When to change spark plugs

I have a 2021 Tacoma I just got. Just turned over 45k miles. I’m wondering when are you suppose to replace spark plugs?

 

I'll change mine around 100K

 

I changed my plugs at 50K miles. I could have waited longer, but I always lean toward doing maintenance sooner than later.

https://www.tacomaworld.com/threads/3rd-gen-maintenance-maps-get-300k-miles.789809/

 

Manual calls for them at 60k if I recall. I did mine around 65k. One of mine (and many others on here) was loose. It's a relatively easy job to do yourself, dealers charge nearly $1k to do it.

 

70k, but they could have gone to 100. Hell, I ran regular plugs in other cars past 100.

 

^^ This ^^

 

I changed mine at 45,000 but only because of all the reports of loose plugs. Glad I did because I had a few loose ones.

 

i suggest 60K miles or thereabouts for the first change. if they look good, i wouldn't have an issue going 100K on the next go around.

 

Manual states 60k miles. It’s under $100 to but them and pretty easy to replace them. Do it when you hit 60k.

 

Did mine at 60K. Found one loose from the factory.

 

I am at 68K and will wait until ~100K per the dude at the Toyota parts desk. Manual says 70K. A couple plugs are hard to access as I recall.

 

This has been posted to help:
https://www.tacomaworld.com/threads/spark-plug-replacement.811507/

Also recommended you get a 24 in extension for the socket wrench because of how deeply buried driver-side plugs are.

 

Changed mine at 100k and they still looked good!!!

 

Toyota of Lompoc, CA wanted $700.00 to change the spark plugs.

 

The dude at the service desk said they were due to be replaced at 60K

 

Some have have changed until 120k. Others changed at 100k. If you want to change at 60k, go for it, but do it yourself and ask for help if you need. Stealerships have charged $700 to change $100 of spark plugs.

 

When you get a misfire

 

My understanding is old plugs may lead to a weaker spark, which in turn causes a less efficient burn, and thus reduced fuel economy. Even a 1 mpg difference over 30k extra miles will add up quick. Ive ran plugs past their mileage before, but its something to consider, plugs are cheap.

 

Ballpark it @ something over 200K then..

 

Most practical reason to keep secondary ignition components happy is to protect the converters. Converters don't like raw fuel. A spark related misfire will send liquid fuel straight into them like a rocket engine