Does it sound after the truck has warmed up to operating temps?
If it does, possible lifter problem...Pull the intake and check the lifters and pushrods.
I've personally dealt with a 3.8 in the Wrangler that ticked (put new lifters and pushrods in) and found out after taking apart the head it was on... it was a part of a valve guide that was broke and making the noise.
If it does, possible lifter problem...Pull the intake and check the lifters and pushrods.
I've personally dealt with a 3.8 in the Wrangler that ticked (put new lifters and pushrods in) and found out after taking apart the head it was on... it was a part of a valve guide that was broke and making the noise.