[mlouie2000]

325i N53, 2009 95000 miles

Hi, my car was misfiring throwing up a few error codes and an indie said to change the coils and plugs, which he did then it was still misfiring so he diagnosed injector/ cyl 1 & 6. I bought 2 genuine injectors from the dealer and a genuine knox sensor which was also showing an error. All this was replaced last month and recently the engine light came on and showing codes of

29CD - Combustio misfiring cylinder 1
2C7E - lambda probe behind catalytic converter, trimming control.
29D2 - Combustion Failure Cylinder 6.
29CC – Combustion Misfire On Several Cylinders.

the same codes as before things were replaced.
I will add that when you first drive the car and the light comes on, if you turn the engine off and restart the cat, the light stays off and the car runs fine

any ideas would be grateful

[Phil325i]

If you've had injectors leaking for a while, the excess fuel could have damaged the lambda sensor in the exhaust - hence the error code.

[Will_460cs]

It need a proper diagnostic from someone that understands the n53 as it’s a lot more complicated.

Do you know what brand/ model of spark plug and coil pack is fitted?

Have you checked to see if the coil packs are correctly seated on the plugs and the writing harness is checked.

We’re the get injectors coded?
(Ask your Indy)

Given that you have replaced one injector per bank are you running index 10/11 in cylinder 2,3,4,5 as you can’t run index 11 with in the same bank.

[Keith325i]

Originally Posted by Will_460cs

It need a proper diagnostic from someone that understands the n53 as it’s a lot more complicated.

Do you know what brand/ model of spark plug and coil pack is fitted?

Have you checked to see if the coil packs are correctly seated on the plugs and the writing harness is checked.

We’re the get injectors coded?
(Ask your Indy)

Given that you have replaced one injector per bank are you running index 10/11 in cylinder 2,3,4,5 as you can’t run index 11 with in the same bank.

How true is it regarding mixing injectors from previous revisions on the same bank? I’m running index 3,3,11 in bank 2 and 9,11,11 in bank 1 for at least 20k miles. I do plan to move the 11 to bank 2 purely out of caution.

[micdev42]

Originally Posted by Keith325i

How true is it regarding mixing injectors from previous revisions on the same bank? I’m running index 3,3,11 in bank 2 and 9,11,11 in bank 1 for at least 20k miles. I do plan to move the 11 to bank 2 purely out of caution.

Do you have any errors?
Today I've just replaced a single leaking index 7 injector (cylinder 2) with a new index 11 so that I have 11,11,7 on bank 1 and 7,7,7 on bank 2. The car is running better than it's ever run before (I bought it September 2019). N53 325i. It's a 16 year old car. I still have a P0174 error (System Too Lean (Bank 2)) but I can live with that I think. Yes, maybe I should have index 11 on all cylinders, but that's not economically viable for me. I'll see how I get on.

[Keith325i]

Originally Posted by micdev42

Do you have any errors?
Today I've just replaced a single leaking index 7 injector (cylinder 2) with a new index 11 so that I have 11,11,7 on bank 1 and 7,7,7 on bank 2. The car is running better than it's ever run before (I bought it September 2019). N53 325i. It's a 16 year old car. I still have a P0174 error (System Too Lean (Bank 2)) but I can live with that I think. Yes, maybe I should have index 11 on all cylinders, but that's not economically viable for me. I'll see how I get on.

I have some codes yeah. 3104 smooth running and most recently P2188 running rich bank 1 at idle. No issues when driving, its only noticeable hiccups during a cold start, typical leaking injector symptoms. I can see myself replacing at least 1 in the near future.

[Will_460cs]

It in the official bmw information - I posted it while back, if you want to search my profile there will be a l link to it - I think I posted the n54 one as it was more freely published but the info is the same for n53.


Index 10 &11 mix together but not prior - and this was in per bank basis ie cyl 1-3 , 4-6- so it will be to do with flow rates as that what is coded per bank and guidance was per bank.

There was a recommendation that the engine has matched injectors but per bank is the way that the ecu manages flow/rich/lean conditions so personally given the complexity’s I would stick to it.

[Will_460cs]

Originally Posted by Keith325i

I have some codes yeah. 3104 smooth running and most recently P2188 running rich bank 1 at idle. No issues when driving, its only noticeable hiccups during a cold start, typical leaking injector symptoms. I can see myself replacing at least 1 in the near future.

If it’s stuttering on startup that’s really not good..

You are fuel washing your cyclinders- when the engine is turned off pressure built in the fuel rail is coming out of the injector.

This will dry the cylinder of lubrication and thin the oil. It can cause a myriad of problems if left most of them engine killing.

[Will_460cs]

Originally Posted by micdev42

Do you have any errors?
Today I've just replaced a single leaking index 7 injector (cylinder 2) with a new index 11 so that I have 11,11,7 on bank 1 and 7,7,7 on bank 2. The car is running better than it's ever run before (I bought it September 2019). N53 325i. It's a 16 year old car. I still have a P0174 error (System Too Lean (Bank 2)) but I can live with that I think. Yes, maybe I should have index 11 on all cylinders, but that's not economically viable for me. I'll see how I get on.

Are your injectors coded to the ecu with correct flow rates?

[micdev42]

Originally Posted by Will_460cs

Are your injectors coded to the ecu with correct flow rates?

Yes. For my sins I Use INPA. 576, 201 are the new figures. Not that different to one of my existing index 7's: 577, 203.
I left the original NGK spark plugs in while I did a shortish test drive. They are about 20k miles old. The car drove well.
After that I pulled them and had a look. They didn't seem that bad - lightish grey, no obvious electrode wear etc. - but I put in a new set of NGK ZKBR7A-HTU-GS spark plugs as I already had them.
A few hundred miles ago I replaced all the (Bosch) coils with the much maligned new Bosch coils. No difference.
As I said, that car is now a pleasure to drive for the first time since I've owned it.
I will be interested to see the fuel consumption on a long trip as all my current driving is short, slowish dodging potholes / tractors on Herefordshire roads. The car is a second car so doesn't get that much use.

[micdev42]

I forgot to say that I reset all adaptions after coding the injector (and reset the throttle calibration by holding the pedal to the floor for 30 secs). I've done less than 20 miles since. I assume it will take a while for the engine management computers to sort themselves out.

[Will_460cs]

Originally Posted by micdev42

I forgot to say that I reset all adaptions after coding the injector (and reset the throttle calibration by holding the pedal to the floor for 30 secs). I've done less than 20 miles since. I assume it will take a while for the engine management computers to sort themselves out.

If you haven’t already grab the inpa 2.023 loader for the engine

I wasn’t aware of reseating throttle pedal adaptions this way.l - I’ll look into it.

I always reset adaptation through Inpa.

[micdev42]

Originally Posted by Will_460cs

I wasn’t aware of reseating throttle pedal adaptions this way.l - I’ll look into it.
I always reset adaptation through Inpa.

Well I initially reset all adaptations - using INPA - and the car sounded terrible, had the big half yellow engine sign on the dash etc. and would only move in limp mode (about 10 mph!). Did a google and found the tip about the throttle pedal: ignition on, engine off, press throttle to floor, hold for 30 secs. Start car normally and hey presto all good.

[micdev42]

Originally Posted by Will_460cs

If you haven’t already grab the inpa 2.023 loader for the engine

The 'About' dialog for my INPA says "INPA - Loader v5.0.6". That sounds more recent. Or do I specifically need the old 2.023 version?
Just had another look...
The title in the window says: "INPA - Loader: MSD80 Version 1.001". So a bit confusing. But I assume that I need 2.023...

[micdev42]

Another curious thing - that may help someone - was that even though injector 2 was leaking (plug 2 was wet when I pulled it after leaving the car standing overnight), I never got any misfire codes for that cylinder! But I did get the P0174 error (System Too Lean (Bank 2)) - even though C2 is bank 1.
On the other hand this may be no help at all!

[Will_460cs]

Originally Posted by micdev42

The 'About' dialog for my INPA says Loader v5.0.6. That sounds more recent. Or do I specifically need the old 2.023 version?

Inpa 5.06 is the general release - you do not need to change this

2.023 loader is the specific files in INPA for the MSD80/81 ECU, when you select the engine in Inpa look at the top left corner and it will say the loader version.

V2.023 is easily obtained from the Bimmerproffs site.

[micdev42]

Originally Posted by Will_460cs

V2.023 is easily obtained from the Bimmerproffs site.

Great. Thanks for the tip. I'll have a go now.

[Will_460cs]

Originally Posted by micdev42

Another curious thing - that may help someone - was that even though injector 2 was leaking (plug 2 was wet when I pulled it after leaving the car standing overnight), I never got any misfire codes for that cylinder! But I did get the P0174 error (System Too Lean (Bank 2)) - even though C2 is bank 1.
On the other hand this may be no help at all!

It s a complicated engine, I dont claim empirical knowledge. However it could easily be that bank 2 can inject enough fuel to compensate for bank one overfeuling.

It could also be damaged pre cat lama probe. - you can see data in inpa and ISTA on lamda probes...

+ host of other things.

My preference is to fix the things that I know are obviously wrong first then work from there

[Will_460cs]

Originally Posted by micdev42

Well I initially reset all adaptations - using INPA - and the car sounded terrible, had the big half yellow engine sign on the dash etc. and would only move in limp mode (about 10 mph!). Did a google and found the tip about the throttle pedal: ignition on, engine off, press throttle to floor, hold for 30 secs. Start car normally and hey presto all good.

Thats entirely what I would expect if resets adaptions. if you wipe all adaptions you can throw disc lights too! as you are reseting the flywheel adaptation bit, the first thing to do after clearing adaptation is let the car idle for 5 mins.

Then drive it 62mph and let the car coast to a stop - this will reset the flywheel adaptation. ( look up the adaptation bit set block in INPA to confirm this is done. Then its a case of letting the car idle for 5 mins and then not mid to long journeys at different load levels. all this will readapt the engine.


I don't think on this engine pressing the throttle pedal is doing anything.

[micdev42]

Originally Posted by Will_460cs

Thats entirely what I would expect if resets adaptions. if you wipe all adaptions you can throw disc lights too! as you are reseting the flywheel adaptation bit, the first thing to do after clearing adaptation is let the car idle for 5 mins.

Then drive it 62mph and let the car coast to a stop - this will reset the flywheel adaptation. ( look up the adaptation bit set block in INPA to confirm this is done. Then its a case of letting the car idle for 5 mins and then not mid to long journeys at different load levels. all this will readapt the engine.

OK thanks. A lot for me to do...

[micdev42]

Originally Posted by Will_460cs

I don't think on this engine pressing the throttle pedal is doing anything.

Well that is all that I did and the car then ran normally. As I said it was undriveable before that.
Have a look at this post:
https://www.e90post.com/forums/showthread.php?t=577760

[Keith325i]

@micdev42 where did you get your injector out of curiosity? would you trust the used injectors from Ebay UK?