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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".
| Boost Level |
|
Plugs to Use |
Suggested Plugs Gap |
| Stock to 13 - 14 psi | 6 | NGK BCP6ES, Denso IK20 | factory specs .032". |
| 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) | ||
| 10 | Champion C57C |
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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