Idle rattle....sometimes
#1
Idle rattle....sometimes
Hi, new to the forums and I know there are endless discussions on this topic but I have yet to find an instance with my specific symptoms. I have recently purchased a 2008 g35s 6mt sedan 90,000 miles. I know everyone says the car has a loud transmission but I'm getting a rattling sound coming from the center of the car (where the tranny should be) at idle but It doesn't always make this noise. One thing I notice is when I press the clutch in it goes away immediately. I've seen this issue all over the forums but herd nothing about the idle rattle going away on its own sometimes (without pressing the clutch).
#4
BTW, when was the last time the gear oil was changed in the tranny?
#5
I just bought the car about a month ago so I'm not really sure, didn't see anything about it in the service records. Would flushing the gear oil help eliminate the sound??
#6
Yeah, if the gear oil is old and cooked it will definitely contribute to the noise, so you might try changing it. Be aware though, it is the nature of the beast to some extent. Even with fresh oil, under the right conditions these trannys can still make some rattle; some more than others. That is why they use the dual-mass flywheel to try and dampen the impulses coming from the (relatively) harsh V6 attached to it. If you are sensitive to the sound at all, you want to be sure that when it comes time to change your clutch, you never go with anything other than a dual-mass flywheel.
#7
Yeah, if the gear oil is old and cooked it will definitely contribute to the noise, so you might try changing it. Be aware though, it is the nature of the beast to some extent. Even with fresh oil, under the right conditions these trannys can still make some rattle; some more than others. That is why they use the dual-mass flywheel to try and dampen the impulses coming from the (relatively) harsh V6 attached to it. If you are sensitive to the sound at all, you want to be sure that when it comes time to change your clutch, you never go with anything other than a dual-mass flywheel.
I herd this specific car is loud and you hear everything. I've only had it for a month and I'm a bit paranoid plus I have never owned any nissan/infiniti prior to this one. Thanks for your insight. Much appreciated
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#9
#10
Yea check the heat shield, i recently had a raddle, checked under the car (basically in line with the drivers seat) and one of the clamps had rotted out so i just took it off and replaced it with a hose clamp
#12
I apologize for not being specific enough. Rattle might not be the right word. It's more like the normal sound coming from the transmission gets louder. Maybe a little "rattley" but not the type you would associate with a loose heat sheild. It's not terribly loud but it's definitely not just the normal sound of the car. I usually notice it after driving for 10 or 20 minutes so I'm starting to believe it is just the transmission heating up. I plan on flushing the tranny fluid and most likely the differential while I'm at it.
#13
#14
Update: so I've replaced the gear oil in transmission and differential, and at first I noticed a big difference and how my transmission sounded after some spirited driving. This lasted about 2-3 months before making the harsh sounding rattle coming from what I believe to be the transmission. It doesn't sound as bad as before and only acts up after driving somewhat spirited for 30 mins+. I've done research on general car problems and what came up isn't too promising. From what I could find, it seems like the problem may be my input shaft bearing. I have no idea how bad this problem is and how to go about fixing it. Should I act now or let it the bearing take its corse. Thanks in advance for your insight.
#15
Update: so I've replaced the gear oil in transmission and differential, and at first I noticed a big difference and how my transmission sounded after some spirited driving. This lasted about 2-3 months before making the harsh sounding rattle coming from what I believe to be the transmission. It doesn't sound as bad as before and only acts up after driving somewhat spirited for 30 mins+. I've done research on general car problems and what came up isn't too promising. From what I could find, it seems like the problem may be my input shaft bearing. I have no idea how bad this problem is and how to go about fixing it. Should I act now or let it the bearing take its corse. Thanks in advance for your insight.
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