[Nexus313]

Hi guys, I have a 2009 BMW 335i MSport. The previous owner had a JB4 on it, but I usually run MAP 0 as i'm still planning on getting FBO, and doing major preventative maintenance before I jump into using the tune just to be safe.

My problem is; when I WOT the car in map 0 a couple of times, when warm.. (3-4 times).. And I come to a stop after or to park, the car misfires shakes and stumbles with no check engine OR it misses hard while driving and the check engine pops up (occasionally).

UPDATE: Removed JB4 completely. Still having these issues. Progressively getting worse as time goes on and the car almost always misfires and shakes at a stop. All I get is O2 related codes, or at worst if I let it misfire for long enough; I get limp mode and some combustion misfires (always bank 1 cylinder 1-3). The car acts up the most usually when its hot (120 C, 250 F), and low fuel. It's pretty clear that the O2's are adjusting due to the AFR and the car is running rich. (AFR has too much fuel) Gas consumption pretty terrible right now (15MPG) No WG rattles. The car has fairly low mileage at almost 110,000 km (68,000 miles)

Here are the codes I'm getting most the time after clearing and testing multiple times the two codes in bold are the ones mostly present:
I'm still getting the following: [2C7E, 2C2B, 2CAA, 2C2D, 2C3D(o2 codes)], [2A2B, 29E0 (fuel mixture control codes)], [29D9, 29CC, 29CD, 29CE, 29CF (BANK 1 FUEL COMBUSTION MISFIRES)]

Shadow codes (always present): 2FCA, 2FDA, 2FDB [High pressure fueling related]

Before I would get 2C9C code, which is the heating in the o2 sensor gone bad, but I changed the bank 1 O2 sensor PRE-CAT and that code went away for good.

The car also makes a slight tapping sound (SOMETIMES) near the intake manifold here's a video of the sound:

Here's what I've done so far:
6 NEW OEM BMW Index 12 Fuel Injectors
6 NEW Spark Plugs (Bosch)
6 NEW Ignition Coils (Bosch)
Bank 1 O2 Sensor PRE-CAT [AFTERMARKET CHINA SENSOR, Going to replace with OEM bosch again]
Smoke tested for vacuum leaks, no leaks.
Oil Change.

I'm narrowing down my problems to the following:

1) JB4 Old board, Needs new board + Firmware update - Removed JB4 completety (It's taking way too long to ship!), still no help for me
2) High pressure fuel pump + HPFP Sensor
3) Low pressure fuel pump + LPFP Sensor
4) Downpipe gaskets too old/rusted (Previous owner had catless downpipes, could have messed up installation at the downpipe gasket area when restoring back to stock downpipes (CHECK & REPLACE BOTH the ones that connect from downpipe to turbo and from downpipe to exhaust!)
5) V Clamp holding downpipe to converter not on properly. (Previous Owner could have messed up when restoring back to stock downpipe and didn't care to fix and just sold the car)
6) Bad Diverter Valve
7) Bad Charge Pipe
8) Backwards O2 Sensor
9) Carbon Intakes Clogged
10) Fuel Pressure Regulator/Fuel Filter
11) Change all vaccum lines (Smoke tested already, no leaks.)
12) Bank 1 Pre/Post catts O2 (I replaced bank 1 O2 PRECAT, but it was a cheap aftermarket china one that worked alright for a week or so, going to replace with OEM now)
13) Bad/Dirty Air intake
14) ECU messed up and needs replacing or grounding from O2 Wiring to ECU is bad. (Probably the worst, most expensive scenario if this happened)
15) I'm starting to think the INPA software I used when doing injectors was incorrect. I can't seem to find the MSD81 on inpa option, and my ECU is MSD81, I was able to code the injectors fine with MSD80 option selected and I thought it was alright but maybe the values I put in didn't sync with the DME properly (?) - Going to try using Rheingold software to RE-code the injectors again.
16) Flash software (I've used MHD to flash back to stock. No difference. I might try flashing an actual MHD flash to see if that helps at all..)

Any inputs very much appreciated!!!

[335e92tx]

So it only throws codes after full throttle runs? No codes, misfires or rough running at normal loads?

[Nexus313]

Originally Posted by 335e92tx

So it only throws codes after full throttle runs? No codes, misfires or rough running at normal loads?

Nope! It used to only throw codes on full throttle. Now its worse; It does it under normal driving. ~ Under 2K and it will still shake and misfire on stops, then throw O2 + combustion misfire codes.

[Nexus313]

Also getting weird malfunctions now! Rear turn signal for a few days, now rear left brake light? Seems really odd. They work fine for the first couple tries then once the malfunction shows up the lights dim 50% upon using them

[Nexus313]

Heres a video of how the car acts on idle when it's stopped. (I'm not applying throttle in the video it's all being done by itself)

[335e92tx]

And you have reset all adapts?

Do a accelerator pedal reset. - but dont use the cable.. use the youtube method.

Battery and grounds good?

[Nexus313]

Originally Posted by 335e92tx

And you have reset all adapts?

Do a accelerator pedal reset. - but dont use the cable.. use the youtube method.

Battery and grounds good?

Done that already. No difference.

Battery is good except the T Screw that holds negative terminal in the back snapped off when I was disconnecting the battery to pull JB4 out of the ECU.

The car was already having weird turn signal malfunctions before that, however.

[Nexus313]

Update: Car is knocking alot louder now.. I can here it sitting in the cabin on idle too.. Here's a video...

I'm scared that it's the rod bearing knock.. Does anyone have any opinions?? Stressed/Worried at this point. There was absolutely 0 metal shavings in the oil filter or oil last oil change. I don't know about now.

[S3nder]

This not sound good try to jack Car up and hear from oilpan If sound coming from bottom or from Head !

I same problem with misfire but after remap ... only problem was Old spark plugs and after That no misfires again..

[335e92tx]

Originally Posted by Nexus313

The car was already having weird turn signal malfunctions before that, however.

sounds like some ground or something.

Re: Vid -
doesnt sound like a rod. Id get it close to 180degrees, idling. Then clear all codes and restart. See which code comes back first. And just drive it for a while and see what happens. If its a rod there's nothing you can do anyway. Dont hammer on it. See what drivability issues crop up when.

Originally Posted by Nexus313

There was absolutely 0 metal shavings in the oil filter or oil last oil change. I don't know about now.

open oil filter housing and look for signs . Maybe take an oil sample.

[Nexus313]

There was no knocking under the car, so I guess that's a good sign. Also it's not a violent rod knock as other YouTube videos show.. *Slight relief*

I heard the knocking could be loose spark plugs, so I checked and...Turns out some spark plugs were loose, Just re-tightened them.. That's odd because I did them a month ago and torqued to 17 ft lb... Will re-test knocking now & misfire now.

In addition to that, I used Rheingold ISTA software to re-code injectors instead of INPA this time, although the values were already fine when I checked, I re-coded them anyway..

No CEL lights popping up today - Just 2AAF fuel pump plausability.. Will do more testing today and update the thread.

[335e92tx]

g/l

[Nexus313]

Update: Car was fine after I tightened spark plugs, no more knocking, no more codes, car was running smooth.. But it took it for a long drive (100km)

Then I got some codes to popup! Again!..

The codes are: 2C3F - O2 Sensor before cat - LINE Fault, 2CAA - O2 Sensor before cat - TEMP.

So it's pretty clear, with the random turn signal malfunctions, random brake light malfunctions, random misfires(The fact that they are always Cylinder 1-3 only), O2 codes constantly showing that I need a new MSD81 DME.

So now here's my to do list:
- Check continuity from O2 sensor plug to DME.
- Get an MSD81 DME off eBay if continuity is good.
- Replace MSD81 DME + Battery
- Replace Bank 1 O2 sensor with OEM bosch O2 sensor (I might just do all 4 to be safe)
- Replace HPFP/LPFP/Fuel pressure regular + HPFP/LPFP Sensor
- Re-Code injectors with the new DME.

What do you guys think? here is the thread which I got the information from: http://www.e90post.com/forums/showthread.php?t=1347736

I'm suspecting that the aftermarket Chinese O2 sensor + Dated JB4 chip is the cause of all these problems.

[e92.danny]

Did you ever find out what was the issue?