and see what happens. Just a random guess, but it doesn't hurt to try.

On most automatic transmissions, the parking pawl will engage to lock the car in place when you put the car in P, so it shouldn't be possible for the car to move forward while it's in P. That's why I am guessing the transmission electronics are confused. Being low on oil also shouldn't damage it to the point of it not working anymore.

Like Loki said, check the fluid level to ensure it's all topped up. That's very crucial in an automatic since the fluid is used to transmit the power.

And don't rev up the car and try to force it into gears. That's just asking for trouble on any transmissions, manual or auto.

rodezel

alright im going to try and disconnect the battery. Im hoping its just an electric thing. Like i said i put the new trasmission oil in and went for a drive, and it goes smoothly it just doesn't want to go in reverse is like something it's not letting it.

Loki

iTrader: (1)

How did you add fluid to the trans? It's not exactly convenient, there's a fill hole on the side of the trans under the car. Since you don't have a dipstick I'm assuming it's a 6 speed auto.

The trans takes about 9L of fluid, it's not exactly easy to refill.

Moving while in park is not good news though. The parking pawl should be mechanical so even if battery power fails, the car can stop.

rodezel

yeah i added fluid in the transmission fill hole. I would have to see with a mechanic. Well guy thanks a lot for all the tips and all the help.

CaymanRotary

If it wont go in reverse its failed. You'll need to rebuild or replace the transmission. Same thing happened to my F150. Could go through forward gears but if you gotta go back I hope you like pushing cars . That being said I'd rather push an RX8 over an F150 any day of the week XD.

rodezel

well that's true but u know if i put the rx8 in reverse it like wants to go but something it's not letting it.