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-   -   4.7 engine knock (

bam2880 02-13-2011 05:17 PM

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

RamTech 02-13-2011 05:46 PM

Rod bearing, main bearing, loose piston, bad wrist pin, something in the valvetrain, or something in the timing chains.

bam2880 02-13-2011 05:55 PM

it is very slight thought should i be worried

RamTech 02-13-2011 05:59 PM

Any type of knock short of a little piston slap on an extremely cold startup is cause for concern.

bam2880 02-13-2011 06:23 PM

would this be covered under the 7 year 70000 mile warranty

RamTech 02-13-2011 06:28 PM

If it's an internal failure, it should be covered.

bam2880 02-13-2011 06:29 PM

is it common for piston slap on these motors because the motor uses no oil and has excellent power and gets good gas mileage

bam2880 02-13-2011 06:30 PM

i wish you could give me an example of piston slap or a video to hear it

RamTech 02-13-2011 06:32 PM

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.

bam2880 02-13-2011 06:35 PM

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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