missfiring and burning rich - Toyota Nation Forum : Toyota Car and Truck Forums

so_newman · 10-01-2006, 07:50 PM

My 2000 echo is running rich. I also have a misfire over all four cylinders, although not bad enough to set the code. I have set the code twice for missfire in cylinder one.

I have tested the coil on cylinder one and that's not my problem. I have changed my MAFs and that didn't work. I've changed all my spark plugs and that didn't work. I've used injector cleaner and that didn't work.

Has anyone had any experience with something like this?

echo987 · 11-26-2007, 05:59 PM

probably your O2 sensor. your o2 sensor and Mass air flow sensor control your air/fuel mixture. My 2000 echo wouldn't run until I changed the O2 sensor and MAF Sensor. Mine needed both.