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2005 4.6l low rpm ticking noise

 
Old 05-22-2019, 10:44 AM
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Default 2005 4.6l low rpm ticking noise

Hey all,

First post here so please go easy.

For the last 6 months or so I've been hearing a ticking noise coming from the passenger side of my truck and annoyingly, its been quite hard to diagnose as it only happens under the following conditions:

- Truck is in D and moving
- RPM is under 2100
- Truck is warmed up

Couple of observations:

- It ticks regardless of what gear its in
- The ticking increases frequency with RPM,
- the noise tails off and becomes inaudible above 2100 RPM.
- If i put the truck in park and rev the engine there is no ticking either.
- No discernible impact to performance

I've done a lot of reading on this and it doesn't seem like the infamous cam phaser issue that plagues the 5.4's. My father in law thinks it may be the catalytic convertor but I'd expect that to rattle even at idle if the core was loose inside.

I'd love some help with this. I linked a video (because upload size was too large) so you can all hear it for yourselves:

Thanks a lot!
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Old 05-22-2019, 10:48 AM
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Sounds like a cracked exhaust manifold to me.
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Old 05-22-2019, 10:50 AM
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sounds like an exhaust leak to me I would have the cats checked out as well just to rule them out
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