Guys i had a issue on my corrolla axio 141. When the enjine get hot, hearing a noise like ටකටකටක..... (tractor noise) mostly when low rpms and the climb hills... the noise is improving when ac on. I changed throttle body, tune up, but no any difference... the mechanic say many things, but he has not an any idea what is it... i saw some asked before on this forum but he haven't mentioned any solution ....