29D0 misfiring cylinder 4 after MHD stage 1

[thewubwub]

Hi all, just flashed to MHD stage 1 91 octane map. Starts up just fine driving a low speeds and RPM is fine as well. Once I go WOT, SES comes on, the car loses a ton of power obviously, and starts shaking really badly.

MHD tool says:
-DME active codes-
29D0 Misfirings, cylinder 4

Going to flash back to the stock map for now, is changing spark plugs the only solution? Is there anything else that I need to change/look out for?

Thanks guys

[Dat Aus]

How many miles on your car?

Spark plugs should be changed prior to tuning. It will more than likely be a coil pack though. Swap the coil pack on cylinder 4 to another cylinder and see if the misfire follows it. If it does, then change the coil (ideally, change all 6. They're cheap).

If the misfire stays on cylinder 4 even after swapping the coil, then it is possible that it is caused by the spark plugs. As I said, you really should have changed them prior to flashing the car. If it's not the spark plug or coil, it's probably the injector.

[alp135]

I just flashed too same thing but cylinder 5 was a coil for me

[thewubwub]

Originally Posted by Dat Aus

How many miles on your car?

Spark plugs should be changed prior to tuning. It will more than likely be a coil pack though. Swap the coil pack on cylinder 4 to another cylinder and see if the misfire follows it. If it does, then change the coil (ideally, change all 6. They're cheap).

If the misfire stays on cylinder 4 even after swapping the coil, then it is possible that it is caused by the spark plugs. As I said, you really should have changed them prior to flashing the car. If it's not the spark plug or coil, it's probably the injector.

Theres about 86k miles on the car atm.

Thanks for the advice. I think I may just end up changing all the coil packs and plugs while I am at it.

[thewubwub]

Originally Posted by alp135

I just flashed too same thing but cylinder 5 was a coil for me

Did you get it all sorted out? How's the car now?

[alp135]

Runs great now! Did all coils since there original with 70k

[thewubwub]

Originally Posted by alp135

Runs great now! Did all coils since there original with 70k

That's great to hear! You must be enjoying the new found power after the flash too

[alp135]

I love it! Enjoy yours

[PREM]

Originally Posted by alp135

Runs great now! Did all coils since there original with 70k

Hello all.
I have a 320i 2006 e90.
the error codes are 29D0 & 29CC.
should i change the catalytic converter or just the sensors?

thank you.