If it sounds like a can of marble balls rolling around in it

Then it's preignation due to carbon buildup. It happens when engine works hard. It could be reduced with higher octane gas. But the real cure is decarbon or swap to cold spark plugs. I did it and solved the engine pinging noise, the pre ignition issue, on my Infiniti years ago.

https://www.ngk.com/what-is-a-spark-plugs-heat-range-2

所有跟帖： 

• Thank you! -你家拉瓜- ♂ (0 bytes) () 09/29/2022 postreply 14:45:24

• 听起来像老话说的“敲缸”， 试试高标号的汽油。 -五大连池- ♂ (0 bytes) () 09/30/2022 postreply 05:51:21

• 谢谢！这个车可用87或85号油，我买了以后一直加的是87号 -你家拉瓜- ♂ (0 bytes) () 09/30/2022 postreply 09:09:56