Now What-- Misfire to Egr to Check Hybrid System

Bone up on head gasket replacement, just in case.

Doesn't seem to be possible to replace just that white plastic collar that broke.

 

Bone up is canadian for study the process before doing it if and when needed.

Coolant does not normally go down even if not touched for years. So Mendel is preparing you if the worse happens and it rattles again.

A borescope test is the right thing to do; an egr does not cause rattling. It can cause stumbling accompanied by an egr code caused by the egr sticking open at low rpm's and startup. A egr test is run almost every drive time and will code if the egr is either sticking open or clogged completely.

Borescope test with quality dual view tool

 

It's ok and some mobile guys do exactly that. But if you don't have experience it can be several days worth of work. Usually a rebuilt of the head by a machine shop is recommended. Doing it in the car (instead of pulling the engine) makes experience even more valuable as doing the timing chain can be tricky and has caused redos by some. Knowing the scope of the problem is sometimes difficult. If it burns oil now it will burn oil later.

 

Do you have a garage? Even if it would mean some temporary removal of stored items, that'd be preferable for comfort, convenience.

 

Agreed on definition, but origin might be US:

Partial quote:

"Bone up" appears to have developed from the simpler verb form "bone," as J.E. Lighter, Random House Historical Dictionary of American Slang, reports. Several early instances of bone or boning in this sense are recorded from the U.S. Military Academy in West Point, New York, starting in 1859. The earliest match for "bone up" (or rather "boning up") is from 1877, from the University of Michigan.

From:

etymology - Origin of "to bone up on something". - English Language & Usage Stack Exchange