[nsjames]

well if you really want to slam some injectors in it FCP has GB remans for like $35 a pop

https://www.fcpeuro.com/products/bmw...ctor-852-12238

they're cheaper on rock auto.

if you have one bank that is way out of whack on the fuel trims then it may have an injector problem, or it may be the O2 sensors aren't as good as you think.
agree that INPA is a PITA to install. I have a dedicated laptop for it so updates and such don't bork it.

it's waaaaayyyyy better for diagnostics than Carly though.

[Fb2017]

Waiting on the latest daten files now.. 3 hours of waiting to go (don't feel like paying for mega file hosting service) 21 done.. 3 to go

Then fingers crossed that this works .. INPA that is

[nsjames]

also, not to add to your geek workload, but get ISTA/D as well.

it's not as powerful as inpa, but it makes performing maintenance related resets tons easier, it works well for diagnostics with a much easier interface and it also has some basic service information in there, in addition to creating diagnostic plans based on symptoms.

[Fb2017]

Ista/D .. isn't that to program newer cars? And doesn't that require an ICOM cable?

I'm a bit confused between ista p and d

Thanks for the info!

[Fb2017]

Hello, so I finally got INPA working (mostly) after a solid day of trial and error. In my excitement I had the genius idea of resetting adaptations beforehand to see if there would be any improvement. I played with the idle (didn't improve/worsen anything). reset most adaptations and took some pictures of the various screens. The fuel trims would probably need more time to be set properly so I'll be putting some miles on the car in the coming days. Attached are some of the pictures I took. Just keep in mind that a lot has been reset so you're looking at really short term numbers. Long term trim would not be set yet.


Once I drive it and set a LTFT value which pages would you like to see? Thank you

[Fb2017]

Heres the pics..

[Fb2017]

And more

[Fb2017]

Second last one

[Fb2017]

Last one

[nsjames]

Originally Posted by Fb2017

Ista/D .. isn't that to program newer cars? And doesn't that require an ICOM cable?

I'm a bit confused between ista p and d

Thanks for the info!

ista D is for the older cars, it will work with your KDCAN cable.

ista P is ICOM only IIRC. Not sure, haven't messed with it.

nothing looks terribly out of place in your inpa stuff. I will caution you that resetting adaptations can cause you serious issues with the car, so don't go doing it all willy nilly.

fuel trims might be a touch high on the one bank at %5, might indicate an injector in the early stages of failure maybe?

it's a puzzle for sure as nothing jumps out at me.

[Fb2017]

I suspect the issue is with cyl 5.

I'm having the injectors tested/cleaned locally tomorrow. Hope it clarifies things

[nsjames]

I missed that one that showed cyl 5 was rough.

swap the injector from cyl5 with cyl1.

if your rough running follows the injector it's a good sign that it's failing.

[Fb2017]

Figure I'd post an update. Injectors were bench tested and injector 5 performed poorly in their idle test.(rapid open close test) Sprayed half the fuel of the rest of them. Under load or WOT it worked fine. The shop tried to clean it out but it still performed poorly compared to the rest. They suspect the spring inside is shot. Picture below is after cleaning. I ordered one injector in the hope of it remedying my issue. Worst case I have to buy 3 or 6. I'll update once they are back in the car Thursday/Friday

[nsjames]

you can do just one as long as they all are within spec.

n52 stuff isn't like n54 stuff where you have to code injectors or anything.

[sprp85]

Wish you the best on chasing this issue.

I've had mine acting up randomly once in a while, very similar to your case.

It would be interesting to see if the injector replacement cures it.

[Fb2017]

And now for
The moment you've all been waiting for!

The injector replacement has made a huge difference. The car idles smooooth well I'd give it an 8/10 compared to the 2/10 it was before.

I only changed the one faulty injector as the car is able to account for up to %15 difference in flow rates between injectors. Had I changed all six I'm sure it would be smooth as silk.. i just didn't want to spend those kinds of funds after burning so much time and money chasing this ghost of an issue.

To everyone thats chasing a similar issue heres my advice for narrowing the issue down.

-check for codes (my case I had none)
-check/replace/swap around the basics like coils and plugs see if the problem follows
-If no change or not enough change check for vacuum leaks
-get some diagnostic software/scanner. INPA made life easy since when in doubt I just had to look for the parameter that was in the red lol. So if you don't understand half of what you're looking at do what I did!
-look at fuel trim info to see if you're running rich or lean (google is your friend for understanding what this is)
-check maf readings,O2 readings, injection time, spark time and run engine smoothness test. Odds are one or a few cylinders will be in the red if your car has the shakes. Focus on there.
- if you have the option get your injectors tested or cleaned by someone that has proper equipment. (Best $100 I spent) Every specialist I talked to always told me injectors on the N52 do not fail and that swapping them is a waste of time and money. My situation is proof that thats bs. My injector was shot beyond salvation. Under WOT it worked fine but when idling it was sluggish to respond and low flowing.
-if the injectors pass then its probably an issue with either fuel delivery or return.

Suck(air) bang(spark) blow(gas)
Hah

Aside from the tips I do think that my issue varies from the symptoms of the Eccentric Shaft Sensor. From what I gather when the sensor fails, you get an erratic and visible misfire that you can see on the tach. In my case one bank of the engine was compensating for the other. It thought it was working normally and it kept the revs steady. All the extra fuel combusting was making the car shake and exhaust pop. Just something to look out for.

Back to my story. Upon installing the new injector I decided to reset fuel trim info among a few other things. In the short term the car has been excellent. I will return once I put some miles on the car and after it has a chance to recalibrate its trim information.

Thank you!

In case anyone was wondering the new injector was an updated part. Same part number just few noticeable changes ex. Nozzle design. No issues after adaptations were reset. Prior to doing so car was missing a bit and threw a code

[nsjames]

fantastic.

[Fb2017]

Out of curiosity does anyone know what this means?

Top two categories are out of spec.

[adam_c]

Something to do with voltages?

[nsjames]

maybe sensor reference voltages?

probably supposed to be 5 volts exactly. I probably wouldn't worry about another .1 v if the car runs correctly.