Originally posted by: brblx
hence the term 'cylinder cutout test'...
rad- is the noise any different based on engine temp?
Noise is sometimes not there when engine is cold. NEVER makes the noise at idle, and ONLY above 1500rpm. It sounds to both myself and my dad that it's coming from the top end at the front of the motor. Car is a 91 Stealth ES DOHC V6.
It also runs pretty badly and doesn't seem to have much power, especially in first (ATX). I need to get an analog voltmeter to read the codes.
Edit: The noise definitely speeds up with engine speed. My dad thinks the valves are floating due to the timing being messed up.
Edit 2: A guy on a Stealth/3KGT forum says the noise is the piston slapping the bottom of the head, because it spun a rod bearing. But then, he also said you don't hear rod knock at idle. If it spun a rod bearing, what kind of oil pressure would I be seeing?