Toyota coil pack rust/corrosion

[Jarpin]

Hey guys, changing the plug wires on my 1999 Toyota 1MZ-FE. I took off the connectors on the front cylinder bank and I saw this on the coils. Do I need to replace them or can I just dremel off the rust and corrosion? The car actually starts and runs fine, believe it or not...

 

[oggb]

If the contacts clean up ok and the coils work fine I'd probably just keep on using them.

 

[AutoMechanic]

I’m guessing since you are doing wires this one doesn’t have the coil on plug so if this is down in the coil I say definitely replace it. I’ve never seen one look like that I’d be worried. I’m having trouble picturing exactly what you are saying.

 

[JMJNet]

Drive after cleaning them and see how it goes?
If it does not feel right, then replace them.

 

[clinebarger]

I’m guessing since you are doing wires this one doesn’t have the coil on plug so if this is down in the coil I say definitely replace it. I’ve never seen one look like that I’d be worried. I’m having trouble picturing exactly what you are saying.

It's a Waste Spark System, The 3 front cylinders have coil packs over the plugs then plug wires going to the 3 rear cylinders. One of the Towers for a rear cylinder plug wire is rusty/corroded.

 

[AutoMechanic]

It's a Waste Spark System, The 3 front cylinders have coil packs over the plugs then plug wires going to the 3 rear cylinders. One of the Towers for a rear cylinder plug wire is rusty/corroded.

Oh ok that makes more sense now. I haven’t ever worked on one of these particular cars.

 

[clinebarger]

Lucky you! Early 1MZ-FE's can be a pain, Especially in a Sienna.