i am experiencing frog or cricket noises around the timing belt area of the engine. they remain constant and fairly loud when the engine is slightly cold, ie not started for a while. is it a bearing? is the belt to loose? the noises can go away for a little while after a drive but come back when its started again or idling. the noise kind of sound like its coming from the timing pulley on the drivers side, tried wd40 and it didnt work at all. help?