so i've been trying to diagnose a problem with my 1st gen 2.4L taco for some time now. its a clicking noise that only happens on start up when the truck is warm, it wont happen on first start ups in the morning. it sounds like an exhaust leak/vibrating/rattling noise coming somewhere from the intake manifold area.
I've replaced all exhaust gaskets and exhaust manifold gasket and have ruled out the exhaust system including the cat. Does anyone know what this can be? theres an EGR tube running from the pass side cat to the intake mani and its not that either, but it maybe something attached to the intake manifold.
Once the car has been driving after a warm start, it'll go away. but if i turn the car off, let it cool for maybe 4 - 5 minutes or more, start it again it'll make this horrible loud clicking / vibrating again.
anyone have any idea of what it can be? i thought it would have to do something with the exhaust system since it may seal up when it heats up again but its nothing in the exhaust, if anyone has any insight or has ran into this problem before please let me know! thanks for the help in advance!