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Ultramaroon · 03-13-2018, 02:20 AM

It's just the gearbox. All the gears rotate whenever the input shaft spins. When the engine spins slowly, the firing pulses cause the gears to rattle a little.

The AC increases the load on the engine at idle so you get more of the rattle.

Normal.

03-13-2018, 02:20 AM	#9
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,867 Thanks: 52,127 Thanked 36,519 Times in 18,920 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	It's just the gearbox. All the gears rotate whenever the input shaft spins. When the engine spins slowly, the firing pulses cause the gears to rattle a little. The AC increases the load on the engine at idle so you get more of the rattle. Normal. __________________ service manuals