Quote:
Originally Posted by dfordski
A code P0171 &/or P0174 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor. This can also affect EGR function.
Possible solutions include:
* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Take it off and spray it with electronics cleaner. Don't touch the element w/ your fingers! Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure Might try a bottle of " Lucas Injection cleaner" to improve Injection performance. Also, as mentioned by others "Good Plug wires cut alot of crap, now and later." You could also have a couple of bad wires right out of the box and Ford 8 cylinders are famous for routing method complications. & plugs can become compromised during installation. Fouled w/motor surface grease/debris, Gap not checked or smacked closed, broken insulator, ect. A compression check (to make sure your not beating a dead or lame horse) & a check of what your base timing is set at, are good things to be aware of. Stock timing is 10BTDC(Before Top Dead Center). If your compression is good & balanced, and you rectify your other problems, You might appreciate bumping it up to 12BTDC. But first things first!
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I gave up, not enough time. Took the truck to the shop, knuckelhead told me I have 10lbs of compression in #7! 5,6, & 8 all varied between 60-75lbs, WTF?! This truck runs too damn good to have almost no compression. Just blew $155 for nothing. Guess I'll have to find the time and check the list you provided. Just thought you might want to know.