A ticking sound has been coming on when engines cold, today it was louder out of nowhere and kept going when warm. I thought it was valves but listened and felt around the engine, felt the fuel rail and I'm almost certain that's where the ticking is coming from. If it was valves I should feel it on valve cover more so I believe. couldn't feel any ticking on valve cover or intake manifold. any input would be great, ive heard of the 90s Yota tick but never had it on my 5vz or 3rz. mahalo