5.7 Hemi engine rpm's varying at idle

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shanede54

Junior Member
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Jan 7, 2015
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Ram Year
2004
Engine
Hemi 5.7
98k rod knock so i replaced the engine with a wrecking yard 80k. After install the rpm's wobble or increase and decrease...Pushing the pedal to full throttle I only get about 3500 rpm...I know I need to check codes but any other advice would be greatly apprreciated...
 
Harley Harrold

Harley Harrold

USAF Ret. 36+ years service
Military
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Mississippi
Ram Year
2007
Engine
5.7L HEMI
There is a RPM limiter, set in the programing, to prevent over reving the engine in park, or neutral, to prevent engine damage. It is set around 3,500 RPM, so the engine should not exceed that RPM.
 
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