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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 02-13-2011, 05:17 PM
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Default 4.7 engine knock

hi i have a 2005 dodge ram with a 4.7 motor and i have a slight knock at idle but it stops after i give it gas what could this be
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Old 02-13-2011, 05:46 PM
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Rod bearing, main bearing, loose piston, bad wrist pin, something in the valvetrain, or something in the timing chains.
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Old 02-13-2011, 05:55 PM
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it is very slight thought should i be worried
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Old 02-13-2011, 05:59 PM
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Any type of knock short of a little piston slap on an extremely cold startup is cause for concern.
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Old 02-13-2011, 06:23 PM
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would this be covered under the 7 year 70000 mile warranty
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Old 02-13-2011, 06:28 PM
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If it's an internal failure, it should be covered.
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Old 02-13-2011, 06:29 PM
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is it common for piston slap on these motors because the motor uses no oil and has excellent power and gets good gas mileage
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Old 02-13-2011, 06:30 PM
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i wish you could give me an example of piston slap or a video to hear it
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Old 02-13-2011, 06:32 PM
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My 3.7 does it when it's below freezing outside and it's sat overnight. It's very faint and goes away when the engine warms up.
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Old 02-13-2011, 06:35 PM
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it didnt do this in the summer time and i also switched oil to like the walmart brand could this make a difference
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