jbarajas19

Hey I'm new here, my name is Jesus and I have a little or maybe big problem. I have a 2004 rx8 4spd auto (yeah Ik it sucks) well a few weeks back as I was driving to my friends house, I wanted to have a little fun and at the same time give the engine it's daily redline to clean it off a little and as I started accelerating I noticed something rather strange. When the car hit about 80 mph and or like 6-7k rpm in 3rd gear. I noticed a huge loss of power, the car would accelerate really really slow and at the same time I heard some kind of grinding in the engine bay. So I immediately shifted to 4th gear and slowed down to reduce the rpm and that seemed to fix the noise. I started investigating the problem. Worried that my engine was kicking the tires, I decided to do a compression test and I got 120psi which is in good condition for a rotary. Next I decided to replace my spark plugs and also get an oil change. That kinda fixed the problem a little... At least for the first two days it seemed. Just last night as I was accelerating again at about 6-7k rpm the same engine grinding noise and the loss of power. Have any of you experienced something like this? Should I be worried about my engine or could it be something simple I missed to check?

Also forgot to mention I'm about to hit 130k miles on this baby.

WGawlik

Deleted.

WGawlik

The grinding may be a fault in your auto tranny, you may want to have a Mazda tech have a look and see if any gears are grinding. Or you can look up a tutorial on how to do it yourself and save some $$$.

jbarajas19

So you're saying I might need to get a new tranny?

Khurram

No He is saying have it inspected.
When was the last time you replace your tranny and diffrentials fluid?
What fluid are you currently running?

jbarajas19

It's been a while since I checked the transmission fluid. That's something I don't regularly pay attention to. I never connect loss of power with the transmission. Is there a diy on how to change the transmission fluid?

Delvec03

There are a ton of Trans fluid DIY's out there. Its literally two plugs (one drain, one fill) and a pump to get the new stuff in. Do some googling, should be able to find something with little effort.

Do rear-diff fluid at the same time. Exact same procedure, different fluid!