tired old plugs & PCV valve after 113k mi
Change the spark plugs and PCV valve in your Prius every 110k miles. Denso iridium plugs are recommended.
Some tips:
Remove the 10mm bolts holding the relay box, place a towel underneath and lay the box on top of the inverter hood
Loosen all the 10mm bolts on wiring harness also need to remove the air filter top two bolts and the harness bolt that threads into the top of the engine block behind the air filter box
Tape on your spark plug socket (with rubber insert) to your extension socket - if it falls off, you will not be happy.
You can use a 5" straight extension or a 4" and a universal joint end
Make sure to use anti seize on your spark plugs to ease removal next time
You will need to lift up the wiring harness in order to get to the right most coil
Be gentle with the coil wires and don’t over tighten the spark plugs
Use tape over the coil holes to prevent debris from falling in while you are working on the PCV valve
Some tips:
Remove the 10mm bolts holding the relay box, place a towel underneath and lay the box on top of the inverter hood
Loosen all the 10mm bolts on wiring harness also need to remove the air filter top two bolts and the harness bolt that threads into the top of the engine block behind the air filter box
Tape on your spark plug socket (with rubber insert) to your extension socket - if it falls off, you will not be happy.
You can use a 5" straight extension or a 4" and a universal joint end
Make sure to use anti seize on your spark plugs to ease removal next time
You will need to lift up the wiring harness in order to get to the right most coil
Be gentle with the coil wires and don’t over tighten the spark plugs
Use tape over the coil holes to prevent debris from falling in while you are working on the PCV valve
After the new spark plugs are in, you will need to wrestle the wiring harness up and towards the front of the vehicle
You will need a six point 19mm medium length socket along with a small headed socket (I used a 1/2" breaker bar)
Note: there is alternate way to get at the pcv valve, but involves removing the entire wiper and wiper housing assembly.
Use caution when screwing / unscrewing the bolt holding the wiring harness towards the front of the engine to the block - as it is easy to drop the screw/open ended 10mm wrench. You may want to have an extension magnet handy if you do drop a tool.
Once complete, you can now put the coils back then reverse the process and put everything else back. Do not over tighten the 10mm bolts, a bit over snug is fine - use a torque wrench if you wish.
Doing this job will take you 1-2 hours max with these instructions - good luck.
You will need a six point 19mm medium length socket along with a small headed socket (I used a 1/2" breaker bar)
Note: there is alternate way to get at the pcv valve, but involves removing the entire wiper and wiper housing assembly.
Use caution when screwing / unscrewing the bolt holding the wiring harness towards the front of the engine to the block - as it is easy to drop the screw/open ended 10mm wrench. You may want to have an extension magnet handy if you do drop a tool.
Once complete, you can now put the coils back then reverse the process and put everything else back. Do not over tighten the 10mm bolts, a bit over snug is fine - use a torque wrench if you wish.
Doing this job will take you 1-2 hours max with these instructions - good luck.
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