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Old 02-07-2019, 06:34 PM
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A long-shot, but needing to diagnose an unusual sound...

2006 4.8is just turned 111,000. Last week had the valve cover gasket, upper timing cover gasket, AGA coolant pipe w/valley pan, valve stem seals, CCVís, BavAuto perf coils, sparkplugs, logic7 thermostat, and vacuum pump seals. Now, aside from a wet weep hole, truck had no pre-existing conditions and everything else was performed preventively. In the three times Iíve driven since (<100mi)...everything seems great EXCEPT for some kind of annoying howl sound coming from drivers side front. It is only noticeable under load and seems to be unrecognizable past 2500rpm. With so much maintenance done all at once...I donít even know WHERE to start looking. I was just hoping it might be familiar to someone else??? Thanks for any feedback!


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Old 02-07-2019, 06:50 PM
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Take some video. Recently other people have traced similar sound to misaligned pulley on the serp belt.

Take off the belt and see if the sound goes away.. (do when engine is not full temp since no water pump when no serp belt)


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Old 02-08-2019, 09:40 AM
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Awesome suggestion. Iíll check this early next week and report back! If unresolved, Iíll take video. Thank you!


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Old 02-08-2019, 02:13 PM
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So it's only under load? Can't hear it when parked in the driveway below 2500 RPM? If so, that will make it tough to do the no-belt test (tough to drive with no power steering; lack of fan and alternator will be OK for short drives).

Is it definitely load+RPM related, vs. speed related (coasting down a hill, for example)?

Will be tough to diagnose if it does not happen when parked, but careful answers to those questions might help.

But if you can replicate the noise when parked, then the no-belt test is a great one. I usually start with that when tracking a noise. A tip to go along with that is that they make special belts (e.g., Continental Elite) that are specifically designed to address slight problems in the pulleys that create noise. Of course it would be great to fix any issue with a pulley, but sometimes the problem is slight enough that just changing to one of these special "problem" belts will effectively eliminate (mask) the problem.
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Old 02-08-2019, 02:35 PM
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Solved...

I could not replicate any of the noise when parked (even lifted). I hoped that this could possibly point to airflow related. So, I tore apart my cowling, where I had not been too concerned about fit upon reassembly because I bought the truck 12mo ago with all of those little plastic spring screws popped up. Anyway - I could not tell after disassembly of cowl, cabin filter holder that anything was amiss, but when I re-assembled it...was VERY cautious to ensure everything was fitted just right (I just could not lock anything into place). Well, the noise is gone and truck drives JUST right! I really wish those spring-loaded screws were sold individually or could resist failure past a few uses. Thanks to those who offered advice, and I will be looking into those upgraded belts at my next replacement!

Adam
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Old 02-08-2019, 11:27 PM
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Agreed on the spring nuts. At $150 for a replacement cover I think I'll invent a proper cure for the spring nuts. I'm betting I can put a roll pin in to replace the broken plastic or something similar.


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Old 02-08-2019, 11:57 PM
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Quote:
Originally Posted by ajacks8 View Post
I could not replicate any of the noise when parked (even lifted). I hoped that this could possibly point to airflow related. So, I tore apart my cowling, where I had not been too concerned about fit upon reassembly because I bought the truck 12mo ago with all of those little plastic spring screws popped up. Anyway - I could not tell after disassembly of cowl, cabin filter holder that anything was amiss, but when I re-assembled it...was VERY cautious to ensure everything was fitted just right (I just could not lock anything into place). Well, the noise is gone and truck drives JUST right! I really wish those spring-loaded screws were sold individually or could resist failure past a few uses. Thanks to those who offered advice, and I will be looking into those upgraded belts at my next replacement!

Adam
Brilliant, thanks for posting the solution!
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Old 02-08-2019, 11:59 PM
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Quote:
Originally Posted by andrewwynn View Post
Agreed on the spring nuts. At $150 for a replacement cover I think I'll invent a proper cure for the spring nuts. I'm betting I can put a roll pin in to replace the broken plastic or something similar.


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Please let us know if you come up with something. I'll see if I too can come up with a clever (aka simple) solution and post back.
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