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Porsche noise on Turbo 2007 - what is it?

My 2007 Porsche Turbo is making a loud humming whistling noise when cold. The sound is coming from the the front side of the engine, it seems. At lower speeds it is pronounced. The dealer says I need to replace the clutch slave and master cylinders ($2,225). I don't notice any issue with the clutch and I also don't notice any leaks on my driveway. At first they guessed it was a clogged line coming into the gas cap area. I am having a hard time believing it is both of these parts that they are now saying. Anu suggestions?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

j_del
  • 1586 Answers

SOURCE: Alero loud humming/roaring sound coming from front end.

That's indicative of a wheel bearing, which is why you were told to change that out. However, it's also possible that the carrier bearings in the differential (where the drive axles attach) have gone bad. That happened to me on my 300ZX several years ago, and I had to replace the diff bearings. I would have them checked out somewhere other than a dealer (you'll probably get a better price from an independent shop).

As a sidenote, to be sure it wasn't a wheel bearing, if you hear it quiet down in a turn one way but get louder in a turn the opposite way, it's likely the wheel bearing. If you turn left at speed and it gets louder, then it's the right bearing (since you're loading up that side of the car). If it gets quieter in a right turn, it's the right side (you're unloading that side of the car and not putting as much weight on it, so it doesn't drag as badly). See if you get that symptom just to be sure that the wrong side front wheel bearing wasn't changed.

Posted on Sep 01, 2008

autodr
  • 260 Answers

SOURCE: Bleeding clutch slave cylinder

i think youre doing the right thing. they are very stubborn to bleed because the hyd. line goes up high across back of engine before droppiing back down to slave cyl., trapping air. could try to gravity bleed by opening bleeder at slave, cap off of master cyl, full with fluid then it may start to come out after a bit. then try your process again. or can try to bleed at connections further up the line, working your way back to bleeder. hope this helps. be patient.

Posted on Nov 15, 2008

landsend
  • 1066 Answers

SOURCE: 2001 Honda Accord Clutch Issue

check the actual pedal and clutch linkage.  Also look for a fitting thats emitting air into the system.

Posted on Mar 24, 2009

mechanicm639
  • 253 Answers

SOURCE: loud humming noise from front end of Durango 4 x 4

You have a hub/wheel bearing going out. You need to jack up the vehicle on each side. Grab the top and bottom of the wheel and try to move it in/out at the top and bottom. If this does not work then roll the wheel as fast as you can and see if you can hear which one it is. Good Luck.

Posted on May 13, 2009

  • 583 Answers

SOURCE: 02 Cruiser. Replaced clutch master cylinder cause

is the clutch power assisted(vacuum)?if so couldvery well have some bearing on what is happening.I WILL TELL YOU A STOREY.A couple of months ago I changed the clutch master cyl. on my land cruiser and because I do all my own work still I didnot obey the golden rule..3days later i changed the slave cyl...l again did not obay the golden rule...... 2 days later iagain pulled the master cyl off cleaned it all out, but this time I OBEYED THE GOLDEN RULE,WHICH IS::always change the brake fluid when ever you change amaster cylinder either brake or clutch or when I was doing work for other people,if the brakes were worked on or the clutch you drained the sytem and relaced the fluid...ANY COMMERCIAL WORKSHOP THAT DOES NOT DO THIS IS GOING TO HAVE COMEBACKS ..it may only be 5or10% but for a $5container of fluid it isn` t worth the chance I was in that5 or 10 % are you? that is true,not more than 3 months ago give it some thought ....................

Posted on Aug 20, 2009

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