2000 expedition

[Neil Matlock]

So my truck has been running rough for the past week. Miss firing at idle and most speed, except when is below 30 degrees. If its 30 degrees or under, it runs well. Cel is a bad driver front O2 sensor. I also have an exhaust leak at the sensor. Maf indicates .01 lbs/s at idle and never gets above .17 lbs/s at any speed/rpm. I can take a screen shot from scan tool if need be, but Big bubba blue needs you help. Thanks for your time.

 

[macbox]

Did you check the codes? If is the O2 sensor, start with replacing that. The MAF sensor may need to be cleaned, there is a special spray made for cleaning them you can get at the parts store.

 

[Robert A]

Had the same problem a couple of months back after replacing # 8 fuel injector an a couple of coils the problem was resolved with cleaning the throtle body and replacing the PCV valve.

2000 Expedition XLT 189k