idle and a knocking sound

6905 Views 3 Replies 2 Participants Last post by  ramvan2500
When 5.9L is idling it has loose like knocking sound. Could this be the harmonic balancer and if so can this be fixed without hours of frustration.
Truck runs good besides that.
Plenum fix. Hughes kit
Iac sensor and map changed
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Found out my knocking sound was the water pump pulley.
The bearings were shot and grinding.
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