Quote:
Originally Posted by firebirdguy
its a V6, no timing belt.
coils usually either work or they dont. the coils didn't increase your MPG, the new plugs did... & your old plugs must have been in horrible condition or partially fouled if you think the mpg increased 2mpg from changing plugs.
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You're right, coils USUALLY work or dont work. But overtime they loose their efficiency. Coils produce thousands of volts and a lot of heat. With 250k miles on the original coils and the heat from engine will degrade the coils. Ive owned my 4Runner almost 16 year's now and I change my plugs every 30k miles, so it wasn't the plugs. With new plugs and original coils I was getting 16 mpg. With new coils and plugs, I'm getting 18 mpg, both driving at 65 mph. The numbers don't lie.
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2003 V6 BLACK SR5 4X4-Runner
OB #1334
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