2009 X5 35D spuddering

[ifly4money]

Hello everyone,
I have a 2009 X5 35D with just over 100K miles. It has the EGR delete with the AA Rodriquez down pipe and a stage 2 tune in it. I have had that setup for about 30k and it's been great! Anyway, I started to notice a very slight spudder about mid throttle and would go away if I went full throttle or let off. Now, it's idling rough and almost seems as if it is down a cylinder. I have no codes, no CEL, and no real clue where to begin. Anyone have any suggestions? Thanks for the help!

[ard]

What does your 'tuner' say?




And is 'spuddering' a cooking technique with potatoes?????

[ifly4money]

I'm trying to get a time that the tuner can remote hook up and see if he sees anything. However, give the description (feels like partial power on 1 cylinder intermittently =spudder). His thought is a fuel injector, but can't explain no codes nor pending codes. I suppose the pertinent question is. Has anyone seen a fuel injector problem that did not have any fault codes associated with it?

[Stockx5]

Ive had this issue with my car where CEL comes on without any errors on Rheingold. the tuner had to revert to another version of their tune where it would allow the codes to show.

I have read this on the e90 forums as well, it appears the tune routinely erases certain codes to keep the cel from coming on. Im not sure exactly how it works but you are left troubleshooting your car blindly.

Please do let us know what method the tuner uses to try to access the errors as i do not think there is any "back door"

I had my car take over 650 miles to show a code as well so how long have u driven it since it began spuddering?

[ifly4money]

I did wonder with the tune, if codes were being inhibited somehow. Obviously, the exhaust codes would be inhibited, because all of it is gone now. I wonder if the exhaust is where a code would be generated. I will be sure to ask him. It has barely been noticeable, until now. Today, I am getting a rough idle and a noticeable loss of power. But, still no CEL and no error codes. I will give an update when I get with the tuner, unless anyone has another idea of what to try/check.

[robnitro]

If you haven't checked your plastic partition on pass side in engine bay, i wonder if it has been cracked and this causes injector 5and/or 6 to get corroded electrically. I am on my phone so I can't easily find the thread about it, but in my car I had to replace 5 and 6, both showing less than 200k to ground (ground faults) which occasionally caused stumbles until I could barely start it

[Stockx5]

Originally Posted by robnitro

If you haven't checked your plastic partition on pass side in engine bay, i wonder if it has been cracked and this causes injector 5and/or 6 to get corroded electrically. I am on my phone so I can't easily find the thread about it, but in my car I had to replace 5 and 6, both showing less than 200k to ground (ground faults) which occasionally caused stumbles until I could barely start it

yea this ^^

why don't you unplug the injectors one by one to see which one has any effect on how the engine runs.

and if you get no CEL and no codes while doing this we will be able to know if your tune is allowing those types of errors to show

[robnitro]

DIY: 335d M57 Fuel Injector Replacement diy injector replacement


Partitions plastic issue:
https://xoutpost.com/bmw-sav-forums/...ment-help.html
Also remove the engine cover and that foam might be moist, that's the culprit that keeps the injectors wet. I don't use my engine cover or the foam.