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jwelgan · 03-25-2008, 01:10 PM

I've been troubleshooting a decrease in fuel economy from 44mpg at 50,000 to 32mpg at 100,000, all highway. City driving has been effected as well, though not as clearly. Presently I'm looking at the ignition system and noticed the voltage to the coil packs is 1 volt under battery voltage which is 12.4v, and the sparks produced by them are orange-red, vs. "bright blue". Is this normal?

2004 Corolla LE. My wife's 2006 Corolla LE had the same color spark, with a 0.1 decrease in voltage. She only has 15,000 mileage and that battery is giving 12v even.

FYI - it'd take awhile to summarize what's been done to date re: fuel economy. Long and the short of it, the car's "fine" so this is just age. An engine flush (Amsoil) and putting a few ounces of Techron in the gas tank before each fill up has bought me 2-4mpg though. I have about 100,000 miles of logs. The things are finally coming in handy.

03-25-2008, 01:10 PM	#1 (permalink)
jwelgan EcoModding Lurker Join Date: Mar 2008 Location: Cumberland, RI Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Orange/red spark I've been troubleshooting a decrease in fuel economy from 44mpg at 50,000 to 32mpg at 100,000, all highway. City driving has been effected as well, though not as clearly. Presently I'm looking at the ignition system and noticed the voltage to the coil packs is 1 volt under battery voltage which is 12.4v, and the sparks produced by them are orange-red, vs. "bright blue". Is this normal? 2004 Corolla LE. My wife's 2006 Corolla LE had the same color spark, with a 0.1 decrease in voltage. She only has 15,000 mileage and that battery is giving 12v even. FYI - it'd take awhile to summarize what's been done to date re: fuel economy. Long and the short of it, the car's "fine" so this is just age. An engine flush (Amsoil) and putting a few ounces of Techron in the gas tank before each fill up has bought me 2-4mpg though. I have about 100,000 miles of logs. The things are finally coming in handy.