Rattling Noise

[JPaul]

Mine does the same thing, I'm sure it's just the engine mounts being cold are stiffer and transmit more vibrations to the frame and probably also affect the harmonics being transmitted to the exhaust system. In other words when it's cold it shakes everything differently, causing stuff (probably the heat shields still) to rattle when normally (when everything is heated up that is) it wouldn't.

The colder it gets the worse the rattles are at first until everything warms up. It's also possible that it's just stuff is loose when it's colder and rattles, as it heats up it tightens back up and stops rattling.

At any rate, I figure if I poked around while it was 10 degrees out I could find all of these loose parts and tighten them up, but then I might run the risk of having them break once they've warmed up to operating temperature.

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[alrock]

Higher mileage engines also have a bit of slack in the timing chain which leads to a rattle that disappears quickly.

 

[Clark]

Oh man!!! I just hit 100k. But thats the only problem I have.

 

[4speedfunk]

Piston slap is a chevy tradition...for the past 50 years. It's probably enhanced by the goofy 5-cylinder layout of the H3. These motors are inherently out-of-balance and they use an internal balance shaft to keep them from vibrating apart. The balance shaft is nothing more than a hunk of steel with heavy counterweights that rotates much like a camshaft. It is "timed" to cancel the pulses of the odd-firing crankshaft. Without the balance shaft the motor would shake so hard that it would be un-driveable. It would probably grenade itself at 2000 rpm.


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[Odimus]

Do you mean driveshaft CVs or axle CVs?

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Axle cv's

 

[Odimus]

Well it's been sitting since October...just took it to a mechanic this week and the noise was an expensive one...front differential...should get it back next week...