ok, so I am looking to see if anyone else has experienced this with their Altima.

I have a 2005 3.5 SE with about 23,000 on it. I have noticed recently that when I have been out and about driving around from place to place, when I get back in the car, and start the engine, say, in a parking lot, if its quiet, I can hear this faint knocking sound. I can't tell what it is, but it is getting louder. It doesnt change as you are driving, and it doesnt get louder or softer at all, but it is definitely noticeable. It seems to mostly happen when the engine is hot. It also seems like I can feel a vibration in the gas pedal along with the sound. Anyone have any ideas, or have experienced this yourself? Let me know...

 

my 2003 altima 3.5 did the same thingand the dealer said that they have this problem pretty ofetn mine was a timing chain tensioner gear or somthing like that it is the timing chain i know that it oes not hurt the car although does give you slightly less horsepower because of it

 

Aside from the transmission the hawk brakes may have been disrailed and or have cracked that .Doing self repairs may not help you at all.

 

your car is still under warranty 3 year 36,000 mile warrenty, use it while you still can. take it to the nissan dealer asap, also make sure to check your oil level if its knocking on startup.