HELP!! Pulsing issue / jerking

[atermechi]

Hello everyone,

I have been noticing a recent issue with my m3. In 3rd gear, around 2k to 4k rpm the the car almost feels like its pulsing and jerking until it reaches 4k and my speed is not to low for the gear (around 30 mph). I belive the same issue happens in all the other gears bu i feel it the most in 3rd. Also my car is a 6MT. I had my car tuned last year and recently just put in test pipes but i did not re-tune for cat less, maybe this can be the issue? Any help will be appreciated.

Thanks guys

[atermechi]

anyone?

[HP Autosport]

Originally Posted by atermechi

Hello everyone,

I have been noticing a recent issue with my m3. In 3rd gear, around 2k to 4k rpm the the car almost feels like its pulsing and jerking until it reaches 4k and my speed is not to low for the gear (around 30 mph). I belive the same issue happens in all the other gears bu i feel it the most in 3rd. Also my car is a 6MT. I had my car tuned last year and recently just put in test pipes but i did not re-tune for cat less, maybe this can be the issue? Any help will be appreciated.

Thanks guys

What if you were to go back to your OE tune? If the problem goes away, you have just found the issue.

Who tuned it if you don't mind sharing.

[tom @ eas]

Originally Posted by atermechi

Hello everyone,

I have been noticing a recent issue with my m3. In 3rd gear, around 2k to 4k rpm the the car almost feels like its pulsing and jerking until it reaches 4k and my speed is not to low for the gear (around 30 mph). I belive the same issue happens in all the other gears bu i feel it the most in 3rd. Also my car is a 6MT. I had my car tuned last year and recently just put in test pipes but i did not re-tune for cat less, maybe this can be the issue? Any help will be appreciated.

Thanks guys

What tune are you using?

[808MGuy]

I'm guessing the fact that you never updated your tune to account for the removal of the cats would be an issue unless you have something else to defeat the SES warning.

[atermechi]

Originally Posted by 808MGuy

I'm guessing the fact that you never updated your tune to account for the removal of the cats would be an issue unless you have something else to defeat the SES warning.

Turned out the hubs on my spacer broke and was causing the pulsing and jerking issue.

[atermechi]

Originally Posted by HP Autowerks

What if you were to go back to your OE tune? If the problem goes away, you have just found the issue.

Who tuned it if you don't mind sharing.

The OE tune is awesome, it turned out to be broken spacers. Car was tuned by OE tuning over a year ago. i need to go back and re-tune for cat-less to squeeze put some more power.

[atermechi]

Originally Posted by tom @ eas

What tune are you using?

broken hubs on the spacer was the issue, i am running OE tune.

thanks for the reply!!

[BIGW0RM]

What Spacers?

[atermechi]

Originally Posted by ILSMKU

What Spacers?

I think they where some cheap ones, i had h&r in the front and it was fine. I am not sure what brand the rear was. I have h&r all around now and should not be an issue.