Hear Spinning sound at the rear (interior) when drive slow
11-20-2006, 06:16 PM
#1
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Hear Spinning sound at the rear (interior) when drive slow
one of the member here have this problem, it only happen ocassionally. hear spinning sound from the rear inside the car. even sometimes when the car stop or drive slow. what would the problem be?
11-21-2006, 06:19 AM
#9
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definitely not a shudder, we were only manage to hear that sound after driving around for hours, and it only came out for less than 5 seconds.
i also suspect Fuel pump before, but why it was not there before and sound louder now? any idea bro?
i also suspect Fuel pump before, but why it was not there before and sound louder now? any idea bro?
Last edited by theboy; 11-21-2006 at 06:29 AM.
11-21-2006, 08:18 AM
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^^^ What he said. First thing I thought of was the sound the transmission makes when you're slowing down to stop at a light or whatnot and try to put it in first before you've stoped.
11-21-2006, 08:23 AM
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Originally Posted by bsteimel
do you have a manual? Is it your synchros and transmission spinning? If so it would be clearly audible when switching to first or second gears.
its not audible at any gear, it will appear when ever it want to.
11-21-2006, 08:25 AM
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Originally Posted by Atrain
^^^ What he said. First thing I thought of was the sound the transmission makes when you're slowing down to stop at a light or whatnot and try to put it in first before you've stoped.
11-21-2006, 12:16 PM
#15
Originally Posted by theboy
sorry but i am not a tech guy. what is synchros?
its not audible at any gear, it will appear when ever it want to.
its not audible at any gear, it will appear when ever it want to.
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
http://www.howstuffworks.com/transmission.htm
When pushing the clutch in and going to a lower gear when coasting you will hear the synchros working to speed up to the proper RPM before they actually engage the gear to the drive shaft.
11-21-2006, 03:26 PM
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It might be this: Secondary air injection pump. It provides air to the catalyst to limit emissions. It sounds as though it is located in the rear but it is actually under the hood (bonnet). When it starts to go, it makes a high pitched buzzing or whirring sound that sort of comes and goes.
11-21-2006, 06:12 PM
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Originally Posted by 4 years to Supercharge
Synchronizers
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
http://www.howstuffworks.com/transmission.htm
When pushing the clutch in and going to a lower gear when coasting you will hear the synchros working to speed up to the proper RPM before they actually engage the gear to the drive shaft.
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
http://www.howstuffworks.com/transmission.htm
When pushing the clutch in and going to a lower gear when coasting you will hear the synchros working to speed up to the proper RPM before they actually engage the gear to the drive shaft.
11-21-2006, 06:13 PM
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Originally Posted by Spok
It might be this: Secondary air injection pump. It provides air to the catalyst to limit emissions. It sounds as though it is located in the rear but it is actually under the hood (bonnet). When it starts to go, it makes a high pitched buzzing or whirring sound that sort of comes and goes.
11-21-2006, 06:37 PM
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It means that the next time you're in for servicing, tell the service writer about it. If I'm correct in identifying the sound, it's non-critical; just means it will take your catalytic converter a little longer to get to operating temperature. But then, I'm not an automotive technician and I'm not there to hear the actual noise.
11-21-2006, 07:12 PM
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Originally Posted by Spok
It means that the next time you're in for servicing, tell the service writer about it. If I'm correct in identifying the sound, it's non-critical; just means it will take your catalytic converter a little longer to get to operating temperature. But then, I'm not an automotive technician and I'm not there to hear the actual noise.
11-21-2006, 09:01 PM
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due to our oil pump is a in tank pump, so when low fuel, during cornerings, air would get into pump and make this noise. also at bumpy rides when fuel is not low. make sense cause the car was driven to a bumpy long distance road the same day. my question is why it happened to suck air after that? due to new fuel fomular that just been introduced?
11-26-2006, 09:11 AM
#24
Rotary lover
I also suspected the fuel pump, mine did the same, with full fuel or not,if you close windows and listen even when idle and you hear the spinning nearly as if it vibrates into the car body.
Then make ready for a soon to be replacing expensive fuel pump, it happened to me at only about 25000 miles
If it makes that noise in low fuel, i dont think its right, the pump casing or basket around it holds about a liter of fuel on its own if i am correct, so keep listening to the pump for a while, just in case.
Philip
Then make ready for a soon to be replacing expensive fuel pump, it happened to me at only about 25000 miles
If it makes that noise in low fuel, i dont think its right, the pump casing or basket around it holds about a liter of fuel on its own if i am correct, so keep listening to the pump for a while, just in case.
Philip
11-29-2006, 02:35 PM
#25
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It's probably the transmission. When you're driving slow, you gear less road/wind noise, your lower gears spin relatively fast and you hear it, not unlike the tranny sound when you reverse, no?
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