Eugenio,77
mail@toyota-club.net
© Toyota-Club.Net
Mar 2017 - Nov 2019

General remarks

• Normal replacement interval for plugs: 30-40.000 km for "nickel", ~80.000 km for "platinum", 60-120.000 km for "iridium" of different designs. The real lifetime of plugs is limited by the quality of local gasoline and the technical condition of a particular engine.

• No the real need existed to use "platinum" spark plugs in classic engines of 1990s (except for certain models with excessively difficult access).
• At the same time, it is welcomed in every way to use "iridium" spark plugs where it is possible and economically feasible.

• Do not confuse the plugs with usual and long threaded part. Do not confuse traditional spark plugs and "thin" spark plugs with a smaller thread and a hexagon size.

• High-tension leads or ignition coil tips also require periodical check and replacement.
• Do not confuse the normal corona stain trace with a soot traces of gases breakthrough.

• DENSO. Spark plugs types for 1990s - 2010s models
• DENSO. Spark plugs marking
• DENSO. Catalog for Japanese domestic market models 1996-2019
• NGK. Catalog for Japanese domestic market models 1970-2004
• DENSO. Catalog for overseas market models pre 2014

DENSO Spark plug types for 1990s - 2010s models

K16R-U11, K16PR-U11 Nickel. Classic spark plugs (ISO) Thread M14 Thread length 19 Hex 16

Q16R-U11, Q16PR-U11 Nickel. Classic spark plugs (JIS, 2.5 mm longer than K type) Thread M14 Thread length 19 Hex 16

K20HR-U11, K16HPR-U11 Nickel. Classic spark plugs with Long Reach thread. Thread M14 Thread length 26.5 Hex 16

PK20R11 Platinum. Spark plugs with platinum coating at central and ground electrodes. Thread M14 Thread length 19 Hex 16

PK20TR11, PK20PTR-S9 Platinum. Spark plugs with platinum coating at central and two ground electrodes. Thread M14 Thread length 19 Hex 16

SK20R11, SK16R-P11, SK20PR-A11 Iridium. Spark plugs with 0.7 mm iridium central electrode. Thread M14 Thread length 19 Hex 16

SK16HR11, SK20HPR-L11 Iridium. Spark plugs with 0.7 mm iridium central electrode, with Long Reach thread. Thread M14 Thread length 26.5 Hex 16

SK20BR11 Iridium. Spark plugs with iridium central electrode, with additional ground electrodes. Thread M14 Thread length 19 Hex 16

FK20HR11 Iridium. Spark plugs with 0.55 mm iridium central electrode, with 0.7 mm platinum coated tip on ground electrode, with Long Reach thread. Thread M14 Thread length 26.5 Hex 16

SC20HR11 Iridium. "Thin" spark plugs (reduced thread diameter, reduced hex size), with 0.7 mm iridium central electrode, with a platinum coated pad on the ground electrode, with Long Reach thread. Thread M12 Thread length 26.5 Hex 14

FXE20HE11, FC22HR9 Iridium. "Thin" spark plugs (reduced thread diameter, reduced hex size), with 0.55 mm iridium central electrode, with 0.7 mm platinum coated tip on ground electrode, with Long Reach thread. Thread M12 Thread length 26.5 Hex 14

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