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Yeah, It will be interesting to see what went wrong. I’m guessing a bearing. I’ll probably wind up upgrading something while I’m in there. This is an expensive hobby.

I agree. This is pretty definitive.

I wish I could take it back to the builder but it was me. I had a bent rod, replaced the rod and piston. All new piston rings and rod bearings, gaskets and arp bolts. Here’s the audio of it driving last week when I first noticed it.

A few more notes: 1. I already tried a bottle of ceratec but it made no difference. 2. I went from 5w-20 conventional oil for the first 500 miles and switched to 5w-20 semi synthetic currently. Oil looked clean. 3. No error codes and the car seems to drive fine other than it’s rattling...

Couple of additional details. 1. Sound doesnt get better after it’s warmed up. Maybe worse. 2. I changed the oil a week before. 3. Engine was rebuilt about 600 miles ago.

Sorry, I forgot to mention that this is 2017 GT without DI. I thought the 2k rattle was a gen 3 Coyote issue?

I’m getting a new sound I can’t quite place. Is this rod knock, piston slap, lifters? It seems like a vibration? It started a few days after I replace the brake/clutch pedal assembly. I assume it is the most expensive option. :) any advice would be greatly appreciated.

Same side but it sounds like it’s close to the front. Maybe cylinder 5 or 6?

ran fine for 1/2 hour - waited an hour and started again - engine light came on within a minute Hydrolock bent a rod (cylinder 8).

I just performed a piston / rod (bent rod from hydrolock) replacement on a 34,000 mile 2017 Mustang GT. No damage to the block or cylinder walls. Replaced the one piston and rod with an identical factory part. Replaced all piston rings, rod bearings and all of the gaskets / non reusable...