Spark Plug Time?

Typically, what would one notice when spark plugs are required? I'm at 68K and I assume lower MPG's at the least. I'm still at my typical average for MPG. Due to a back injury, I'm no longer able to do this type of work so I'm going to have to pay for it and I don't want to pay too soon if I don't have to.
TIA

 

I am getting ready to change mine at 100650 miles on my 2016 Off Road. It runs as good as it did new and no notice of any issues

 

I hope that's an old picture. If not and that's the weather in August then

 

With modern computer managed ignition systems, spark plugs tend to last a really long time! I've seen plugs with over 100k miles on them come out looking damn near new. I'm not saying you shouldn't swap them out, but don't expect any miracle improvements here!

 

I changed my plugs at 51K miles. No change in MPG for me but it does seem to have more zip during acceleration. Driver side is tough to get at with or without a back injury. My plugs looked like the picture in post #284 on this thread.

https://www.tacomaworld.com/threads/3rd-gen-tacoma-spark-plug-replacement.554468/page-15

Whoever changes your plugs, everybody seems to recommend staying with Denso plugs.

 

I replaced mine around 80-85k; they looked brand new. I never had any drop in mpg or performance as far as I could tell, so if you're stressing for time or urgency, I wouldn't think too much of it. Obviously do it whenever you can, but its not worth the urgency of paying an outrageous amount for someone else to do it, even if that means 30k more miles (in my dumb opinion).

 

If you wait too long they might not come out. I did mine at 80,000 and 165,000 and a couple were stuck enough to make me pretty nervous, but did not break luckily. Electrodes were not bad though.

 

Symptoms are usually things like rough idle and misfires. Not sure how to objectively determine mpg changes. Toyota recommends 60k. I get he upfront cost but its something typically only done 1-3 times during typical ownership

 

Been there and it sucks!

 

The Owners Manual says 60K spark plug change interval.

 

spark plugs, coolant, ATF are the 3 things I don't wanna work on myself, so because coolant needs 50k mile change, I'll just bundle the 3 services together and have them done every 50k miles just easier to keep track

 

I think the Owners Manual says 100K for the first coolant change and then every 50K after.

 

I've done that before with my previous Toyota running the pink stuff, maybe it was just anecdotal or bad luck, but the water pump bearing got chewed up and started leaking right around 90k. I was told the factory-filled coolant degradation was the culprit and I should have it changed in the first 50k miles so the additives could still protect the water pump.

 

Was your engine cold? On Aluminum heads I like the engine to be stone cold before pulling the plugs out.

 

I believe my engine was cold both times but that is good info. Thanks.

 

60k-70k is a good time. Don’t wait til 100k

 

Bought my used at 69k mile, changed spark plug at 100k. It was just black. I’d change it early.

 

I find it strange how many hold the manual specified as gospel for oil changes but don’t apply the same attention to the plug interval.

 

I replaced plugs in my 2017 at 80k. Could have waited till 100k, easy. Lost the pictures.

Iridium at 60k is a waste.

 

Heard all the rumors and geared up for the big day. I won't say it was simple but it wasn't anything like a Cadillac back in the 80's.