Engine Coil Pack Bad?

[Okralord]

When accelerating in order to enter a highway via onramp or otherwise entering high-speed traffic, I hear a rattling or clicking sound. I've had this problem before and have replaced the battery, spark plugs, battery connectors+cables, and spark plug cables.

Is replacing the coil pack the next logical step?

-Okralord

 

[Mustang5L5]

Are you talking about detonation?

If the coil pack was bad...you'd have misfire codes. Do you have a check engine light?


The rattle or clicking can also be serpentine belt related as well. Hard to diagnose sounds over the net though

 

[5.0 Ford Guy]

It could be lifters tapping, spark knock, or any number of things. From what you are saying my guess would be spark knock. Have you checked the timing? When you replaced the plugs did you replace the cap and rotor as well? I haven't checked the timing on my wife's '01, but it does the same thing. It is spark knock on my wife's car. It looks to have a new coil pack on it. So after spark plugs, cap, and rotor I plan to set the timing and go from there. Let me know if you figure anything out and I will do the same.