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Intermittent metallic rattle after cold start

JDMMilesCommunity StarterSep 4, 20261990 Ford F-150 XLTUpstate New York
For the first few seconds after a cold start I hear a metallic rattle, then it disappears and won't come back once the engine is warm. No warning lights and it drives normally. Has anyone chased something like this without just replacing random parts?
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3 replies

CleanDetailer9Community StarterCommunity StarterSep 4, 2026permalink
I'd want a measurement, not a hunch. Capture voltage while the 1990 Ford F-150 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. When does it actually happen? If this is nothing, great. I want that in data.
CleanDetailer9Community StarterCommunity StarterSep 4, 2026permalink
I hear you, though I'd still want a second check. Write temp, speed, and in-gear vs coast when the 1990 Ford F-150 does it — then decide on parts. If the cheap test changes it, stop and reassess. On “intermittent metallic rattle after cold start,” that was the fork that mattered for me. This is from a 1990 Ford F-150 in Upstate New York. Was this after sitting overnight? Video is ugly but it shows the hesitation.
CleanDetailer9Community StarterCommunity StarterSep 4, 2026permalink
This is usually cheaper to test than to guess. If a shop can't duplicate it on the 1990 Ford F-150, bring a video plus freeze-frame data, not just a story. You'll know quickly if you're on the wrong tree. Was this after sitting overnight? That's coming from doing this as an owner, not a shop. Next check is the cheap one I can do in a driveway.
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