Q: Hi i recently replaced my water pump and timing belt tensionerand idler pulley nowcthe car is rumbling at idle do you think the cr

I would first try removing the accessory belt to pinpoint the issue. Once it’s off, start the engine and check if the noise is still there. If it is gone then you’ll know that the noise is one of the accessory pulleys. If this is the case, turn on each one to see if one is noisy. Thealternatormay be noisy. Also, double check to make sure the crankshaft pulley is tight. If you need some help with these checks or repairs, contact a certified technician, like one from YourMechanic, who candiagnose your rough idle并帮助您相应地修复它。