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    97 explorer engine knock cold starts

    I have a 1997 Ford Explorer with a 4 litre OHV, not the SOHC engine. After approx. 12,000 kms, the engine has developed a noticeable knocking sound on cold starts or when the engine has been shut off anytime over 5-6 hours. This noise lasts for approx 7 seconds, then disappears. Once the engine...
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