33 replies to this topic

[_HighVoltage_]

Thanks for that! I will look into it.

[fields 100]

_HighVoltage_, on 13 November 2011 - 05:37 PM, said:

Tell you what - it is starting to affect mine as well. I wonder how easy/difficult it is to replace? I also can't seem to find the part anywhere online.

Well, I finally replaced it. Got it from the dealer. The best way is to give them your VIN #,they will find the correct part for you.I actually had two whines: one is a low tone which changes in frequency with RPM and then gradually goes away after about 2 min,give or take.It is not related to the cold weather, just a cool engine, even during the summer months.I think it never completely goes away, you just do not hear it without stethoscope after the engine warms up. Anyway,it is still there, after repair. Another whine (or moan) which is higher in pitch would come on between 1500 and 2000 RPM for about 20-30 sec on the cool engine, then abruptly stop (until next cold start). This one is gone, hopefully forever.

[_HighVoltage_]

Good to know. So...is there a consensus - is it crucial that I replace it too, and will it do any damage if I drive it like that?

[jablackburn]

Quote

I actually had two whines: one is a low tone which changes in frequency with RPM and then gradually goes away after about 2 min,give or take.It is not related to the cold weather, just a cool engine, even during the summer months.I think it never completely goes away, you just do not hear it without stethoscope after the engine warms up.

Mine does that! I think it's the turbocharger bearings, but not 100% sure, as it only seems to make the noise under load driving around.

Quote

Another whine (or moan) which is higher in pitch would come on between 1500 and 2000 RPM for about 20-30 sec on the cool engine, then abruptly stop (until next cold start). This one is gone, hopefully forever.

Would this one do it just revving the engine in park?

[fields 100]

jablackburn, on 16 November 2011 - 06:48 PM, said:

Mine does that! I think it's the turbocharger bearings, but not 100% sure, as it only seems to make the noise under load driving around.


Would this one do it just revving the engine in park?

Never in park.When start driving (cold engine),and the RPM are getting to around 1700-1800, that is when it comes. If you press hard from the start,you may not hear it at all as you pass this RPM range (1700-1800) rather quickly. Otherwise it will moan for about 10-20 sec. and then dissapear, not quiet down, but abruptly cut off.

[Big Will]

Interesting thread. I've had a whine coming from the engine bay in my wagon for about 8 years and never figured it out. It only occurs on a cold engine for the first minute and gets louder with rpm up to about 3000...then the whine abruptly stops. I assumed it was the air pump for a while until we got rid of the SAS system and the whine remained. Then I assumed it was the serpentine belt tensioner but it sounds like there are other possibilities from this thread.

[lookforjoe]

Big Will, on 16 November 2011 - 10:07 PM, said:

Interesting thread. I've had a whine coming from the engine bay in my wagon for about 8 years and never figured it out. It only occurs on a cold engine for the first minute and gets louder with rpm up to about 3000...then the whine abruptly stops. I assumed it was the air pump for a while until we got rid of the SAS system and the whine remained. Then I assumed it was the serpentine belt tensioner but it sounds like there are other possibilities from this thread.

What's annoying with mine is that it ONLY does it (in colder ambient temps) under load while moving. No way to replicate it while stationary at all. I've checked every conceivable source of potential rattle/vibration. In my case, one of the only things left is the clutch/flywheel, but even there, it seems independent of engine rpm.

I don't feel that it is really of any concern, though. The pitch/level has never changed over the years, and nothing has failed as a result of it. Mainly, it just bugs me because I have not been able to locate it, and my car is very quiet & rattle free otherwise.

[jablackburn]

Joe, I'm guessing you've swapped out your turbo with the mods you've done too? And that wasn't it?

Could it be the oil PUMP itself maybe?

[fields 100]

In my case definitely not a turbo. With a long tube stethoscope attached, the sound was coming from the oil cooler line, close to the radiator.Neg.results when checking the turbo same way. Today, at 26F ambient test drove the car again. The high pitch moan is gone completely, the low whine is still there albeit with much lower intensity and shorter period..

[lookforjoe]

jablackburn, on 17 November 2011 - 06:14 PM, said:

Joe, I'm guessing you've swapped out your turbo with the mods you've done too? And that wasn't it?

Could it be the oil PUMP itself maybe?

No. Turbo's don't make the kind of noise I'm experiencing. When a turbo fails, trust me, you'll be fully aware.

Never ever heard of a whiteblock oil pump failure, (except some of the new cheap Volvo replacements), and again, my whine is more of a vibrational thing, definitely not an internal engine noise at all.

fields 100, on 17 November 2011 - 08:21 PM, said:

In my case definitely not a turbo. With a long tube stethoscope attached, the sound was coming from the oil cooler line, close to the radiator.Neg.results when checking the turbo same way. Today, at 26F ambient test drove the car again. The high pitch moan is gone completely, the low whine is still there albeit with much lower intensity and shorter period..

Good to hear you resolved your main concern!

[scumcity14]

mine does it too. always has. It will whine for about 10 driveways up my street when its below 40 and thats all. O-rings won't help, mine are new. I just live with it, its a sound my car makes..

[bob850]

Just for reference, some folks have done the oil pump seals and it fixed a similar sound. Can't be sure it was the exact same issue as yours, but worth reading this thread:

http://volvospeed.co...-cold-startups/

[_HighVoltage_]

Thanks for linking this thread. It possibly explains my noisy lifters too.

[bob850]

I just posted this on another forum but thought I would share here also. Might be helpful to someone.

My car also developed the above-mentioned howling on cold mornings for first 30 seconds of driving. I had switched to synthetic at around 80K miles and the howl developed at around 105K (I have no idea if that matters, just another data point). After much reading, I assumed it was the oil sump pickup tube seal or the oil thermostat.

Well, three weeks ago, at about 107K miles, I changed the oil (and filter) and the noise was INSTANTLY gone. It has not returned at all. The only difference is that I put in conventional oil instead of synthetic since I was also adding Auto-RX. I don't know if something was lodged somewhere, and just the fact that I drained/filled the oil somehow corrected it, or if the difference in oil type did it. I doubt the Auto-RX made a difference since the problem was instantly corrected and Auto-RX takes thousands of miles to work.

I am pretty baffled, though happily so. We'll see if the noise returns when I eventually switch back to synthetic after the whole Auto-RX process. Of course, then it will be summer so the noise may not come back anyway till winter.