I’m having a hard time tracking down a noise from the engine that only happens during cold starts. It sounds like someone playing a cabasa and gradually fades away after 2-3 minutes. I have a mechanics stethoscope and have listened to virtually everything I can think of under the hood. Checked, all accessory pulleys/bearings, water pump, SAIS valves and pump. Timing belt service was completed about 14k miles ago. Noise started within the last 500 miles. Truck is also running a little rough at idle, but not throwing any codes. I scanned today using techstream.
The noise is still present with the serpentine belt removed. I can only replicate the sound about once per day an the very first cold start so I don’t have a lot of time to listen. I had it at the shop that replaced the timing belt this past week and they could not trace the source and claimed it was difficult to replicate the noise reliably.
Looking for some suggestions on what parts to listen to when I start it up tomorrow.
The noise is still present with the serpentine belt removed. I can only replicate the sound about once per day an the very first cold start so I don’t have a lot of time to listen. I had it at the shop that replaced the timing belt this past week and they could not trace the source and claimed it was difficult to replicate the noise reliably.
Looking for some suggestions on what parts to listen to when I start it up tomorrow.
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