Question about Ford F-150
Replaced vacuum line from the pcv valve. cleaned the maf sensor
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Posted on Jan 02, 2017
SOURCE: po171 po172 po174 po175 ???
If the fuel pressure was low enough to give lean codes then u would have a loss of power that you would easily notice, you say you checked for vacuum leaks, did you use a can of carb spray or a bottle of propane? it only takes a very small leak to trigger the codes, spray carb spray around the intake area, see if the engine sound changes, this will indicate a leak,
Posted on Nov 11, 2008
Check for engine vacuum leaks, use a can of carburetor spray and spray around the top of the engine, pay close attention to the intake manifold, if there is a leak the engine will speed up a little, also the MAF may be defective, cleaning it does not always fix the issue, which is the heated sensor wire no sending the correct signal. My knowledge base? Ford certified Master electronics technician.
Posted on Dec 12, 2008
Both appear to be a lean mixture problem according to my research. Have you run some injector cleaner through it by any chance? What about coolant level, is it staying up, pressure tested, just in case coolant is mixing with fuel via, head or intake gasket leak, and leaning out the mixture. Low fuel pressure will cause lean mixture in some cases, test it or at least change filter if not done recently, or both. Hope that helps.
Posted on Dec 12, 2008
dont take soo much in consideration after you have make all this things, some time is on only for any wire faulty, or a shrt electrical arc in any place in wire system. ask auto tap mechsnics for this maybe they have similar case before.
Posted on Apr 06, 2009
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