Replaced the engine now the transmission is not engaging
2007 Mazda Mazda3

Replaced the engine now the transmission is not engaging

(2007 Mazda 3)
I recently replaced the engine. Now the car won't move. It starts and engine runs but when trying to get the car to go in drive nothing happens, the car just revs up. But the tires do lock so when it'd in gear I can't rotate the tires. I'm sure I reattached the drive train and the fluid is fine. I didn't remove the transmission at all just the engine the car is a 2007 Mazda 3
Tags: mazda, mazda3
3 answers & 10 comments
Popular Answer
on February 27, 2018
Did the torque converter remain in it’s proper place the whole time during the engine swap?

I certainly hope it did!

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on February 27, 2018
Yes, we didn't remove anything but the engine.
on February 27, 2018

Ok - however - ‘IF’ the torque converter slipped out of place, even just a tiny bit, while the engine was removed - then engine was installed - well you get the picture.. Transmission problems WILL result.... Maybe that isn’t the case..

Good luck with it!
on February 27, 2018
Well say the transmission is making a buzzing noise, under the car, when it shifts gears. What does that sound like?
on February 27, 2018

If it will not move - how is it shifting gears?

In any event - that buzzing noise is a mechanical problem - possibly torque converter damage. Also - possibly transmission pump damage as well (if pump is directly behind the converter) I’m not sure about that part.

This is only speculation, of course - *hands-on* inspection / testing will be required.

Let me know how it goes.
on February 27, 2018

I just had another thought - make SURE both axle shafts are still inserted into the transaxle!

IF one of the axle shafts has popped out - car won’t move.

It’s basically guesswork here online..

Again - good luck!
on February 27, 2018
I meant when I put it in gear and go from drive to reverse and what not. The tires rotate the way they should it's just that the car isn't making them turn I have to manually turn the wheels.
on February 27, 2018

Review what has already been posted .. Seek *hands-on* help - if needed.
on November 17, 2019
Hey I figured out what I did by using a 2010 2.0l the flywheel was flat and didn’t seat the TC into the pump at all!
on November 30, 2019

That makes sense..

Thanks for posting the tip.
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on February 27, 2018
Did the torque converter remain in it’s proper place the whole time during the engine swap?

I certainly hope it did!

Sign in to reply
on February 27, 2018
Yes, we didn't remove anything but the engine.
on February 27, 2018

Ok - however - ‘IF’ the torque converter slipped out of place, even just a tiny bit, while the engine was removed - then engine was installed - well you get the picture.. Transmission problems WILL result.... Maybe that isn’t the case..

Good luck with it!
on February 27, 2018
Well say the transmission is making a buzzing noise, under the car, when it shifts gears. What does that sound like?
on February 27, 2018

If it will not move - how is it shifting gears?

In any event - that buzzing noise is a mechanical problem - possibly torque converter damage. Also - possibly transmission pump damage as well (if pump is directly behind the converter) I’m not sure about that part.

This is only speculation, of course - *hands-on* inspection / testing will be required.

Let me know how it goes.
on February 27, 2018

I just had another thought - make SURE both axle shafts are still inserted into the transaxle!

IF one of the axle shafts has popped out - car won’t move.

It’s basically guesswork here online..

Again - good luck!
on February 27, 2018
I meant when I put it in gear and go from drive to reverse and what not. The tires rotate the way they should it's just that the car isn't making them turn I have to manually turn the wheels.
on February 27, 2018

Review what has already been posted .. Seek *hands-on* help - if needed.
on November 17, 2019
Hey I figured out what I did by using a 2010 2.0l the flywheel was flat and didn’t seat the TC into the pump at all!
on November 30, 2019

That makes sense..

Thanks for posting the tip.
on February 27, 2018
Manual or auto?

Alex
Sign in to reply
on February 27, 2018
on November 29, 2019
I too changed the engine on mine with a 2010 2.0l which I didn’t realize used the 5spd automatic transmission flywheel which is basically flat and doesn’t seat the torque converter into the pump at all! So no damage was done I just had to yank the transmission out to change the flywheel back to the 4spd AT style! Hope you figured it out also! I realize that this is a old question but hope it helps future DIYers
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