Engine Performance problem
2002 Ford Ranger 6 cyl Two Wheel Drive Automatic 150000 miles
About thirty minutes into my daily commute home, the vehicle started loosing power, no matter how hard I hit the accelerator the truck would not go over 50mph or 3100 rpm. When the truck is in park it wouldn't rev past 3100 rpm. Put in a bottle of B-12. Ran good for 3 weeks. Happened again about 30 minutes into drive home, stopped put in three gallon of gas, which put me to over 1/4 tank, ran good for 10 more minutes. Limped home at 45mph. We have changed the MAF sensor, fuel filter and checked vacuum lines. Codes given said fuel mixture to lean.
PO171, PO174, Misfire on Cylinders 5 & 6. Any ideas what it could be? My next move is to check EGR valve or is this a waste of time?
Thursday, April 17th, 2008 AT 2:54 PM