So I've noticed a banging/rattling at idle so I crawled under my jeep and have kind of pinpointed it to the front bottom end of the motor. I want to say its the crankshaft pulley, however I am wondering what else it could be? It's a 4.7 with 115k on her. Thoughts??
2007.5 WK Laredo
- OEM+ -
is it a consistent sound that's always there at idle, or is it intermittent?
happens when the engines warm or cold, or doesn't matter?
Doesn't happen at start up, takes a minute but once the rattle gets going its pretty constant at idle.Originally Posted by Matt
2007.5 WK Laredo
- OEM+ -
Take the serp belt off. Manually spin all of the pulleys to see if there's a dead giveaway. If you're unsure, start the engine with the belt off and see if the noise is there (won't hurt anything to run it like this at idle for a few minutes... just watch the temp gauge)
i noticed it does it more when there is not load per say on the engine- when im sitting in neutral, foot on the brake just idling its more constent. when its in drive and i have my foot on the brake it does it but its more intermittent.
2007.5 WK Laredo
- OEM+ -
well.... found the source of the sound- bad crankshaft pulley. after stopping for gas yesterday and popping the hood while it was running, you can see the crankshaft pulley has some play it in at idle, theres a bit of a wobble to it.
so im thinking ill be ordering a new one from rockauto, local shop wants $200 to install it
2007.5 WK Laredo
- OEM+ -
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