Another Prius 100k Maintenance Question

1. 3 US gallons of Toyota Super Long Life Coolant
2. 4 US quarts of Toyota ATF WS
3. 4 Denso iridium spark plugs, SK16R11
4. This is the same as #2.
5. Yes, you should purchase the front pads and rear shoes.

A regular mechanic who is not trained on Toyota hybrids should not be trusted to do 1 and 5 correctly.

 

If you are placing a big order, maybe you might also order a few:

- Engine air filters
- Engine oil filters
- Cabin air filters
- one PCV valve
- one engine coolant thermostat
- one serpentine drive belt
- Windshield wiper refills (or blades if you don't want to install refills)

 

plug wires while at it would not hurt and keep the shipping charges combined

 

The Prius spark igniters sit directly on top of the spark plugs so there are no high voltage spark plug wires.

 

Thanks Patrick, as you can tell I have not changed my plugs yet lol
I learn something new again thank you, very good info here.
Is there a video of replacing the plugs on 2nd gen prius, or is it very self explanatory ?

 

I am not aware of a video. First, remove the two bolts holding the relay box mounted on the cowl above the engine and set the relay box aside, for access to the four spark igniters.

To remove each igniter, it is necessary to remove the wiring harness connector, then remove one bolt which holds the igniter to the engine valve cover. Note that the connector has a latch that must be lifted up gently to unlock the connector.

After each igniter is removed, inspect it for corrosion on the electrical terminals and cracking or burn marks on the plastic body. Replace the igniter if you see flaws on the plastic body as this can cause high voltage leaks.

I moisten a clean paper towel with paint thinner, and use that to clean off the dirt/dust accumulated on top of the igniters.

Then remove the spark plug which is located at the bottom of the spark plug well. If you see rust on the metal hex shell and porcelain insulator of the spark plug, that is an indication that water has seeped down into the spark plug well. Most likely this is because the center seam of the cowl is leaking water which drips onto the valve cover. That needs to be corrected to prevent ignition misfire.

Replace the plugs with the correct NGK or Denso iridium spark plug as indicated in the owner's manual.

Tightening torques:

spark plugs: 13 ft.-lb.
igniter bolts: 82 in.-lb.
relay box bolts: 74 in.-lb

 

Thanks, I am sure others might be able to use this info too.