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2003 Dodge 4.7 knocks on cold start

Sent to Car Experts August 06 06:12 PM

2003 Dodge Ram Quad Cab 4x4 knocking When Cold. I just bought the truck used, so I do no how well it was maintained mechanically. It has 87,000 miles and it has a loud knock when I start it wben cold. After it warms up I can shut it down and restart 20-30 minutes later with no problem. Also, I live in Texas, so the air temp right now is 80-100 degrees. I am running mobil 1 with fram toughguard filter.

Customer (name blocked for privacy)
Status:  Closed   Value: $5
Answer
August 6 6:21 PM (8 minutes and 57 seconds later)
         
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If the knock has a high pitch it is probably a hydraulic lifter or wrist pin. If it has a base tone it is a crank bearing or rod bearing. If it goes away after a minute or so I would not worry too much. You can get a quart of Gunk or equivalent engine flush and new oil and filter and try that. If it is a lifter it might correct it.

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Firsthogman
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