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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 01-20-2016, 09:49 PM   #1
kburger
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My Ride: 323ci coupe 2000 bmw
M52tu fuel injector filter cleaning removal

Hi, anyone know how to remove and clean and or replace the filters inside the fuel injectors on M52 engine? I saw a video it looks like my injector. the guy used a nail in a vise to remove the filter. I cant find any other information on this procedure I don't want to ruin my injectors. do I replace the filters inside? part number? thanks in advance.

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Old 01-21-2016, 09:10 AM   #2
markusmarkus
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Why do you want to do this? Is your car experiencing issues? Have you read the codes? BMW E46 fuel injectors are very hardy. I have owned an E46 since August 11, 2000 when I picked up my 2001 330Ci from the dealer. Btw, I started driving BMWs in 1974 when I bought a used 1971 2002 from a used car dealer. I have been reading three BMW forums since then, and I have never seen an issue that turned out to be a bad injector. Clogged yes, bad no.

If you're having issues you need to check the fuel pressure at the fuel rail. The fuel rail is accessible by removing the top plastic cover on the engine. It's held in place by two 10mm bolts. The pressure needs to be at least 45psi.
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Old 01-22-2016, 08:43 AM   #3
kburger
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markusmarkus, thank you for the help here. What tool/how do I measure the pressure on the rail exactly? thanks
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Old 01-22-2016, 08:55 AM   #4
markusmarkus
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There's a fuel pressure gauge that you can borrow from the local parts store. You'll have to remove the massive plastic thingee in which the cabin filter is mounted (Torx screws!) in order to remove the rear bolt on the plastic engine cover. The test valve is mounted on the top of the fuel rail towards the front of the car. It looks like a tire valve stem valve. See item #2 in http://www.realoem.com/bmw/enUS/show...diagId=13_0900. That's the cap on the valve.
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Old 01-22-2016, 03:52 PM   #5
kburger
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markusmarkus thanks. I will borrow the guage and test it asap. i'll reply back with my pressure reading just to follow up.
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Old 01-23-2016, 08:44 AM   #6
markusmarkus
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You're welcome.
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Old 05-01-2016, 05:52 PM   #7
kburger
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markusmarkus my fuel pressure was dead on. been on a mission to turn off check engine light (service engine soon) light for 2 years. I'm down to 2 codes. functional check purge valve is main issue. this one been in there I estimate 8 years at least. had to cut wires to purge valve connector turns out ground wire brown wire has 4-5 volts dc on it with purge valve turned off (short). I used ecu connectors to isolate its in ecu connector 4 pins 21-40 devices. fun fun fun
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Old 05-02-2016, 07:34 AM   #8
markusmarkus
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Brown is always ground in a BMW. An unattached brown wire that has voltage indicates wiring issue.
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Old 05-04-2016, 05:52 PM   #9
kburger
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yes markusmarkus correct thanks. I'm workin on it this ones not easy been there 8 years I think. done a lot of work already going to my shop my tech has an e46 on the lot we are gonna test the purge valve connector voltage on and off with his dealer diagnostic terminal. want to compare voltage values to "known good"
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Old 05-04-2016, 05:53 PM   #10
kburger
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if anyone out there is kind enough could you pull the electrical connector off your purge valve and test dc voltage? please tell me what it reads with purge valve on and off in dc volts. thanks. I have 2000 323ci ms42 dme
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