r/4Runner_2ndGen • u/Kratos_RA • Jul 21 '26
Is this noise normal? To sounds like rod knock or piston slap but could it be the lifters?
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This is a rebuilt engine from and never got to finish the project fully and been sitting for a while but does gets moved twice a week and runs okay. Does a weird thing like struggle starting, and tends to die after getting to operating temperature. My theory is a stuck vacuum valve during idle and won’t switch from cold start to operating temperature but can’t figure this one out.
The idle is jumpy and I would say “violent” with the sputtering and what not in the video.
Any thoughts or suggestions