[Zag300zx]

Hey guys, I'm fairly new to the STI scene. I had an 02 WRX about two years ago. Just sold my 300zx Twin Turbo for an STI and love every minute of it. I do miss the T-Tops however...

Anyways, I bought an 06 stock AW with 2600 miles. I am having a strange noise however. When I push the car just a little, shift at say 5k, when I push the clutch in, and consequently let off the gas, there is a decently loud "pop" coming from under the car. You can feel it sligtly. It does it usually in first or second gear, only if I push it a little. It is definatly not the blow off valve (as that is usually a "woosh"). Could it be the car is backfiring on shifting? Maybe drivetrain noise? Any help would be greatly appreciated...I wish to solve this before I install my accessport which may void the warranty.

[Wes]

might be a backfire or might be some kind of diff noise

[hulk252]

Sounds like that famous "klunk". Only when shifting hard, right? They have the klunk killer for that. Check out turninconcepts.com if it bothers you.

[Zag300zx]

No no it only happens the moment I push the clutch in, not when I shift hard. I can feel it through the clutch pedal mostly. I should probably just take it to the dealer...

[Chris05STi]

Yah take it to the dealer and have them look at it. Your rear diff may be making that popping noise.....hard to say.

[itr_1211]

if you have an 06 and plastic engine mounts, check to see if they're gone

[Digitalfiend]

Originally Posted by itr_1211

if you have an 06 and plastic engine mounts, check to see if they're gone

That's what I would suggest too, especially if it happens all the time. Also, someone else here just had a similar clunk problem that turned out to be a bracket near the downpipe that was allowing the exhaust to contact the car, resulting in a thunk.