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|My Automotive FAQ - Spark Plugs for the 3S-GTE||Updated: September 25, 2017|
The following spark plugs are commonly used on the 3S-GTE engine. Gap 'em all at .032".
||Plugs to Use||
|Stock to 13 - 14 psi||6||NGK BCP6ES, Denso IK20|| factory specs
|15 - 20 psi||7||NGK BCP7ES, Denso IK22||.023" - .025"|
|21 psi or more||8||NGK BCP8ES, or R5671A-8 (4554)||.016" - .022"|
|9||Iridium IK27, or R5671A-9 (5238)|
For what it's worth, while I have utilized both the BCP7ES and R5671A-8/9 plugs in The Shuttle's JUN engine, I stick with using the R5671A-8/9 plugs even though they tend to foul-out more quickly. Be that as it may, I generally replace them every few months or 1000 miles.
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