 » Site Navigation | | | | » Recent Threads | | | 1999 M3 Swap 09-07-2023 10:10 PM 05-02-2024 08:18 PM 6 Replies, 405,387 Views | |  |  |  | |  06-29-2009, 02:48 AM | #1 | | Member Join Date: Aug 2008 Location: PA Posts: 34 |  Is this a noise any of you m44 owners have heard? VIDEO!
My m44 developed this sound that I cannot quite figure out. I drove it around for awhile last night no problem, then I stopped at a convenient store When I got back to my car and fired it up, this noise was present. I hooked it up to a scanner and no codes showed up. After driving it a bit today, it started out fine then developed the noise after 25 minutes of driving. After driving a bit more, it began to quiet down under acceleration, returning if the rpms dwindled. An erratic idle also accompanies this problem, I think they are related but hopefully someone here has heard this sound before. When I shut the car off, the noise winds down on its own after the engine is off, whicih makes me think a vacuum leak somewhere? The sound seems to be coming from around where the roundel logo is imprinted on top of the engine...TIA!  |  |  | | 06-29-2009, 03:02 AM | #2 | | Senior Member Join Date: Aug 2008 Location: Raleigh/Charlotte, NC Posts: 1,233 |
bearing, would have to be there to diagnose.
Alternator, idler pulley...ect. __________________ -Jeff
 | | | | | 06-29-2009, 03:10 AM | #3 | | Senior Member Join Date: Apr 2007 Location: Auburn, WA Posts: 1,814 |
pcv valve for sure, try this, whenever the car is making this noise open the oil cap and see if the sound goes away and if the soud goes away then just replace the pcv valve around $50 __________________  5/96 318TI Sport BIG TURBO | | | | | 06-29-2009, 03:46 AM | #4 | | Senior Member Join Date: May 2007 Location: LA, Bellflower, CA Posts: 3,613 |
it could be a ccv valve. i had a noise out of my m44 once but didnt sound exactly like that. __________________ 
-Theta Chi-
Float like a cadilac, sting like a BIMMER
.... my socket is just too thick and won't fit in the hole! damnit!
Marv's 332ti is in the werks. Stay tuned ya'll  ...
Check list: S52 swap, manual transmission swap, 3.25 LSD with M Coupe diff cover, SuperSprint muffler, M3 style mirrors, AFE intake, ASC delete, M50 Manifold swap, UUC strut bar, ZHP lighted knob, Vaders, M-tech interior, OEM armrest, AC Schintzer front lip, AC Schnitzer rear spoiler, Roof spoiler, 18'' rims, M3 front drilled brakes, LED interior lights, 3 spoke Euro style steering wheel, OEM roof spoiler and bike holder, Thule fairing, Euro tail lights, oil pressure guage, carbon fiber hood painted to original paint (still showing CF weaving), what's next to do...? | | | | | 06-29-2009, 04:22 AM | #5 | | Member Join Date: Aug 2008 Location: PA Posts: 34 |
pcv valve? Is that a pretty difficult piece to get to?
I'm going to try that when I hear the sound again...what would cause the noise exactly? Is it air? | | | | | 06-30-2009, 01:16 AM | #6 | | Member Join Date: Aug 2008 Location: PA Posts: 34 |
Jean, I tried removing the oil cap and the dipstick.....the sound went away almost instantly! Good to know that is my problem. I assume the bad PCV/CCV also contributes to the erratic idle...
is it pretty easy to remove? Looks like there are two screws underneath holding it in place but would it be easier to disassemble the manifold or can I remove the PCV and tubes without taking it all apart?
Thanks! | | | | | 06-30-2009, 01:54 AM | #7 | | Senior Member Join Date: May 2007 Location: LA, Bellflower, CA Posts: 3,613 |
yeah, the ccv valve is pretty simple to do yourself. two allen screws underneath and bam. easy switch. just be careful b/c somettimes the plastic impler may be broken from being worn out and go back in the opening. good luck. __________________
-Theta Chi-
Float like a cadilac, sting like a BIMMER
.... my socket is just too thick and won't fit in the hole! damnit!
Marv's 332ti is in the werks. Stay tuned ya'll ...
Check list: S52 swap, manual transmission swap, 3.25 LSD with M Coupe diff cover, SuperSprint muffler, M3 style mirrors, AFE intake, ASC delete, M50 Manifold swap, UUC strut bar, ZHP lighted knob, Vaders, M-tech interior, OEM armrest, AC Schintzer front lip, AC Schnitzer rear spoiler, Roof spoiler, 18'' rims, M3 front drilled brakes, LED interior lights, 3 spoke Euro style steering wheel, OEM roof spoiler and bike holder, Thule fairing, Euro tail lights, oil pressure guage, carbon fiber hood painted to original paint (still showing CF weaving), what's next to do...? | | | | | 06-30-2009, 02:26 AM | #8 | | Member Join Date: Aug 2008 Location: PA Posts: 34 |
good deal...I felt so much better when I pulled the dipstick and the sound disappeared. I'm happy to diagnose a 50 dollar part, as I was expecting something more internal and more money. Did you remove anything to get to those allen bolts? I tried fitting my hand in there to see what size they are, but could not get a good angle...  | | | | | 06-30-2009, 02:51 AM | #9 | | Senior Member Join Date: Apr 2007 Location: Auburn, WA Posts: 1,814 |
yeah i know this from expirience i spend so much money trying to figured this out i even open up the whole engine to see what was wrong, replace all the belts tensioners alternator water pumps steering pump everything dude and it was just that stupid valve but anyways glad i can save people money and time  __________________ 5/96 318TI Sport BIG TURBO | | | | | 06-30-2009, 02:59 AM | #10 | | Senior Member Join Date: May 2007 Location: LA, Bellflower, CA Posts: 3,613 |
hmmm... what i cant remember i took off the brake booster hose and then got to the allen screws that way. __________________
-Theta Chi-
Float like a cadilac, sting like a BIMMER
.... my socket is just too thick and won't fit in the hole! damnit!
Marv's 332ti is in the werks. Stay tuned ya'll ...
Check list: S52 swap, manual transmission swap, 3.25 LSD with M Coupe diff cover, SuperSprint muffler, M3 style mirrors, AFE intake, ASC delete, M50 Manifold swap, UUC strut bar, ZHP lighted knob, Vaders, M-tech interior, OEM armrest, AC Schintzer front lip, AC Schnitzer rear spoiler, Roof spoiler, 18'' rims, M3 front drilled brakes, LED interior lights, 3 spoke Euro style steering wheel, OEM roof spoiler and bike holder, Thule fairing, Euro tail lights, oil pressure guage, carbon fiber hood painted to original paint (still showing CF weaving), what's next to do...? | | | | | 06-30-2009, 03:24 AM | #11 | | Member Join Date: Aug 2008 Location: PA Posts: 34 |
good stuff jean...u def saved me lots of both!!!!! I look fwd to gettin this done....will it do lots of damage if left untreated for a few days while i wait for the part?
marv, how did you prevent the brake fluid from leaking? | | | | | 06-30-2009, 03:27 AM | #12 | | Senior Member Join Date: Apr 2007 Location: Auburn, WA Posts: 1,814 |
prolly not damage, but try not to.
and no brake fluid is gonna leak from the brake booster is only air inside __________________ 5/96 318TI Sport BIG TURBO | | | | | 06-30-2009, 03:53 AM | #13 | | Member Join Date: Aug 2008 Location: PA Posts: 34 |
u da man! thanks a million! | | | | | 06-30-2009, 05:21 AM | #14 | | Senior Member Join Date: Apr 2007 Location: Auburn, WA Posts: 1,814 |
glad i can help __________________ 5/96 318TI Sport BIG TURBO | | | | | 09-17-2009, 10:42 PM | #15 | | Senior Member Join Date: Dec 2008 Location: Los Angeles Posts: 134 |
Jean, You saved me money and trouble. I am so happy to see your post before shelling out money for replacing everything under the hood when I heard this sound from 318ic also
Thanks a lot. I second what poohlikeshunny said. "you da man!" | | | | | |
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