Is this lifter tick, piston slap, or something else?
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Its lifter noise, when the engine is shut off the lifters and oil gallery drain down so when you start cold the lifter get a shot of air and they clatter until the oil warms up. Its possible you have a leaky oring at the oil pump, this can let the lower oil gallery bleed down and cause a lot of noise at every cold start.
Piston noise or piston slap sounds EXACTLY like a diesel engine running. Most dealers will say lifter noise is piston slap, I'm not sure why???? I think because piston slap is acceptable according to GM but lifter noise is not SO if its diagnoses as piston slap its ok?????
If your engine made that much noise from loose fitting pistons it wouldn't be running very well and be smoking oil out the exhaust so don't let anyone BS you.
Piston noise or piston slap sounds EXACTLY like a diesel engine running. Most dealers will say lifter noise is piston slap, I'm not sure why???? I think because piston slap is acceptable according to GM but lifter noise is not SO if its diagnoses as piston slap its ok?????
If your engine made that much noise from loose fitting pistons it wouldn't be running very well and be smoking oil out the exhaust so don't let anyone BS you.
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Oh, another thing of mention is that we went around and unplugged each of the coils while it was running and did tye same little rev for each of them. The noise persisted with each coil disconnected. Our thoughts were that if it was slap, when we un plugged the offending cylinder, the noise would stop. But it never did.
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I have a tick that sounds the same as that which I've been trying to figure out if it's piston slap or lifter. I'm gonna try to shoot a video of it, but the characteristics I've been able to determine so far is that it first appeared after a mechanic revved the engine aggressively in neutral (close to 5k RPM) many times, and that it's most notable in cold winter starts with it still being fully audible at hot OT but at low RPM.
Does anyone have a video link of an actual piston slap for comparison sake?
Does anyone have a video link of an actual piston slap for comparison sake?
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