Please help me identify this knocking sound! - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 11-11-2013 Thread Starter
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Please help me identify this knocking sound!

This is my 2000 GT, 36,250 miles on it and it has been making this metallic knocking sound for a while now, id say the last 6 months. It only starts once the engine is fully warmed up... when the car is cold it does not make this sound.

I had it compression tested and its all good 185+ psi on all 8, no weird misfire, runs good, no oil consumption etc. You can only really hear the noise at idle.. it seems to go away after 1200rpm.

You can hear the noise the best on the second half of the video once i move the camera into the front wheel well. Anybody heard this noise or know what it is?

2000 Mustang GT Mystery Knock - YouTube

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post #2 of 7 (permalink) Old 11-11-2013
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do you have longtubes? my longtubes knock on my K member at idle and make a ticking noise.


[COLOR="Black"][B]2004[/B][/COLOR] [COLOR="Red"]Torch red[/COLOR] [COLOR="Red"]mach 1[/COLOR] Cams, mac long tubes, lethal offroad X, magnaflow IRS exhaust, strange front coil overs, strange 14" 175lb springs, 4.30's, FRPP 31 spline differential, Moser 31 spline axles, steeda tri-ax, exedy 2 clutch, FRPP throw out, FRPP pilot bearing, MM clutch goodies, K&N poly intake, SCT tuned

[B][COLOR="black"]1996[/COLOR][/B][COLOR="DarkRed"] Lazer red GT[/COLOR], 2002 Pi swapped, stage 1 cams, shift kit, ram air intake, UPR offroad X, flowmaster dumps, 125 wet shot...
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post #3 of 7 (permalink) Old 11-12-2013
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What you are describing sounds like a noisy lifter but the noise is actually kind of pingy or tinny. Any exhaust or intake leaks?
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post #4 of 7 (permalink) Old 11-12-2013 Thread Starter
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I haven't had a chance to check for vacuum and exhaust leaks. I have stock headers and nothing is making any contact. I have never heard an exhaust leak sound like this before, but I guess its a possibility. If it is a leak it's probably the header with my luck lol.
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post #5 of 7 (permalink) Old 11-13-2013
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Get an automotive stethescope (seen them at Harbor Freight for $5) and start poking around. I agree with the above, could be an exhaust leak since you hear it better by the front wheel, but it could also be resonating from somewhere else. Check the valve covers and engine front cover in particular. A common place for an exhaust leak is where the manifold mates up to the midpipe on the passenger side.


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/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #6 of 7 (permalink) Old 11-13-2013 Thread Starter
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I will have to do that... weird thing is when you stick your head under the hood all you can hear is the injectors and the belt.. not that annoying knock. its standing beside the car or sitting in it when you hear it.
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post #7 of 7 (permalink) Old 11-17-2013 Thread Starter
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UPDATE:

I changed the oil today and when pouring the waste oil into a container i noticed quite a bit of metal at the bottom of the drain pan...
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