I have a 98 Jeep Wrangler, it runs great. However after driving it on the highway or for a long period of time after the engine idles down the engine starts making a ticking sounds. The noise gets louder as the RPMs goes up. I had the oil pump check and replace the sending unit thought that might have fixed the problem. But if I let the engine sit for 20 mins and start it up again the noise is gone until it heats back up. I think I might know what it maybe but wanted to hear from other Jeep owners that may have experience the same thing. The Jeep only has 98K miles on it.
Expansion after it reaches temp would be the dreaded exhaust leak. Check intake exhaust bolts/studs and the check the exhaust pipe where it meets the exhaust manifold.
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.
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Power steering pumps have been know to make cyclic ticking noise when they are having issues. I'd imagine if you search there will be some threads about it. Mines done it a couple times but then it went away before I got around to replacing the pump. First time it happened I spent a chunk of time with a stethoscope under the hood and it was definitely the PS pump.
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