I have a 1994 Toyota pickup with 104,000 mi. I've had it for about 2 months and had noticed a ticking sound coming from the engine. The previous owner had been great with keeping up with oil changes, but not much else. His handwritten service notes indicated an "engine overhaul" ten years ago so I figured I should start by catching up the maintenance. I changed the spark plugs & wires and distributor cap, and flushed the coolant. Then I adjusted the valves. I have a Hayne's manual and followed the instructions & clearance specs they give, and now there is a worse knocking. I'm wondering if I should put the valves back to where they were or what else would be causing the knocking after the valve adjustment? I think I can also still hear the ticking under the louder knocking. The thermostat had been stuck open so I thought maybe the engine hadn't gotten hot enough to adjust the valves properly, but even after changing that & getting the engine hotter it didn't make much difference with the valves.