Power loss, transmission issues on 2008 3i Sport

rdemattio

Member
:
2008 Mazda 3 I Sport
Hello,

I have a 2008 Mazda 3i Sport with 63k miles (Right outside of freaking warranty!) and it seems like its loosing power.
A few months ago I hopped into my car and went to leave and the car just had no power, when I tried to accelerate the car just studdered and hesistated and wouldnt accelerate under any load, and to top it off a bunch of white vaport/smoke was coming out of the exhaust. I immediatly turned the car around and came back home, checked all fluids and coolant especially because I had the thought that maybe my head gasket was bad and it was burning coolant. The levels were fine. I drove the car again after checking everything and it ran fine. My assumption was maybe some water in the gas?

Now backtrack since I purchased the car in april of 2011, whenever I would go into reverse sometimes it would not lock in and I would have to slowly back out on the clutch and pull back of the shifter until it would click into reverse. No issue at all, just something I thought was normal as I never had a manual car before. The gears would also grind in some occasions when going from 1st to 2nd gear while accelerating hard. Thought maybe it was operator error in the beginning but now I doubt it because I know how to drive a manual, I raced motorcross for years, have a street bike, and now drive a semi truck aswell.

Now fastfoward to yesterday, I am driving on my way to a funeral, and my car is just lacking power, I had to downshift to 3rd gear up hills that I normally could do them in 4th. My car also sound like it may have been missing just a little bit. No smoke, just the power loss. No check engine light and the issues continued all day and continue today. My car also grinded going into first gear this morning which it never did before.

Any ideas? I'm thinking of changing the spark plugs and running some sea foam throught it.
Thanks guys!
 
Are you sure this is transmission related? What is the rpm and throttle position when you have this loss of power? I would clean the air filter or replace it, clean the MAF, and check the wire harness going to the MAF for any weak connections. The latter requires you to cut open the loom, and trace each wire from the MAF back to the ECU. With the car running gently tug and move each wire over every inch of the harness. If your idle changes at all then you have a bad section of wire. I've seen this issue create all kinds of symptoms from stumbling amd idle issues to CELs.
 
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