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Spark plug wire differences... *thin vs thick*

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Old 07-29-2011, 05:13 PM   #1
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Spark plug wire differences... *thin vs thick*

My 1992 4-runner has these 5mm skinny-ass spark plug wires, yet my buddys engine (1991) has big thick ass wires. The cap and rotors are also different...

anyone know why toyota changed to a design not as good? the thin wires are also 2-3times more costly than the thicker wires. I ordered up a cap/rotor/wires for the older style engine and i am going to swap my coil pack to the older style. Does anyone see a issue with this?
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Old 07-31-2011, 10:32 AM   #2
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They probably changed the insulator material to have higher electrical insulating properties, but made the overall insulation thinner the shed heat better...heat increases resistance, which is no good for plug wires or coils as it cause them to breakdown faster....just my thought on why they changed to a "thinner" wire.
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Old 08-26-2011, 10:57 PM   #3
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Good Post!


I was wondering the same thing... I was at Pick-N-Pull and saw the thick plug wires (mine are skinny) and was wondering whether to replace mine.

Now I think I'll keep the skinny ones on my truck and use the thick ones as a spare.....

'92 Runner SR5 3.0 (mfg 11/91) bought 4/07 in Portland, OR
fire engine red
112,000 original miles as of 10/2009
The BEST mod was garaging it in California, rather than Michigan.

Mods: Deckplate mod; Downey 1.5" rear lift with spacers, new springs & shocks; 750W inverter with power strip; ProLock anti-theft, Pioneer deck w/tweeters, rear door speakers, rear 12"s; Hilux Altimeter/tilt gauge (wired into the climate control light); Magnaflow exhaust; Garmin GPS; Thule roof basket w/Hella lights.
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Old 08-27-2011, 04:45 AM   #4
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My bet is you were looking at aftermarket stuff.
Use OEM.

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