P0171 on '99 Ford Escort ZX2
By doing research I found out that it could possible be two things. 1.) MAF Sensor is dirty or not working. 2.) Vacuum leak downstream of the MAF Sensor. My question is, is this a do it yourself project? I'm not a car guru, but I can do regular maintenance. Where is the sensor located and how do I change it? Thanks!
Check the pcv valve and the hoses going to it, pretty common for the hose to split and cause a vacuum leak, if the hose and valve are good, then possible the MAF heating elements need to be cleanned or there's a leak in the air intake snorkel. Check fuel pressure to be sure it's within spec Good luck and keep us postted Jeff