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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 03-15-2017, 10:06 PM   #41
sweetbeats
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New injector seals installed, fuel rail reinstalled.

Next will be installing the new DISA valve o-ring, and then put the intake plumbing back in place replete with new upper and lower intake boots, and a new dual port vacuum elbow.
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Old 03-16-2017, 04:10 AM   #42
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Okay. Everything is back together.

Before clearing codes this is what the car thought was wrong with it:



After clearing codes and running the engine for a bit this is what the car thinks is wrong:

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Old 03-16-2017, 02:34 PM   #43
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I've configured OBDFusion according to the instructions, and will hopefully have time to run the 3 logs and a diagnostic report tonight and upload to Dropbox.
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Old 03-17-2017, 01:59 AM   #44
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Here we go...logs and a diagnostic report...

Cold idle log (note: I was unable to capture a log from a complete cold start without actuating the throttle; the engine would not stay running. I started the engine from a completely cold state, and pressed lightly on the throttle enough to keep the engine running until it would maintain idle on its own...probably 15 seconds or so. I then shut the engine off for a few minutes, and then restarted the engine and captured this log...I can't remember if I had to blip the throttle to get it to start again...but I know I didn't have to hold the throttle, if I actuated it at all for this cold idle log):

https://www.dropbox.com/s/9k56to15q3...22642.csv?dl=0

Warm highway cruise log:

https://www.dropbox.com/s/f984blp1dm...25843.csv?dl=0

Post warm highway cruise diagnostic report:

https://www.dropbox.com/s/1noek2r4ol...3-16.html?dl=0

Warm idle log:

https://www.dropbox.com/s/povl4lr33q...31554.csv?dl=0

Hopefully I configured the app and captured and uploaded the data correctly. I truly did my best to follow the OBDfusion app configuration and data capture instructions. If I did something wrong, mea culpa...
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Old 03-17-2017, 06:50 AM   #45
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There appears to be a problem with the DropBox line for the warm idle Log. Received a message from DropBox that there was a problem.

But moving on, there seems to be a fairly big issue that you have missed so far. The fuel management system is in error almost the entire time, this means the DME cannot properly manage the fuel control.

So one thing that stands out initially is there is a problem with the Bank #2 Pre-cat sensor Voltage. Possibly the wiring is shorted??

Can you run a Log with the Bank #2 Pre-cat O2 sensor disconnected, this will allow me to determine if the problem is with the sensor or sensor pigtail or something with the engine bay harness or DME.

The other thing that you should do is label all the O2 sensor pigtails. Trace the sensor wiring and label the wiring at the connector with B1-S1, B2-S1, B1-S2, B2-S2 then we will verify the O2 sensor wiring is correct once you have the sensor pigtails labeled.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-17-2017, 09:25 AM   #46
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Thanks for the reply.

I need help knowing which pigtail is the bank 2 pre cat O2 sensor. I have two 4-pin pigtails in wire management clips on top of the fuel rail. Those are the O2 sensor pigtails...yes?

And do you want a cold or warm idle log after I disconnect that O2 sensor?

Thanks again.
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Old 03-17-2017, 09:39 AM   #47
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That's why you need to trace and label the sensor connectors. Once the sensors are labeled then we will figure out if they are properly connected.

In the short term, you can just unplug BOTH Pre-cat O2 sensors if you have no idea what is going on with the O2 sensor wiring.

As for the Log, does not matter, cold or warm is fine, I need to see what happens to the Voltage once the O2 sensor is disconnected.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-17-2017, 10:26 AM   #48
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Got it.

So the log can be fairly short, yes? Maybe a minute?

And am I correct the ore cat O2 sensor pigtail connectors are the two in the wire management clips over the fuel rail?
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Old 03-17-2017, 10:53 AM   #49
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Log with NEITHER pre cat O2 sensor connected:

https://www.dropbox.com/s/q6um1xbo2t...83557.csv?dl=0

Log with ONLY REAR pre cat O2 sensor connector (on top of fuel rail) connected:

https://www.dropbox.com/s/7r8ppyjohb...83755.csv?dl=0

Log with ONLY FRONT pre cat O2 sensor connector (on top of fuel rail) connected:

https://www.dropbox.com/s/s74vk3hq5j...84024.csv?dl=0

Last edited by sweetbeats; 03-17-2017 at 11:06 AM.
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Old 03-17-2017, 11:20 AM   #50
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Oh shoot...now I'm seeing two more similar connectors over the exhaust manifolds. Are *those* the pre cat O2 sensor pigtail connectors, and the ones on top of the fuel are for the downstream O2 sensors?

I'm trying to find something definitive that tells me what connectors go to what...I'll pull stuff out of the wire management clips later and trace where they go...have to run to work now.
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Old 03-17-2017, 11:48 AM   #51
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Do not get overly excited at this point.

Just trace the 2 Pre-cat sensor wires, they are short and should be relatively easy to follow.

If you cannot figure out which Pre-cat sensor is which, unplug both of the Pre-cat sensors and run a Log so I can see if the problem with Bank #2 is the wiring to the sensor or a engine bay wiring harness or DME problem.

How old are the Pre-cat O2 sensors, you may have stated this, but it is easier for me to ask again. Have you replaced them?
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-17-2017, 12:16 PM   #52
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Okay.

I will follow up later tonight regarding locating the pre cat sensor connectors, disconnect both, and run a log.

I don't know the age of the sensors. We purchased the car about a year and a half ago. It had 192,000 on it at the time and is pushing 214,000 now. I'll double-check the records we got with the car, as some work was done not long before we purchased the car, but from memory it was brakes. Since we've owned it I've replaced the CCV system, cooling fan clutch, engine oil dipstick tube seal, engine oil dipstick o-rings, engine drive belts, idlers and tensioners, throttle body seal, and now the fuel injector seals, DISA o-ring, and upper and lower intake boots and the small vacuum elbow.

Last edited by sweetbeats; 03-17-2017 at 12:17 PM.
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Old 03-18-2017, 12:18 PM   #53
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Here is a log with BOTH pre cat O2 sensors disconnected:

https://www.dropbox.com/s/debph29ojb...01418.csv?dl=0

Last edited by sweetbeats; 03-18-2017 at 12:19 PM.
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Old 03-18-2017, 12:37 PM   #54
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The problem is with the Bank #2 Pre-cat sensor. Either the wiring is damaged or pinched somewhere or the O2 sensor needs to be replaced.

If you think the Pre-cat O2 sensors are original, suggest you replace both and make sure they are connected to the proper engine bay connectors.

Once you label all O2 sensor pigtails, you then set up a Dashboard on the OBDFusion App with gauges for all 4 O2 sensors, then unplug a single O2 sensor and see if what gauge flatlines to 0.45 Volts, this gauge should match the label on the O2 sensor.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-18-2017, 01:43 PM   #55
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Perfect. Thank you.

Spraying some penetrating oil on the existing sensors now.

Picking up a new set of them this afternoon along with a socket to remove/install.

Will then label the pigtails and setup the dashboard and double check connections.

Will report back. Thanks again.
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Old 03-18-2017, 02:01 PM   #56
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Wow. That was super easy. Turned out I had the right socket already. Only took about 5 minutes to get the old ones out.
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Old 03-18-2017, 06:17 PM   #57
jfoj
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Run another warm idle Log so we can see that the Bank 2 problem is cleared out and if the fuel management system is operating correctly.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-20-2017, 08:18 PM   #58
sweetbeats
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Warm idle log with 2 new pre cat O2 sensors installed:

https://www.dropbox.com/s/9g5llbnyb3...81306.csv?dl=0

I'm trying to create dashboard for the 4 O2 sensors but can't get the virtual gauges to register anything. Maybe I have the wrong PID selected? I was using the same ones from the preferred PID list in the PDF setup instructions for OBDfusion...the "O2 sensor voltage wide range (Bank X, Sensor X)" PIDs. Is that incorrect?
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Old 03-21-2017, 04:44 AM   #59
jfoj
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Somehow we went from pretty good to bad while changing the Pre-cat O2 sensors.

The reason you think the Dashboard with the O2 sensor Gauges is not working is because all the O2 sensors are flat lined at 0.02 Volts when at a minimum the bias Voltage from the DME should be 0.45 Volts and then they should show activity once they are warmed up.

So I would unplug 1 of the O2 sensor connectors and see if the Voltage returns to 0.45V, if it does, the O2 sensors may be connected wrong, if the Voltage does not change, then check and replace any blown fuses. Make sure you check the fuse carrier with the 5 fuses inside the DME box as well.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 03-21-2017 at 04:45 AM.
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Old 03-21-2017, 09:34 PM   #60
sweetbeats
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Short cold idle log with one of the pre cat O2 sensors disconnected:

https://www.dropbox.com/s/aso7v7imvv...92644.csv?dl=0

Looks like I likely connected the new sensors backwards, yes?

"Label the pigtails" he says...you must get awfully frustrated when folks don't follow your simple advice. Thanks for your patience. I'm going to swap the connections and run another short log to see if the voltages remain healthy for the O2 sensors, and then wait for further instruction.
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