- First Name
- Brian
- Joined
- Jul 18, 2020
- Threads
- 20
- Messages
- 2,719
- Reaction score
- 6,244
- Location
- Wisconsin USA
- Vehicle(s)
- 1990 Bronco eddie bauer
- Your Bronco Model
- Badlands
The fact that the failure is common to a single cylinder SUPPORTS the theory that it's a hardness/heat treat issue, doesn't refute it. Cooling is never 100% uniform in any engine...1 cylinder is always the hottest one, and 1 is the coolest one. It's not to say all the valves wouldn't have failed eventually...one had to be the 1st to go, and the motor doesn't survive that event to be tested further.The only problem with this hypothesis is that it was based on a QA issue of the valve metallurgy. Now I am seeing that the problem is with a specific cylinder. Plus, of course most of the failures are around mid 2000 miles because most of the Broncos out there are probably around that range of mileage. SO, I think my post is full of it now.
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