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Old 06-27-2010, 10:16 AM
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HoustonHemi HoustonHemi is offline
Dodge Ram Forum Senior Member!
Join Date: Jan 2010
Location: Texas!
Age: 49
Posts: 716
Gender: Male
Vehicle: 09 Ram 1500 Reg Cab SB
Trim Level: SLT w/5.7 and 3.92
Color: Black
Engine: 2009-2010 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 5
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Originally Posted by 2010BHDodge View Post
I've seen two other 09 hemis do this. A dealer told me it was "piston slap" on startup but that doesn't sound right. I would suspect more to do with lubrication - either the light oil or if there is the check valve problem as mentioned in earlier posts.
I had what I thought was piston slap on a Silverado once... BUT, I was able to fix it,,,

Long story short, a knock sensor (and the wiring to the sensor) under the intake manifold was going out, and it pulled the timing out of kelter,,,

The knock would go away a few seconds after start up.

It knocked (occaisionaly) for months,,, Finally, the sensor 'died' and activated the MIL.

Read code, replaced sensor, knock gone.
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