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Old 09-14-2016, 02:19 PM   #1
JuiceboxHero
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Join Date: Aug 2016
Location: Houston TX
Posts: 4
My Ride: 2000 323i
Three System Tests not Ready

My car's been having some problems passing inspection. I've googled the problem, searched the forums, I've driven about 5000 miles with the system in the "not ready" and I don't really know what to do so I'm hoping someone here might be able to help.

Not Ready:
- Evaporative System
- Secondary Air System
- Oxygen Sensor

Stuff I've checked or replaced:
- SAP runs fine (haven't checked the relay)
- SAP valve was stuck closed, replaced it
- SAP hose was cracked, replaced it
- SAP vacuum line was cracked, replaced it
- O2 sensors are outputting seemingly correct voltages
- I think I have a slight intake vacuum leak since my long term fuel trim is around 10% for both banks.
- The car consistently shows no error codes

The problem is that the SAP pump won't even try to run as far as I can tell, nor does the SAP valve open when cold staring the car. A friend of mine has a 2000 323 just like mine and his car runs the SAP on a cold start pretty consistently. I've never seen my SAP turn on or the valve open...

I've tried running my car through the recommended drive cycle many times (at night when the roads are clear) and have had no success, other than my Catalyst test passing (took a while).

Anyone have any ideas?
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Old 09-14-2016, 03:27 PM   #2
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 19,137
My Ride: 330CiC, M5, X5
I would forget about the Drive Cycle for now. A good car will clear all the Readiness Monitors in 2-3 days of normal driving.

First things first, SAP is actually a pretty simple system.

Suggest you look at my comments at the end of this thread - http://forum.e46fanatics.com/showthread.php?t=752088

If you cannot get Monitors to clear in like 200 miles, you need to clear codes and start over, but lets wait on this for now.

My guess is your car has original Pre-cat O2 sensors, the SAP pump may not be working correctly and there are other vacuum leaks present causing high Fuel Trims at idle.

Time to read the links below in my signature and all the SAP links I posted in the end of the thread above.

Your car probably needs a crap load of maintenance and love. Think about how old it is!

If you do not have the OBDFusion App, you NEED IT.
__________________
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; 09-14-2016 at 03:27 PM.
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Old 09-25-2016, 11:31 PM   #3
JuiceboxHero
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Join Date: Aug 2016
Location: Houston TX
Posts: 4
My Ride: 2000 323i
I replaced the CCV system and my vacuum leak is now gone (it was the dip-stick o-ring). After driving it on the highway for about 10 minutes, the LTFT is nearly back to 0 (-2 to -3) , it was previously at -8. My STFT is around 0-2 at idle, and my MAF reads 4.6g/s (also at idle). The car throws no codes but I'll check back here after driving it to and from work tomorrow.

The thread you liked is really detailed and after reading through it, the only thing I could come up with is that the pre-cat O2 sensors may be bad / lazy but it's a bit of a guess. Would this make sense if my car never turns the SAP on, nor does it open the check-valve? I know my SAP works (tested by powering it manually), check valve is good (new), vacuum lines are good (new), and the check valve to SAP hose is also good (new). It's like the car just ignores the entire subsystem.
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Old Yesterday, 10:43 AM   #4
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 19,137
My Ride: 330CiC, M5, X5
Assume you have purchased the OBDII interface for OBDFusion at this point.

If you can run a Diagnostic Report, this would help give an idea about what may be going on.

But the car is 16 years old, if the Pre-cat O2 sensors are original, they are LONG overdue for replacement.

Often there are NEVER any codes for lazy/slow O2 sensors, the only codes I ever see for O2 sensors is when the heater circuit fails, this is pretty clear cut for the OBDII system to flag a failed heater circuit.

If you have no problem replacing the Pre-cat O2 sensors, this would be my next suggestion assuming we have no data to be able to get a closer look at what is going on.

The SAP and O2 sensor monitors clearly rely on the Pre-cat O2 sensors so these are suspect at this age IMHO.
__________________
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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