Stuck bolt help?

this is what I would try had pretty good luck in the past and it wont strip out the torx hole too

 

Put Kroil on and tap with the handle of a screwdriver. Nothing hard needed. Maybe repeat this a few times each day. Then take hand impact driver and try to TIGHTEN it. Then reverse direction and loosen. Back and forth. It will come off with this method.

 

Well, I got it AND salvaged the bolt.
Soaked top of bolt & exposed threads underneath w/ PB blaster while I was changing spark plugs.
Tried it & still wouldn't budge.
So I used MAP gas & torch to get the welded in nut underneath pretty hot. It came out easy enough w/ a breaker bar & a new torx bit.
I cleaned up the rusty bolt on the wire wheen & put anti-seize on the bolts I took out.

Appreciate all the feedback!

 

Glad you got it OP. I have had success with PB blaster and Atf/acetone mix.

Anyone try Toyota penetrant fluid?
00289-1RP00

Genuine Toyota Fluid 00289-1RP00 Rust Penetrant - 11.5 oz. Can

https://www.amazon.com/Genuine-Toyota-Fluid-00289-1RP00-Penetrant/dp/B00C392ZKE

Is it any better than the other stuff on the market? Getting info in the event I need to remove exhaust manifold nuts, want to prevent snapping the studs.

Id think about heat but its a tight space.

 

Tighten it some first, then back it out. Pull any rust on the threads apart before trying to pull it through the threads.

 

Induction heaters work extremely well, especially in tight places where you don't want open flames.