Noise in the engine after heating

Greetings and blessings for today I would like to consult about a problem that I have with three motor rates the problem is the same in all three. Because of the owners, the cars have had strong warm -ups in the engine, after solving problems such as covered radiator, stuck or simple thermostat that did not put refrigerant the caviles have a noise in the engine, it is like the sound made by the diesel engines but not so strong and only do it when they go on a rise (slope). The cars do not apparently work normally but the noise is there, someone has some idea that it can be

I need more information. If so disassembled the butts. If the cars are of the same brand and model .I

Hello friend I had two Daewoo nuance and they always suffer or tend to barefoot some of the valves just like the Chevrolet Spark and it shows or listens stronger to what you upload a slope. If you want to write down my email and sent you the entire mechanical and electrical manual of this car. Write me from your email to send it to you. Greetings from Venezuela.

Thank you for answering the cars are three corollas who are never touched by the cylinder head or time girdle in one of them I realized that I started making that noise during heating and it was left after there now in these days you change packaging or browning of a Kia Sportage is sent to rectify the butt the time is at your points you do not use the distributor. He says that he did not do it before warming by asking with mechanics have told me that time can be advanced but as I tell you, the time of the other cars is never touched on what I am sure is that they were like this after heating