Need help diagnosing engine noise
Lead Driver
Joined: Nov 2020
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From: Sportsman's Paradise
Hard to tell from that 2nd video but the 1st video sounds like a collapsed lifter. There were issues with the early 5.0 engines in that the cylinders were not milled perfectly round creating a knocking but that tap I hear doesn't sound heavy enough to be that, I'd need to put a mechanics stethoscope on the engine to pinpoint the tap and go from there.
Cross-Country
Joined: Oct 2022
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From: iowa
lifter or broken valve spring leaving a valve hanging slightly open. put a piece of hose to your ear and other end on valve cover move it along cover till its loud there is your problem. never heard exhaust leak sound like that
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4wd Low
Joined: Aug 2007
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Thanks for replies, much appreciated. It doesnt seem to knock/tap at idle. Its loudest when I hold the brake and apply some throttle and "load" the engine. Not sure if that's helpful info. I'll get a stethoscope and see if I can isolate it. Is a lifter and/or valve a repair process? Or would I have to buy a new head?
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Lead Driver
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From: Sportsman's Paradise
The lifters, aka tappets, aka hydraulic lash adjusters can be replaced without pulling the head.
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From: Southern California
Not necessarily.....the cast iron swells when heated closing the gap..... seen this before...
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4wd Low
Joined: Aug 2007
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I spent 30 mins under the truck with a stethoscope last night. It certainly sounds like its coming from the bottom of the engine, towards the back. In fact, I cant tell if its coming from the transmission bell housing area or the engine. With the stethoscope its a very distinct metallic "ting ting ting" sound. Im 90% sure its not related to the valves/cams/lifters. I really dont think its an exhaust leak either. Any ideas?
Lead Driver
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From: Sportsman's Paradise
Engine running unplug one at a time each coil or injector, which ever is easier and see if the sound changes or goes away. If so note the cylinder #.
Good chance it's that oblong cylinder cut issue I mentioned before.
Good chance it's that oblong cylinder cut issue I mentioned before.
Lead Driver
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From: Sportsman's Paradise
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4wd Low
Joined: Aug 2007
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Only fix for that is a new block. I would see if you can locate a good used low mileage engine to replace it with. LKQ.COM will be your best bet for that. They also give a warranty with most everything they sell. I bought a Taurus SHO v8 engine from them once upon a time. They also deliver.
Lead Driver
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From: Sportsman's Paradise
It only affected 11 and some early 12's. 13 and 14 should be good and will fit right in place.