Need help with a misfire issue

[KTScruiser00]

Yes. It was in fact a BHG. ~$7k later, I am 30k miles into the new HD with no issues.

 

[94SRUNNER]

Yes. It was in fact a BHG. ~$7k later, I am 30k miles into the new HD with no issues.

View attachment 4037627

Whoa!

Any idea the cause?

 

[KTScruiser00]

Whoa!

Any idea the cause?

Can only speculate. It has never overheated under our ownership and the person we bought it from did a good job keeping up with maintenance. We had not done a coolant flush on it so maybe it was really old coolant become acidic and eating away at the gasket? Hard to say. Regular coolant swaps will be a thing for us moving forward!

 

[94SRUNNER]

Can only speculate. It has never overheated under our ownership and the person we bought it from did a good job keeping up with maintenance. We had not done a coolant flush on it so maybe it was really old coolant become acidic and eating away at the gasket? Hard to say. Regular coolant swaps will be a thing for us moving forward!

I agree regular coolant flushes are necessary for these engines (really all vehicles). I am doing them about every 45K.