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Old 06-18-2017, 09:11 PM   #1 (permalink)
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Default Tin-like rattling under car

My 2004 XL7 has a horrible rattling underneath, loudest when cold started and eventually warms and disappears. When driving it sounds bad, like a thin tin pan or big washer nut rattling around a pipe at low RPMs (1800-2200K) at around 25-30 mph, then with acceleration it's gone. 2 separate mechanics checked the catalytic conv, exhaust, heat shields and all connections and nothing, they have given up. It's not coming from the engine like so many others. I believe the Zuks are infamous for noises but "holy mystery batman"? Help!!!!
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Old 06-18-2017, 10:30 PM   #2 (permalink)
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These models are known for timing chain noise. Tensioners and guides die prematurely. I had to replace mine at 175k. The guides had disintegrated. Currently, I have a weak hydraulic in the head now that taps at start and the under load.

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Old 06-19-2017, 07:41 AM   #3 (permalink)
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What you are hearing is the cat converter heat shield that has broken its weld and has fell onto the converter and rattling. Very common. Either reweld or remove it
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Old 06-19-2017, 07:30 PM   #4 (permalink)
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Yes I read much about that issue, noise doesn't seem to be coming from that area.
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Old 06-19-2017, 07:31 PM   #5 (permalink)
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Thats what seems like the area of the noise, I will check the cat heat shield again now...
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Old 06-19-2017, 07:37 PM   #6 (permalink)
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Banging the heck out it everywhere on the cat and around. No noise from there.
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Old 06-20-2017, 09:00 AM   #7 (permalink)
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i have seen those little brackets that bolt from the transmission to the exhaust manifold to break or crack even seen them missing. this will cause a bad rattle.
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Old 06-20-2017, 12:22 PM   #8 (permalink)
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Quote:
Originally Posted by don_markos View Post
Banging the heck out it everywhere on the cat and around. No noise from there.
Banging it with your hand may not cause a rattle. Get it up on a lift and inspect the shields
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Old 06-21-2017, 03:58 PM   #9 (permalink)
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MDC i think thats it, there is a nut missing up under the bracket. Will report ASAP...

LX7 Limited- would never use my hands, both I and Mech have worked out the cat and shields to no avail. ty
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