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Update on the troubleshooting:
I took the wagon down the street to my mechanic to see what he could find via compression and leak-down test. Same results as above.
He confirmed that the #5 cylinder (closest to firewall) is the one correlated to the rough idle. He cracked the injector line and the nailing sound went away.
He also flushed the cooling system and noticed that the coolant seemed to be free of oil coming out. The reservoir was nasty, however. So he cleaned it out and ran it a few times to see if any oil showed up. Nothing so far.
I doubt the issue fixed itself, however we did recently reconnect the heater core to get the heater working again. The core was bypassed because the input and return lines were leaking (which we replaced)-- the core itself was fine.
I'm curious if it is possible that the core could have had old gunky coolant residue flushed out into the reservoir, which subsequently coated the inside when coolant retreated back into the system. It is a far fetched theory I thought of, and I don't really believe it myself, but I'm wondering if it is possible. Not getting my hopes up here.
Aside from that, we are going to remove the injectors and prechambers to borescope the cylinders. This way I can get an idea of what I'm in for on the bottom end.
If the cylinders look healthy, we will conduct another leak down (this time visually verifying exact TDC), visually inspect the valves from the inside with the borescope, then proceed to a good Kroil soak and see what that does to compression.
If we're looking good at that point, I am going to check out the injector service Greazzer offers.
Worst case: need to find a good used motor, or all-in on a Metric.
Likely case: head gasket and head machining, rebuilt injectors- or good used motor.
Best case: the oil I noticed was really just nasty old coolant residue trapped in a part of the system that hadn't seen use in MANY years, rings just need a good soak and rebuilt injectors to top things off
Pic of nasty coolant attached (prior to flushing).
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1983 Mercedes Benz 300TD (wagon)
1963 Volkswagen Type 34 (Type 3 Ghia)
2017 BMW i3 BEV
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