Idle knocking noise

[Ultramaroon]

Originally Posted by Sigh-on-Rice

I thought Kostamojen's issue is neutral rollover. Mine makes the noise when the RPM is at around 650. When the car is warmed up, the engine idles at 600, so it doesn't make the noise. But when the AC compressor is on or engine is not fully warmed up, the RPM stays 650-700 and that's when it makes rattling noise. Also, when the engine is idling at 600 and I tap the gas pedal, it makes the same noise as in Kostamojen's first video. I thought that noise was from when the engine RPM passes through 650-700, it was making that rattling noise for a moment.

Another thing I learned from this forums is this noise gets louder after a transmission oil change. I had throw out bearing and pressure plate replaced a little less than a year ago. I was expecting the noise to get louder because the transmission oil would be changed also. As I expected, it got louder. But I didn't worry about it since I knew that would happen.

Kostamojen mentioned he got throw out bearing and clutch disc replaced a couple months ago. That means the transmission oil was changed a couple months ago. This might be why he didn't notice the noise before, but only noticed it recently.

I hope Kostamojen's issue is nothing, because mine makes the same noise doing the same thing.

I hope the best as well. I get the same effect as you mentioned above but it's only momentary. Kosta's is loud and constant.

I swapped mine out with Redline at about 10K miles. It's a tad noisier but nothing like that. Is it possible the oil level is low? I'm reaching.

[csmith171]

Did you ever figure this out?

[csmith171]

Any luck?

Originally Posted by Kostamojen

Ive been having this knocking noise occasionally at idle and now lately Ive had some idle issues where the car feels like it wants to stall at a stop. No check engine lights and stock exhaust currently with stock ecu tune.

Anyone have something similiar or knoe what this is?

[BRZnut]

Could it be another vacuum pump failure like this guy?

http://www.ft86club.com/forums/showthread.php?t=107577

[vanko25]

Have you figured what was causing the issue? I had clutch and tob replaced and 2 months after it started knocking in the same manner as in the video. Thanks!

[vanko25]

No one has any updates on that? It will be great to hear for a fix. Thanks!