OH the horror. I have a 1998 ford contour se 4cyl. I am pulling a P1131 and PO171 code. I have fuel pressure between 30 and 45. I have replaced the front O2 sensor the air filter the fuel filter, the spark plugs, cleaned the MAF, replaced intake gaskets and one faulty vacumme hose. Reset the computer and THAT DARN LIGHT came back on! Oh and did teh carb clean test for varience in motor when sprayed over and around vacumme hoses and get no varience. Whats left? Where do I look next to find the problem?
Rescanned the computer for code/s again and post them
July, 22, 2011 AT 5:52 PM
Dear Rasmataz, These codes are after I reset the computer and drove it. As soon as I got it on the freeway the check engine light came on. The LT and St Fuel
trim are at 0 and I get P1131 and PO171. What have I missed?
July, 22, 2011 AT 8:50 PM
Lean fuel condition could be caused by one of the following below: 1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.