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Old 02-27-2018, 12:38 PM   #19
yaris4062007
 
Drives: 07 BB yaris / 06 Mustang Gt
Join Date: Apr 2007
Location: northern california
Posts: 131
I am still running original timing chain, spark plugs @ 183k Miles
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Old 02-27-2018, 02:28 PM   #20
dogsridewith
 
Drives: 2007 2-door hatchback
Join Date: Jul 2016
Location: USAnotCA
Posts: 597
Spark plugs

my likely original Iridium spark plugs had spec gap at 135k miles. (They and the engine cover nuts released in sort of never touched since assembly way.)
One risk w/ old plugs is the porcelain cracking near the end of the center electrode...kills engine.
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Old 02-28-2018, 02:14 PM   #21
yaris4062007
 
Drives: 07 BB yaris / 06 Mustang Gt
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Location: northern california
Posts: 131
Good to know. What’s the gap on stock plugs.
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Old 03-07-2018, 05:33 PM   #22
esse10
 
Drives: 2009 yaris 2 door
Join Date: Feb 2013
Location: richmond TX.
Posts: 183
Timing chain on the 09 of course. And you should be good to go for 500k miles before even thinking of replacement. I believe the computer will compensate for any chain stretch to make a little difference, if any.
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