I have a 2004 Saab 9-3 Linear with 68K.
I am hearing a humming/rumbling sound between 40-45 and 50-55mph. If I hit the brakes to slow down it goes away and if I accelerate out of it, it goes away. It sounds and feels like I am in too high of a gear for the speed that I am going (if it was a manual). All I have to do is accelerate past 45 and 55 and it goes away.
What do you think?
wrote
The only time I had a speed sencitive vibration was when I had a wheel out of balance. It could be that you have 2 wheels out of balance to different extents.
Did both vibrations start at the same time?
Was there a sudden onset of vibration?
"Stephen B." Dec 11, 2007 at 11:18 PM
wrote
different
I agree that 50-55mph is a classic speed for wheel balance vibrations, but noise? Is it constant at those speeds regardless of the road surface or the load in the car? If not, I'm thinking possibly tyre noise. Has *anything* differnnet happened or been done to the car just prior to this starting? Cheers
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The tires are cupped and their is definite tire noise, but this is a different issue. I did a little more testing yesterday and found that when I switch the automatic transmission into the sudo-manual mode I get the same humming/rumbling noise when the rpms are around 1500 in fourth and fifth gear. My guess is that the transmission in automatic is shifting too early. Possible reprogramming of transmission software?
snipped-for-privacy@gmail.com Dec 12, 2007 at 05:22 AM
Whoa! Is it that long since I last logged in...? Sounds like a sympathetic vibration of some sort. (My typing is crap tonight but the Shiraz Malbec that caused it is quite pleasant...) Check oil and auto trans levels are ok before doing anything else (cheap option) and then start hunting. If tyres *are* a prob, then swapping them iwll at least eliminate any secondary issues they are causing. Cheers
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