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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 08-04-2012, 11:06 PM   #21
jfoj
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Visual inspection will find most of what a smoke test can indicate assuming you know what to look for.

Again, suggest anyone with lean codes and misfires to read the first link below in my signature.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-06-2012, 09:12 AM   #22
Hbenmeir
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On bimmers lean with low fuel can that cause a misfire. Do I have to worry about this being ignition related or just vacuum and fuel system
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Old 08-06-2012, 09:51 AM   #23
jfoj
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The low fuel is usually detected by the O2 sensors. So a lean mixture does not have enough fuel, therefore on the extreme end of lean you will also see misfire with low fuel based upon what the O2 sensor is reading.

Lean conditions cause misfires, sometimes not even really detectable when driving the car.

Ignition can contribute, however, most ignition related problem are far more obvious and usually happen under load, more likely at lower RPM in 3rd-6th year or with the torque converter clutch locked up.

You need to see if your car is also triggering P0171 & P0174 along with the misfire codes and check everything outlined in the first link in my signature.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-06-2012, 09:55 AM   #24
Hbenmeir
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Ok well I found my problem cause if my car has a miss I'll kiss your ass so o2 sensor thank you
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Old 08-07-2012, 09:00 AM   #25
Hbenmeir
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How many o2 sensors are on these cars? Are they only in the exhaust
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Old 08-07-2012, 09:35 AM   #26
jfoj
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4 total, 2 pre Cat & 2 post Cat, but not sure why you are interested in changing the O2 sensors as they are not likely your problem.
__________________
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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 08-25-2012, 07:28 PM   #27
0mega9
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While an O2 sensor may be the cause, so could a number of possible gas/air leaks throughout system b4 it gets to engine...
For me it was the gas-cap...
The seal inside it was too old...
Once I replaced the cap..., no more light....
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