Hammer gnome?
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Mountain Pass
Joined: Sep 2017
Posts: 203
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Hammer gnome?
Does anyone else have a gnome who lives under their truck and hammers on things?
On loaded accelleration (ie, heavy engine lead like first taking off from a stoplight or accelerating up a hill) it sounds like someone is hammering on sheet metal under my truck. The rhythm is slow and not at all related to engine speed. I cannot for the life of me figure out what it is. All u-joints seem to be in good shape, no rubbing of tires that I can find... I just have no clue. I'll try and shoot a video later tonight.
On loaded accelleration (ie, heavy engine lead like first taking off from a stoplight or accelerating up a hill) it sounds like someone is hammering on sheet metal under my truck. The rhythm is slow and not at all related to engine speed. I cannot for the life of me figure out what it is. All u-joints seem to be in good shape, no rubbing of tires that I can find... I just have no clue. I'll try and shoot a video later tonight.
Logistics Pro
Joined: Jul 2005
Posts: 4,217
Likes: 154
Does anyone else have a gnome who lives under their truck and hammers on things?
On loaded accelleration (ie, heavy engine lead like first taking off from a stoplight or accelerating up a hill) it sounds like someone is hammering on sheet metal under my truck. The rhythm is slow and not at all related to engine speed. I cannot for the life of me figure out what it is. All u-joints seem to be in good shape, no rubbing of tires that I can find... I just have no clue. I'll try and shoot a video later tonight.
On loaded accelleration (ie, heavy engine lead like first taking off from a stoplight or accelerating up a hill) it sounds like someone is hammering on sheet metal under my truck. The rhythm is slow and not at all related to engine speed. I cannot for the life of me figure out what it is. All u-joints seem to be in good shape, no rubbing of tires that I can find... I just have no clue. I'll try and shoot a video later tonight.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
X2. That's what I would look at. Especially the driver's side motor mount. If it's bad, under hard acceleration, the motor can actually lift off of the mount. If there's close clearance on something like the exhaust, that could allow it to contact the frame, cross-member or body and make the sound you're describing.
Tuned
Joined: Oct 2010
Posts: 357
Likes: 11
From: Roanoke, VA
Does anyone else have a gnome who lives under their truck and hammers on things?
On loaded accelleration (ie, heavy engine lead like first taking off from a stoplight or accelerating up a hill) it sounds like someone is hammering on sheet metal under my truck. The rhythm is slow and not at all related to engine speed. I cannot for the life of me figure out what it is. All u-joints seem to be in good shape, no rubbing of tires that I can find... I just have no clue. I'll try and shoot a video later tonight.
On loaded accelleration (ie, heavy engine lead like first taking off from a stoplight or accelerating up a hill) it sounds like someone is hammering on sheet metal under my truck. The rhythm is slow and not at all related to engine speed. I cannot for the life of me figure out what it is. All u-joints seem to be in good shape, no rubbing of tires that I can find... I just have no clue. I'll try and shoot a video later tonight.
Senior User
Joined: Mar 2017
Posts: 395
Likes: 1
From: Everton MO
my old muffler was a really long slim one and when i had it replaced with a flowmaster 50 it would rattle against the old heat shield so i took the old one off. motor mounts and transmission mounts would be a good one to check. I know my engine moves alot more when its under a load.
does anyone know if tightening the mounts will help if the rubber is a little flattened or should you replace it?
does anyone know if tightening the mounts will help if the rubber is a little flattened or should you replace it?
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Hotshot
Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
If your mounts have compressed, it's time to replace them.
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Mountain Pass
Joined: Sep 2017
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Thanks so much for all the info. I haven't got a change to shoot video yet. But it does sound like drivers side. The thing is it isn't one clang. It's clang clang clang till you eaxe up on the throttle.
No it doesn't do it in park. only under load. And again it's not related to rpm or engine speed. But load. The more the motor is torqued up the more likely it is to happen.
i suppose I could aim a GoPro at the engine mount sand drive around and see.
Shane
No it doesn't do it in park. only under load. And again it's not related to rpm or engine speed. But load. The more the motor is torqued up the more likely it is to happen.
i suppose I could aim a GoPro at the engine mount sand drive around and see.
Shane
Laughing Gas
Joined: Jan 2012
Posts: 887
Likes: 70
From: Santa Clarita
As others have pointed out, worn motor mounts can contribute to this type of behavior. Check your fan to make sure it's not hitting a hose clamp or a radiator tank under acceleration. Sometimes when a hose clamp is turned just right and the fan gets enough flex you can end up hearing the two of them making a connection under load.
Tuned
Joined: Oct 2010
Posts: 357
Likes: 11
From: Roanoke, VA
Here's a video of the noise. It doesn't seem
to be fast enough to be the fan to me. But the exhaust or motor mount is a real possibility.
https://m.youtube.com/watch?v=qWT9eR3cCtA
to be fast enough to be the fan to me. But the exhaust or motor mount is a real possibility.
https://m.youtube.com/watch?v=qWT9eR3cCtA