|
This is scary, but I would coast on a down hill straight away and turn off my engine then quickly put in "on" position so the steering wheel will not lock up to listen for errand noises.
Then pull over to a gentle stop, To turn her back on then go. |
There are swirl marks in the undercoating when I take off the rear tires. I think the noisy side is worse than the drivers side. The markings are very slight in any case. I've long suspected they were rubbing on the inside.
Is there some kind of white power, chalk or something I can put on the inner face of the tire to confirm rubbing? The wheels/ rims on my car are not stock, came off a 944, Phone Dials (bought the car this way). |
Spray some white primer on the inner edge then take her for an aggressive curvy drive. Come back home and remove to see, if rubbed off, you found the issue.
Johnson Alignment sprays white paint to do their alignment, I wished they didn't but it works. Well, an excuse to detail my baby :D |
Quote:
When you said "inner edge", you meant inner edge of tire, right? |
Yes, the point where it goes up the tire wall.
I would paint off ( mine is black under coat so I sprayed that on my rub outs) the rubbed out part in the wheel well to insure it was not a very old symptom. |
Spray "Chalk"
My kids got me what amounts to spray on chalk, washes off with water. Originally it was for putting a number on the car but now I use it to mark the tires during AutoX, DE so I can see how my pressures are working.
I think they found it at Wal-Mart or a Dollar Store. |
Quote:
|
Quote:
|
Quote:
|
mark, i have the exact same sound. drives me insane especially since every time i have a mechanic in the car it refuses to make the sound... in turn, making me seem even MORE INSANE!
mine is slightly more high pitched but same behavior. suddenly comes on at speed, pitch lowers as speed lowers, then suddenly cuts off at about 15-25mph. not affected by engine speed or gear/clutch. i've had this noise for about 15 years (10+ in storage), multiple mechanics have never solved it. at one point i thought i fixed it by adjusting the tension on the hand brake cable, but came back. anyways the guy who just rebuilt my engine and trans who is an absolute porsche genius says it sounds like bad wheel bearings. haven't quite decided if i want to attempt this myself but i'll do some more research on the forum about replacing bearings. in any case, it's on the top of my list. |
Paulo,
What you are describing is pretty much my exact situation. In gear, out of gear, clutch in, clutch out, engine off, engine on... and after driving about 25-30 miles it seems to start...but not all the time. Just some times. But the funny thing is, my BMW makes a similar sound and on that car I KNOW it is the tires, but the difference there is I think the BMW sounds like that all the time. So yours actually was tires, that's really interesting. And it started up after a driving a while? I wonder if the tires just heat up and it starts happening. Very interesting... Mark. Quote:
|
Yes, that's it. Comes on at speed (maybe 30-40 mph or so) and when I slow down to 15-20 it cuts off.
Also - just to close the loop on another response, my car is the same as yours in that the pitch changes with the speed of the car, and not with the RPM's of the engine. The pitch decreases in frequency as the car slows down. I'm glad to hear you've had this 15 years, in a way, because now I'll just relax and keep driving and try to pinpoint it over time. I had visions of having to rebuild the transmission... ;) Mark. Quote:
|
I've got the same freakin' noise....drives me crazy! Didn't start till the recent CV rebuild.
I've been thinking it was the CV's on the drivers side and plan on pulling the boots and looking at the grease. Just last year, I relpaced the inners and re-packed the outter bearings. Since it doesn't do it for the first ten miles or so, my theory was the grease was getting hot and somehow causing the noise. I actually bought a large syringe last week to inject more grease into the boots. Keep us posted on your outcome. |
Spray Chaulk - possible source
Quote:
Another possible source: Abrivo Sports http://forums.pelicanparts.com/uploa...1309959225.jpg (sorry, I don't know the coding to make this image smaller - I'll edit if I find it) |
how long ago were the CV joints last serviced?
|
on my car, I'm not sure. I've only owned it the past 2,000 miles, but I can look through the records and see if anything's mentioned.
|
here's a video clip i took this morning on my way to work. there's some wind noise but once i start coasting to a stop you can clearly hear the sound bounce off the fence (it abruptly cuts off at about 15mph). i don't have it shown in this video, but it comes on just as suddenly at about 25mph. this used to be a once-in-a-while issue, but it's been non-stop lately... i don't know how much more embarrassment i can take ;)
mark, does this sound the same? Annoying sound from my 1980 911SC on Vimeo |
I still vote wheel bearing. Have you jacked up the offending side and done the 12 o'clock to 6 o'clock tire test to see if the bearing is loose at all?
|
Quote:
Update - mine had been pretty intermittent, but Saturday I installed a Wevo shift coupler and readjusted the shifter (Wevo) and though I don't believe it is related, the sound is always there now but coming from BOTH sides. I mean, it goes away at 15 mph, but it seems less intermittent and more "always". The one other thing that has changed is, the temperatures are up in the upper 90's ever since I did the work on the car - so that may have something to do with it. Well, that and the fact that I jacked the front of the car up that weekend to mess with my chin spoilier. No idea if jacking it up, futzing with the shift coupler, or the high temps have had an effect. Will be interesting to see if it goes back to intermittent again. |
One easy way to determine if you might have a bad wheel bearing is to take the car for a spirited drive, get it well warmed up and then feel each of your wheel hubs (rim on) in turn to see if one or more are significantly hotter than the rest. Does it start up right away? Often a just going bearing will not make noise until it gets hot. So there is my two cents, I have used this trick before to determing a bad wheel bearing, if you want to get fancy you could do the above, then pull the wheels and shoot the hubs with an infrared thermometer for accuracy, but the hand check has always worked for me.
|
| All times are GMT -8. The time now is 03:32 AM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website