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General E46 Forum
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Old 10-26-2012, 05:42 PM   #1
Mr330iM
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Help ! Misfiring issue ! 330i BMW

I have a 2002 BMW 330i, I noticed a problem when I received my car back from my father. He told me he filled my tank with 91 octane gas before giving my car back, I usually put 92 or 93 in. After I got my car back I noticed that the car was idling funny , rough when accelerating and stopping, misfiring, and check engine light came on.I immediately took the car to autozone to get the light checked out. The guy told me there was 14 error codes. They consisted of all 6 cylinders misfiring, large vacuum leak, mass air flow sensor faulty, fuel injector fault, faulty ho2 sensor) he told me that these were probable problems from the codes he received. He told me that I should perform a tune up and that would eliminate a lot of problems , And my father a BMW owner as well said it has too be a sensor if all 6 cylinders are malfunctioning. Before I pay any money to get it fixed, can anyone tell me what could it be out of that list ? And how did this problem occur? Was it because my car is use to 92- 93 octane and he put 91? Or is it just a wear and tear problem. Can anyone shine light on my problem I would greatly appreciate it . Symptoms were: rough idling, jerky when accelerating or stopping , weird turn off, and sometimes when its running it looses power accelerating. The car acts normal sometimes though.
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Old 10-26-2012, 05:49 PM   #2
joegr
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Wear-n-tear. I bet you have a big intake air leak.
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Old 10-26-2012, 05:54 PM   #3
Mr330iM
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Explain a big intake air leak .... Please I'm new too this stuff
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Old 10-26-2012, 05:55 PM   #4
scarede46er
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Perhaps you can get a BMW scanner. It will tell you exactly what part/s are bad. 30 bucks on ebay.
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Old 10-26-2012, 05:55 PM   #5
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My son, my son. Listen up!

See my signature? Below the photo of my car there's three links. Click on the link titled "JFOJ." Do it.

Hit the back button on your browser, see signature again--do it all!

GL!
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Old 10-26-2012, 05:56 PM   #6
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Originally Posted by scarede46er View Post
Perhaps you can get a BMW scanner. It will tell you exactly what part/s are bad. 30 bucks on ebay.
If its a vacuum leak, it won't.
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Old 10-26-2012, 05:56 PM   #7
scarede46er
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Explain a big intake air leak .... Please I'm new too this stuff
Not necessarily. It MAY be a bad sensor and your dad may be right. Don't throw parts in. But ya, examining for leaks is a great idea.
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Old 10-26-2012, 06:01 PM   #8
Mr330iM
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So what is recommended that I do from the point I'm at now ?
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Old 10-26-2012, 06:02 PM   #9
scarede46er
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Scan. Then JFOJ.
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Old 10-26-2012, 06:02 PM   #10
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So what is recommended that I do from the point I'm at now ?
I already told you what to do.
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Old 10-26-2012, 06:04 PM   #11
Mr330iM
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So click your link then read all of that ?
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Old 10-26-2012, 06:04 PM   #12
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My son, my son. Listen up!

See my signature? Below the photo of my car there's three links. Click on the link titled "JFOJ." Do it.

Hit the back button on your browser, see signature again--do it all!

GL!
This isn't that hard to follow
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Old 10-26-2012, 06:23 PM   #13
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best thing to do is ... wate for it....


research! Yes... like Mango specified. In order to understand the possible problem in the system, You need to understand the system first my little grasshappa!

Look for a vacuum leak, that will solve 80% of your issues.

Sent from my SGH-I727R using Bimmer App
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Old 11-18-2012, 09:09 AM   #14
Jnj1015
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E46mamgo I am interested in reading your links burial unable to locate them ???
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Old 11-18-2012, 09:40 AM   #15
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Originally Posted by Mr330iM View Post
So click your link then read all of that ?
I love how he asked for help a then asked us to explain further then when we give him references he doesn't want to read it cuz he is too lazy

Last edited by flashmeow; 11-18-2012 at 09:41 AM.
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Old 11-18-2012, 09:43 AM   #16
flashmeow
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Op.. I think u should ask your dad what did he do to your car. Codes like that doesn't pop out of nowhere
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Old 11-18-2012, 10:21 AM   #17
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You need to read all the links in below in my signature.

Note to the wise: 02 sensor and MAF replacement should be the LAST thing considered and performed. You will likely have plenty of other problems to address before you get sensor replacement!

If you are using anything other than a computer, you will not see the links in a signature, smart phone apps do not display signatures.

You can have all the tools in the world, but our eyes and your brain are the best diagnostic tools available.

The good news is most of the obvious problems are well documented and can easily be visually inspected.

Good luck!
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