when should I change my spark plugs on a 2007 Corolla S?

Pat W · 22 Jan 2012, 09:09 am

My car has 55k miles and I've noticed the gas milage has dropped. I have changed out my filters and checked my tire pressure. I assume it's the spark plugs. I'm not sure if Toyota put the 50K spark plugs or the 100K.

George D · 22 Jan 2012, 09:25 am

I recommend changing out your plugs once every six months to a year, and your wires every one to two years. It improves my fuel consumption when i do it. Also, don't forget your oil changes; a small key to also keeping up good mileage.

C7S · 22 Jan 2012, 09:40 am

When you change spark plugs, you might as well do a complete tune up. New fuel filter. New spark plugs and spark plug wires. New distributor cap and rotor. Then you should get better gas mileage.

Your gas mileage also has to do with how much weight you have in the car. One extra passenger or a half full trunk makes as much as a 2mpg difference.

Also, driving at 65mph uses 15% more fuel than driving at 55mph.

bandit_60 · 22 Jan 2012, 09:54 am

pull 1 of the plugs out and see how they are burning. if they look good then clean them up and gauge them. if they are burnt then i would change them and the distributor cap and rotor.

Joe P · 22 Jan 2012, 10:09 am

Wow, lots of lame advice. The plugs should last at least 100k as should the rest of the so called tune up items. If you live in a cold climate, know that mileage drops in cold weather on all cars. Corollas have had some Engine Control Module issues including a recall on some of the 07s. Have a dealer check to see if your car is involved. They need to actually get a number off of the car to determine if yours is involved. Changing spark plugs, distributor caps and rotors frequently is a carryover to the buggy whip days. Many if not all modern cars have electronic ignitions and distributor caps and rotors are not present any more. I am pretty sure your Corolla has neither.