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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Anyone recognize this noise?

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Old Dec 14, 2023 | 07:21 PM
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1990f250engine's Avatar
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Anyone recognize this noise?
1990 460 5spd. Can't hear anything from the engine bay. Just underneath truck. Kinda sounds like transmission? Only does it under light load like cruising on the highway.
solved: spark knock

 
Last edited by 1990f250engine; Dec 15, 2023 at 06:50 PM. Reason: solved
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Old Dec 15, 2023 | 10:41 AM
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sounds like the trans.
 
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Old Dec 15, 2023 | 10:49 AM
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Sounds exhaust related to me. Does it have a catalytic converter? My converter makes a similar noise occasionally.
 
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Old Dec 15, 2023 | 12:47 PM
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My cat does too. Usually can't hear it once it's moving but you can at idle for me.
 
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Old Dec 15, 2023 | 04:51 PM
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Go underneath your truck with a dead-blow hammer or a rubber mallet and start tapping on parts til you find the one rattling. It doesn't sound like transmission. Sounds like exhaust or sheet metal like a skid plate or heat shield.
 
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Old Dec 15, 2023 | 06:44 PM
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it was spark knock.
 
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