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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Rough Idle wih P00bc code



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      06-03-2012, 01:24 AM   #1
Ceasar91706
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Rough Idle wih P00bc code

My car is a BMW e92 328i coupe with 90,000 miles.

A little background. I notice a rough idle on my car and eventually got a misfire DTC for a misfire in the fourth cylinder. I did some research online and saw some DIY video on how to change ignition coils. I was able fix locate the bad ignition coil and install a new one. NOw my car has improved about 70% but I still get a slight rough idle when sitting and waiting for a stop/red light for 30 seconds or more. My RPM goes to 500 and hovers there for a couple of seconds and drops to about 450 and then bounces back to 700 rpm with a little engine jolt/shaking. The only code i get from my scanner is P00BC-Mass or Volume Air Flow "A" Circuit Range/Performance - Air Flow Too Low. Any suggestion I can do before I take it to the dealer/indy shop? I have gone online but this Diagnotic trouble code is not very common.. Thank in advance for any feedback
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      06-04-2012, 01:44 AM   #2
RazRokz.!
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I would have changed all of them, spark plugs and coil packs, then reset your adaptations. They're not too expensive and youre supposed to around that mileage as well I believe...
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      06-05-2012, 01:22 AM   #3
Ceasar91706
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Quote:
Originally Posted by RazRokz.! View Post
I would have changed all of them, spark plugs and coil packs, then reset your adaptations. They're not too expensive and youre supposed to around that mileage as well I believe...
Thanks RazRokz.... Today I changed my Crankcase vent hose because I accidentally broke the hose. I notice a leak on my valve cover gasket near the passenger firewall and took the hose to get a better look but broke the hose. My next step is to change the valve cover gasket-- there are some very good DIY around here and for the n52 Bmw 5 series. I'll be right back to comment on my progress or lack of :-)
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      06-05-2012, 11:31 PM   #4
Ceasar91706
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I do.. I bought one from Harbor Freight... It's pretty comprehensive
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      09-09-2012, 06:23 PM   #5
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I am having the same issues with my 07 328xi, code P00BC, Can anyone suggest what to troubleshoot?
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