N52b25 e93 Misfire after 1.5km travel on cold start

Binaryguy · 03-05-2018, 09:13 PM

Hi Guys,

The story starts 2 years back where the car was stored away and has not been driven for 2 yrs straight. Not even start up. Decided to revive the car and change the battery and bring it in to a oil change. Just after oil change then 20km drive the cel light came on. It was the o2 sensor, replaced and no more CEL. So i though ok it is going to be alright now. Give it a bit of a drive the fuel consumption was insane at 15-16l/100km on half city/highway and i get misfire every morning at the same intersection for 30 seconds. I replaced the fuel injector,MAF,plugs,belt, engine flush. Running out of idea now. Did a code scan and nothing comes out. Checked the fuel trim was negative 7-10 on bank 1 and normal on bank 2.
I have attached pictures and video if that ould be helpful to assist me to diagnose the issue. Thank you.

https://click.email.vimeo.com/?qs=ef...8df13ea0c9938b

GORDON.M3 · 03-05-2018, 09:15 PM

Did you replace your coil packs?

Binaryguy · 03-05-2018, 09:26 PM

No i have not replace the coil pack. I swapped the coil pack and tested each of them and they seems to be working ok.

GORDON.M3 · 03-06-2018, 11:36 AM

They "seem" to be working... They are a maintenance thing for the E90, I recommend replacing them every 80,000km. But there is likeliness that one might fail early. Change all 6 they aren't expensive anyways.

Binaryguy · 03-06-2018, 03:37 PM

Ok would coil caused high fuel consumption? Thanks

Xencer · 03-06-2018, 07:37 PM

1.5 km of travel after a cold start may be enough time for the engine to switch from open loop mode to closed loop mode in regards to engine control strategy after the A/F ratio sensors reach operating temperature which is 1200 degrees. If you had an O2 sensor replaced, it would be behind the catalytic converter because I know BMW uses A/F ratio sensors upstream so I believe you have an A/F sensor is bias rich on bank 1 which includes the first 3 cylinders. - 11% is considered fine for some vehicle makes but will trip a code when the combined ST and LT fuel trims pass a threshold

If you want more help diagnosing the problem, send me the A/F voltage readings when your engine reaches operating temperature or when the problem occurs and we can determine if this is your issue.

Binaryguy · 03-07-2018, 04:18 PM

Quote:

Originally Posted by Xencer

1.5 km of travel after a cold start may be enough time for the engine to switch from open loop mode to closed loop mode in regards to engine control strategy after the A/F ratio sensors reach operating temperature which is 1200 degrees. If you had an O2 sensor replaced, it would be behind the catalytic converter because I know BMW uses A/F ratio sensors upstream so I believe you have an A/F sensor is bias rich on bank 1 which includes the first 3 cylinders. - 11% is considered fine for some vehicle makes but will trip a code when the combined ST and LT fuel trims pass a threshold

If you want more help diagnosing the problem, send me the A/F voltage readings when your engine reaches operating temperature or when the problem occurs and we can determine if this is your issue.

Right will do when it happens tomorrow morning. Thanks

Binaryguy · 03-08-2018, 06:33 PM

Hi guys,

See below parameter for

Idle :
https://ibb.co/fTQm8S

Decelaration :
https://ibb.co/fTQm8S

Parameter log :
https://ufile.io/mfxq2

Any idea whats going on?

03-05-2018, 09:13 PM	#1
Binaryguy New Member 0 Rep 8 Posts Drives: E93 N52 325i Join Date: Feb 2018 Location: Melbourne, Australia iTrader: (0)	N52b25 e93 Misfire after 1.5km travel on cold start Hi Guys, The story starts 2 years back where the car was stored away and has not been driven for 2 yrs straight. Not even start up. Decided to revive the car and change the battery and bring it in to a oil change. Just after oil change then 20km drive the cel light came on. It was the o2 sensor, replaced and no more CEL. So i though ok it is going to be alright now. Give it a bit of a drive the fuel consumption was insane at 15-16l/100km on half city/highway and i get misfire every morning at the same intersection for 30 seconds. I replaced the fuel injector,MAF,plugs,belt, engine flush. Running out of idea now. Did a code scan and nothing comes out. Checked the fuel trim was negative 7-10 on bank 1 and normal on bank 2. I have attached pictures and video if that ould be helpful to assist me to diagnose the issue. Thank you. https://click.email.vimeo.com/?qs=ef...8df13ea0c9938b Last edited by Binaryguy; 03-05-2018 at 09:40 PM..
	Appreciate 0 Tweet Quote

03-05-2018, 09:15 PM	#2
GORDON.M3 Brigadier General 1423 Rep 3,002 Posts Drives: E92 M3 • F25 X3 M-Sport Join Date: Dec 2013 Location: LAX/YYZ/NRT iTrader: (11)	Did you replace your coil packs? __________________ INSTAGRAM: GORDON.M3 North American Mr12Volt Carplay/Android Auto Distributor DINAN \| EVOSPORT \| VAC \| ARP \| RD SPORT \| NEEZ \| EIBACH \| CSF \| IND \| BILSTEIN \| KLASSEN \| BREMBO \| ENDLESS \| BBS \| BPM SPORT \| PROJECT MU \| EVENTURI
	Appreciate 0 Quote

03-05-2018, 09:26 PM	#3
Binaryguy New Member 0 Rep 8 Posts Drives: E93 N52 325i Join Date: Feb 2018 Location: Melbourne, Australia iTrader: (0)	No i have not replace the coil pack. I swapped the coil pack and tested each of them and they seems to be working ok.
	Appreciate 0 Quote

03-06-2018, 11:36 AM	#4
GORDON.M3 Brigadier General 1423 Rep 3,002 Posts Drives: E92 M3 • F25 X3 M-Sport Join Date: Dec 2013 Location: LAX/YYZ/NRT iTrader: (11)	They "seem" to be working... They are a maintenance thing for the E90, I recommend replacing them every 80,000km. But there is likeliness that one might fail early. Change all 6 they aren't expensive anyways. __________________ INSTAGRAM: GORDON.M3 North American Mr12Volt Carplay/Android Auto Distributor DINAN \| EVOSPORT \| VAC \| ARP \| RD SPORT \| NEEZ \| EIBACH \| CSF \| IND \| BILSTEIN \| KLASSEN \| BREMBO \| ENDLESS \| BBS \| BPM SPORT \| PROJECT MU \| EVENTURI
	Appreciate 0 Quote

03-06-2018, 03:37 PM	#5
Binaryguy New Member 0 Rep 8 Posts Drives: E93 N52 325i Join Date: Feb 2018 Location: Melbourne, Australia iTrader: (0)	Ok would coil caused high fuel consumption? Thanks
	Appreciate 0 Quote

03-06-2018, 07:37 PM	#6
Xencer Enlisted Member 11 Rep 37 Posts Drives: 2011 328i Join Date: Jan 2018 Location: Atlanta iTrader: (0)	1.5 km of travel after a cold start may be enough time for the engine to switch from open loop mode to closed loop mode in regards to engine control strategy after the A/F ratio sensors reach operating temperature which is 1200 degrees. If you had an O2 sensor replaced, it would be behind the catalytic converter because I know BMW uses A/F ratio sensors upstream so I believe you have an A/F sensor is bias rich on bank 1 which includes the first 3 cylinders. - 11% is considered fine for some vehicle makes but will trip a code when the combined ST and LT fuel trims pass a threshold If you want more help diagnosing the problem, send me the A/F voltage readings when your engine reaches operating temperature or when the problem occurs and we can determine if this is your issue.
	Appreciate 0 Quote

03-08-2018, 06:33 PM	#8
Binaryguy New Member 0 Rep 8 Posts Drives: E93 N52 325i Join Date: Feb 2018 Location: Melbourne, Australia iTrader: (0)	Hi guys, See below parameter for Idle : https://ibb.co/fTQm8S Decelaration : https://ibb.co/fTQm8S Parameter log : https://ufile.io/mfxq2 Any idea whats going on? Last edited by Binaryguy; 03-08-2018 at 06:53 PM..
	Appreciate 0 Quote