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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 07-17-2016, 01:33 PM   #1
BAMFKaleb
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Join Date: Mar 2016
Location: Lexington, KY
Posts: 22
My Ride: 2003 330Ci
Fuel Pump/Air flow Troubles

My car hesitates upon take off, which has led me to launch an investigation.
I have read that it could range from my vacuum solenoid to my fuel pump slowly dying. I have found a few videos about the vacuum system, I can't really test the "smog pump" until winter as the man in the video stated it was only used in cold weather leading me to believe it's not an issue when it's 80F outside. So this leaves the vacuum check valve, vacuum solenoid, fuel filter and fuel pump. I'm going to attempt to check my check valve today and attempt to find a solenoid. My real issue is "what if I need to change my fuel pump?" I haven't found a single article or drawing on a napkin on how to change the fuel pump in a 330Ci convertible. in everything else it's right under the rear seat. I look under my seat and it doesn't seem to resemble anything that would look to be a fuel pump.

I'm looking for advice and a thread/guide/video showing how to change the fuel pump in a convertible. Do i have to drop the tank? Also as of late after clearing my codes none have returned but I still have some hesitation and RPM fluctuation during idle sometimes it feels like a miss. (Maybe a coil pack?) I have also switched back to premium gas and I'm going to begin taking notes as to how performance is as the tank empties. I drive 60 miles one way to work five days a week. The car drives fine and little to symptoms upon arriving at work no noticeable hesitation and smooth idle after an hour on the interstate. Codes posted below. Thanks in advance.

P1342 - Misfire during start Cylinder 1
P1344 - Misfire during start Cylinder 2
P1350 - Misfire during start Cylinder 5
P0491 - Secondary Air Injection System Insuffiecient Flow (Bank 1)
P0492 - Secondary Air Injection System Insuffiecient Flow (Bank 2)
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Old 07-17-2016, 05:06 PM   #2
Max'd out
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Join Date: Apr 2012
Location: Charleston WV
Posts: 527
My Ride: 04 330cic
The fuel pump is located under the rear seat bottom. You have to remove the rear seat then follow the DIY the same as you would with any other E46 330. You can fine great step by step information in the DIY section of the forum. Learn to search the forum for loads of info on problems.

Also, post your question in the general section of the forum for a better response because the problems you are experiencing are not specific to convertibles.

Good luck and welcome to the forum.
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Old 07-17-2016, 07:13 PM   #3
BAMFKaleb
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Join Date: Mar 2016
Location: Lexington, KY
Posts: 22
My Ride: 2003 330Ci
Quote:
Originally Posted by Max'd out View Post
The fuel pump is located under the rear seat bottom. You have to remove the rear seat then follow the DIY the same as you would with any other E46 330. You can fine great step by step information in the DIY section of the forum. Learn to search the forum for loads of info on problems.

Also, post your question in the general section of the forum for a better response because the problems you are experiencing are not specific to convertibles.

Good luck and welcome to the forum.
In that case I'll post this in the general forum, I couldn't find the answers I was looking for, especially for the fuel pump location. Thank you for your help.
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Old 07-17-2016, 07:41 PM   #4
Max'd out
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Join Date: Apr 2012
Location: Charleston WV
Posts: 527
My Ride: 04 330cic
When you take out the back seat, there is a leather flap that's located at the armrest opening. This flap has to be removed by sliding it off a metal rod. Been a while since I did mine but this little detail hung me up for bit before I figured out there was a metal rod holding the flap.
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