what would cause po301,po303,po307,po171 on a 1998 f-150 4.6l triton

Question

runs really rough. I know what the codes mean. just don't know the cause. I've got spark off each coil. Checked by using old plug and wire. Plug had arc when I turned motor over.

Answer 1

Hi there,

The P0300 codes indicate misfires on cylinders 1, 3, and 7. Here is a list of possible causes for you.

P0307 FORD - Cylinder 7 Misfire Detected

Read more: https://www.autocodes.com/p0307_ford.html

The P0171 indicates the air/fuel mix is too lean. Here is a list of possible causes.

P0171 FORD - Fuel Injection System Too Lean Bank 1

Read more: https://www.autocodes.com/p0171_ford.html