code P0171
I just bought this 99 f250 super duty with 197k.
I changed all fluids and installed new spark plugs. I then changed the exhaust. I deleted the cat and replaced my muffler with a glass pack. Right after that I got a P0171. The pickup runs rough and jerks when driving it. I cleaned the MAF sensor. I did replace the fuel filter. I check the pvc hose under the throttle body. It looks good. What other hoses do I need to look at for vacuum leaks? I have read that it may be my O2 sensor. It ran pretty good until I changed the exhaust. I did add some marvel mystery oil at the same time. I did clear the code but still runs rough. Another problem My 4x4 light, service engine light does not come on when I turn the key on. All my other light come on then go off. My check engine light never comes on either. My ABS light is on but I know what the problem is their. The left front wire going to the sensor is broke. thanks for any help |
Something's making it run lean.
Start by checking the fuel pressure, and make sure it's 28-30 at idle, and 38-40 with the vacuum disconnected from the fuel pressure regulator. Any chance you have an exhaust leak ahead of the O2 sensors? |
I will look into the fuel pressure.
I will look at the exhaust but I did not here anything. thanks again for the help |
Check the vacuum hoses on both valve covers.
|
OK will do.
On the passenger side does the hose crack under the insulation? Can I cut it off and then zippy tie it back on? |
OK I am sorry for the stupid question but where is the fuel pressure regulator?
thanks |
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