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Old 11-03-2016, 01:35 AM   #1
xfjbmw
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rough idle misfire 99 323i

Hi There,

I am new here, I got a 1999 bmw 323i.

my car is ok as long as it's moving, but whenever it stops in front of stop sign, will go rough idle badly, my al619 scan tool show fuel system status CL OL-drive ... CL if it stops not for long, if it stops for a relative long period of time, the fuel system status will go from CL to OL-fault, and stay there even I start driving again, and fuel trim and O2 sensor all stop function,TP also go zero even I pressed pedal, MAF still got data, next time I restart my car, everything go normal again as long as I can avoid idling. I will appreciate it if anybody out there can give me a hint what's wrong with my car.

BTW, the DTC codes are P0300 P0303 P0304
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Old 11-03-2016, 04:04 PM   #2
xfjbmw
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Let me more specific, I noticed my car had rough idle with engine light on problem some time ago, a scan tool gave OBD II codes P0300 P0303 P0304, I swapped Coils and Spark plugs around, misfires always at cyliner #3 & 4, next things I did including seafoam, throttle body & idle control valve clean, the problem still there, then I noticed the problem described in my last post, if I can avoid idling during routine drive, misfires with the above OBD II codes will not appear. I am new to diagnostic car problem, but looks to me there are some kind of electrical failure after misfires, what you guys think?
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Old 11-05-2016, 07:09 AM   #3
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Moved your thread ot the general section for more help
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Old 11-05-2016, 07:45 AM   #4
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While the AL619 has its place, it will not help so much for Internet Diagnostics and Repair. Trust me, I am the Internet Diagnostic and Repair guru for Driveability issues. Search my user name, you will find plenty of success stories, but I am only as good as the data that I am provided.

Spend under $30 and get the OBDFusion App and proper VeePeak interface from Amazon. Android requires a Bluetooth, iProducts requires Wifi.

I would start with inspecting the DISA and/or the Intake Air Temperature sensor O-ring for leaks.

Smoke Testing is very helpful:

Notes:




Cheap fluid transfer pump from your local auto parts store or Amazon.

http://www.amazon.com/ABN-Multi-Use-...fer+pump&psc=1

A few rubber gloves, rubber bands and some cheap mini cigars from our local gas station or convenience store.

Then read this thread in detail - http://forum.e46fanatics.com/showthread.php?t=897616
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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 11-05-2016, 05:18 PM   #5
xfjbmw
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Thanks for valuable inputs! I'v created a new thread on the general forum. When I cleaned the idle control valve, I check the DISA valve, the vacume can still hold the valve flab which means the DISA valve probably ok according to most internet posts, the O ring looks ok also, the idle control valve also made noise as I shake it as most youtube vedio describe it. I did not do any electrical test on bothe ICV and DISA, just wondering if thats necceary? I wil defintely to see if I can do smoke test to see if any vacume leaks.
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Old 11-05-2016, 05:26 PM   #6
xfjbmw
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Also the IAT seems normal, it range from 20c to 60c(maybe too hot), the ECT usually around 93c when the engine warms up.
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Old 05-19-2017, 05:38 PM   #7
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Hi, all,

After a long break, I came back working on the idle issue(please read my previous posts above) on my car. one day, I found that the idle rough issue gone after the vanos unit was disconneted, it run well and idle at 800rpm well, so I went to replaced vanos o-rings per internet suggestions, but the idle rough issue still there with vanos on, then I went to play around with my INPA software on idle speed lifting, it idle well at 1100rpm, 1000rpm, 900rpm, but when I adjust the idle speed to 800rpm, 850rpm, it couldn't hold the idle speed and quickly drop to 7xx rpm, and started idle rough, and misfired on cylinder #3, then #4 as usual.

Your valuable inputs will be hihly appreiatted!

BTW, fuel trims of two banks on my car are different, LTFT on bank 1 around 8%, 1% on bank 2, STFT around -5 - 5% on bank1, -8 - 1% on bank2, that could be a problem, may not be serious.
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Old 05-19-2017, 08:46 PM   #8
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Since #3 & #4 are problems, I would check the DISA and also the Intake Air Temperature sensor O-ring as well.

Smoke Test would also be a good idea. See the Smoke Test section in this thread - http://forum.e46fanatics.com/showthread.php?t=897616
__________________
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 05-20-2017, 01:57 AM   #9
xfjbmw
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Thanks jfoj! I did spray throttle body cleaner around vacuum lines with engine running, including DISA area, found no vacuum leak this way, maybe should done a smoke test.
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Old 05-25-2017, 08:30 AM   #10
xfjbmw
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what is the click noise?

I replaced the o-ring for the IAT sensor, the idle issue still there. going to do a smoke test.

BTW, found some click noise besides the fuel pump noise with key on, can anybody tell what that click noise is?

sorry, the forum dosen't allow me to attach a .mp4 file.

Last edited by xfjbmw; Today at 01:02 AM. Reason: attach a video
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Old Today, 01:04 AM   #11
xfjbmw
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here is the link for the .mp4 file:

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Old Today, 01:17 AM   #12
xfjbmw
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I also managed to do a smoke test on my bmw today, I created some vacuum leak, and smoke were observed come out the spot, when the created vacuum leak was fixed, no smoke were observed from any place, the rubber glove which I used to seal the intake boot was blowed up like a balloon, so I guess I did the smoke test right and found no vacuum leak on my bmw.

Last edited by xfjbmw; Today at 01:20 AM.
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