After a timing belt, water pump, and thermostat replacement, a persistent engine noise emerged. Initially suspected as timing belt tension, re-tensioning didn’t resolve the issue. A shop attributed the noise to engine wear, recommending oil additives. An oil change without additives proved ineffective. A dealership diagnosed the noise as originating behind the timing belt cover, quoting a hefty inspection fee.
Further inspection with a family mechanic revealed a loose tensioner pulley on the drive belt, accompanied by a rattling sound when spun manually. Slight play was also detected in the water pump pulley. The noise ceased when the car was shifted into reverse, raising suspicion about the transmission. The transmission fluid appeared dark and overfilled.
Currently, a new tensioner has been ordered and awaits installation. A transmission fluid change is also planned. Hopefully, one of these actions will eliminate the noise. Additionally, there’s a question regarding normal idle RPM for these vehicles. The current idle range is 450-500 RPM, which seems unusually low.
