Replaced the head gasket recently after it overheated a couple times, then a couple days later ran a can of seafoam through the vacuum hose. As I was sucking it in, I started hearing a tapping sound. It sounded similar to a noisy lifter I had in a ford ranger. I drove it a couple days to see if it would go away, but it hasn't. If anything, it's either gotten worse or it just seems worse because I'm worrying about it. It also seems to have turned into more of a knock than a tap, but that may just be me fretting too.

You can hear it if you're around the front of the jeep at idle, and inside the cab when you're accelerating.

Suggestions?

 

Overheating an engine is never good.

 

Check exhaust and intake bolts a exhaust leak can sound very similar toa lifter tick...jm2cw.

 

I'll check those, but pretty sure that's not it. Any other suggestions? Ideas on why it would start doing it while I was seafoaming it?

 

Sea foam has a 50/50 opinion around here my opinion is not allowed to be used unless were in the underground section. Pouring liquid into a intake systems very dangerous.

 

Yes. You may have cracked a piston or rod. A liquid does not compress.

 

OP, this is important, did you pour the seafoam or did you just put the vac line into the can and let it do its own thing