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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 07-17-2017, 03:30 AM   #21
nebula
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Join Date: Jul 2017
Location: Oakland, CA
Posts: 25
My Ride: E320 bluetec
I setup ODB Fusion to monitor the following:
SAE PID's:

Fuel system 1 status
Fuel system 2 status
Calculated load value
Engine coolant temperature
Short term fuel % trim - Bank 1
Long term fuel % trim - Bank 1
Short term fuel % trim - Bank 2
Long term fuel % trim - Bank 2
Engine RPM
Vehicle speed
Ignition timing advance for #1 cylinder
Intake air temperature
Mass air flow rate
O2 Voltage (Bank 1, Sensor 1) - not all cars have this
O2 Voltage (Bank 1, Sensor 2) - not all cars have this
O2 Voltage (Bank 2, Sensor 1)
O2 Voltage (Bank 2, Sensor 2)
O2 sensor Voltage wide range (Bank 1, Sensor 1) - not all cars have this
O2 sensor Voltage wide range (Bank 2, Sensor 1) - not all cars have this
Input Voltage read by the scan tool

I also played around with the monitor tests and O2 Sensor stuff this afternoon while I was out and the screenshots of those are here:
https://www.amazon.com/photos/share/...cELU54WdePnmTG

So tomorrow morning I just need to fire up OBDFusion hit connect while the key is in the ignition and then go to logs and hit play right before firing up the engine?
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Old 07-17-2017, 07:09 AM   #22
jfoj
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Sounds like your on the right track.
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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 07-17-2017, 11:31 AM   #23
jdstrickland
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A quick lesson on Banks and Sensors

Bank 1 is the bank that contains the #1 cylinder and half of the engine. It's possible that a 4-cylinder engine can have two banks, but most do not. Look at the Exhaust manifold to see if it is split, this will tell you if there are two banks on an inline engine. Bank 1 is the manifold that has the #1 cylinder and the forward half of the engine, Bank 2 has the rear half of the engine. V-type engines have two banks, the same rule for the #1 cylinder applies. BMW 4-cylinder engines are not offered on the E46 in the USA.

As you follow the manifold away from the engine, you will come upon sensors. In an OBD II car, there are generally two sensors on each bank, there can be 3 sensors. BMW only has 2 sensors. The first sensor is responsible for monitoring the exhaust stream and measuring the content for air and fuel. This check is fed back to the computer to fine tune (trim) the ratio of fuel. This sensor is the one that tells you if the exhaust is rich or lean (too much gas or too much air). This sensor is always in front of the CAT, and is designated as Sensor 1. Continue to follow the exhaust pipe past the CAT, you will find another sensor. The purpose of this sensor is to compare the exhaust contents after the CAT with the contents before the CAT, and determine that the CAT has done its job. This is Sensor 2. The exhaust stream goes into the CAT and contains remnants of combustion, these remnants are converted to oxygen, water, and carbon dioxide. If the CAT is not working well, then there will still be combustion gasses and an error code will be generated that tells you that the CAT is below efficiency.

You have, in your BMW, Bank1 and Bank2, and Sensor1 and Sensor2, for a total of 4 sensors. B1S1, B1S2, B2S1 & B2S2. Some cars can have two CATs on each bank, such cars will have a 3rd sensor to measure the efficiency of the 2nd CAT. These cars have a B1S3 and B2S3. Your E46 does not have this configuration of CATs.
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Old 07-17-2017, 02:31 PM   #24
nebula
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It's a new day and here are some new logs:
https://docs.google.com/spreadsheets...it?usp=sharing

Thank you again for all your help.

p.s. This was with the mityvac connected to the Kombi valve on cold start per the discussion yesterday.

Last edited by nebula; 07-17-2017 at 02:36 PM.
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Old 07-17-2017, 02:54 PM   #25
jfoj
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So from the Log you just posted, with the MityVac connected to the Kombi valve, everything looks pretty good.

Not sure of the O2 sensor age, but they are for the most part looking responsive when cold.

This pretty much confirms the SAP pump, output hose and Kombi valve are working.

So if the system is not working, it is a problem with the vacuum control to the Kombi valve. This includes a few vacuum hoses, a vacuum check valve that can be installed backwards and a vacuum control solenoid that is electrically controlled.

All of these parts are under the rear of the intake and a PITA to access. You will need a good mirror, a good LED flashlight and a very good vocabulary to sort these items without removing the intake. It can be done, but not fun or easy.

http://forum.e46fanatics.com/showthr...ghlight=intake

http://forum.e46fanatics.com/showpos...9&postcount=36
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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 07-18-2017, 01:53 AM   #26
nebula
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I went out this evening and did a 4 minute test w/o the Mityvac. Car hadn't been driving for ~8 hours so it was a "cold" start.
Logs here:
https://docs.google.com/spreadsheets...it?usp=sharing

I'm ordering vacuum hoses tonight.
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Old 07-18-2017, 05:44 AM   #27
jfoj
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Before you tear into the vacuum hoses, get 1 more cold start Log when the car has sat overnight.

The last Log looked promising, however, the engine was still slightly warm so the SAP shut off quickly.

All the messing around may have helped things, but I am not 100% sure because at times even if the vacuum portion of the SAP system does not work, often the pressure of the SAP pump can force some air past the Kombi valve.

I assume you have P0491/P0492 codes and/or the SAP Readiness Monitor is not set. Do you also need to get the car to pass Emission Inspection soon 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
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Old 07-19-2017, 01:19 AM   #28
nebula
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Location: Oakland, CA
Posts: 25
My Ride: E320 bluetec
Hello.
Sorry for the delay. Here is today's cold start log -
https://docs.google.com/spreadsheets...it?usp=sharing

Yes I currently have P0491/P0492 codes. Not entirely sure about the SAP Readiness Monitor. Is that the same as the secondary air system monitor test in OBDFusion?
Screenshots of the monitor tests and O2 Sensor stuff from Sunday are here:
https://www.amazon.com/photos/share/...cELU54WdePnmTG

I just bought the car and yes I need to have it smogged
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Old 07-19-2017, 06:10 AM   #29
jfoj
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My Ride: 330CiC, M5, X5, E93
Latest Log looks like the vacuum control is having problems, most likely a leaking hose. The most common problem is with the hose between the Kombi valve that connects to the vacuum control solenoid that is mounted under the rear of the intake, but there are also a few other short hoses back in this location that can be a problem as well.

Good luck.
__________________
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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