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Strange engine clatter...

when my engine is at low rpms and high load, and i don't give it a lot of gas but try to accelerate deliberately, i get this clatter from my engine. i'm curious to what this may be, it seems to go away at higher rpms, or if i push the gas down harder.
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Old 10-10-2003, 11:25 PM
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The cam pulley has been know to come loose.
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Old 10-10-2003, 11:40 PM
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Is it in the engine compartment, or maybe your CAT is rattling around. CAT and exhaust shields like to make noise at low RPM's.
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Old 10-11-2003, 06:51 AM
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Since we are pulling at straws............. clatter = what ?

I will say rod bearings............
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Old 10-11-2003, 07:32 AM
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low octane fuel..engine knock/valve chatter.. add octane booster or premium quality fuel
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Old 10-11-2003, 09:56 AM
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I just diagnosed my clatter problem.
Sounded just like yours.
After EXTENSIVE research here on Pelican I was sure I had a lifter stuck/knocking whatever. But, I kept thinking the sound was like a loose/wobbly pulley. Checked behind timing covers, everything nice and tight. No leaks or loss of power. Just very intermittent "rattling" only at low/idle rpm's. Then I remembered my trusty mechanics stethoscope. Found out the waterpump vane impeller was worn where it meets the shaft yet the belts kept it tight enough not to "feel" a worn pulley. Strange though, I never developed the telltale waterpump worn out leak.
Hope this helps.
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Old 10-11-2003, 02:24 PM
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it's not knock, it's a weird metal clattering sound, it's actually very hard to describe. but what i said about it ONLY happening at low rpms, high load (too high of a gear), and not a lot of gas from the pedal.
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Old 10-12-2003, 11:34 AM
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