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Old 07-24-2009, 08:26 PM   #1
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Engine noise

Hi new member here. Need some help my motor has a tap/knock not there at start up seems to get worse as oil heats up. Only doe it at idle.just touch gas goes away no noise under load either.The noise is loadest when i shut off engine as it stops. Seems to come from front of motor valve cover is quiet don't thinks it valves.Any ideas?
Thanks
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Old 07-24-2009, 08:55 PM   #2
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check for exhaust leak at manifold

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Old 07-24-2009, 09:03 PM   #3
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No is not an exhaust leak ,thinking oil pump really not sure though
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Old 07-24-2009, 09:06 PM   #4
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maybe if you link a video, i or someone else here can help.
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Old 07-24-2009, 10:48 PM   #5
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does it sound like this ?
or like this
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Old 07-24-2009, 11:20 PM   #6
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Coming from front of engine...goes away underload? Check timing chain. Might be getting a bit loose.
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Old 07-25-2009, 07:39 AM   #7
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Does sound like that, but goes away when you raise idle that one seemed to still be there as idle was rasied.Sounds like second too but does that one go away when idle was raised? My motor sounds great when idle is rasied or when under load and driving.
Timing chain could be it. Maybe the tension?
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Old 07-25-2009, 11:41 AM   #8
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I'm thinking. Not that hard to get to. How many miles?
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Old 07-25-2009, 12:14 PM   #9
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Has almost 100.000 miles.
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Old 07-25-2009, 04:32 PM   #10
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i'm not sure but it could be a lifter sticking too had it happen in my 305 changed the oil went away never came back caused by junk in the oil getting stuck in the guides and can make it sit just high enough to tick the cam but i had termendious loss of power though
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Old 07-28-2009, 08:28 PM   #11
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So i was just wondering sounds like the second video. Should i go with the timing chain change it and damper, or is it something else? Bearing or oil pump?
Thanks in advance for the help.
Rich
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Old 07-29-2009, 02:29 AM   #12
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By your description I would go with the timing chain. The videos did nothing for me. Kind of tone deff. (8years in the Marines) Good luck.

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