Question about Ford F-150

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I own a 2003 F150 crew cab with 124000 miles. My diagnostic reading is 1 code P0301, milon, Monitrs, o inc, 8 ready, Misfire, Fuel, Comp, Catlyst, Evap, p0401, p0316, 02 Snsr, 02 HTR, EGR.

Replace EGR valve removed and replaced one new coil cylinder #1.Spark apuges and air filter & coil boots. oil change and replace all tune up parts. one new thermostat, gasket, 2gallon antifreeze, flush system. replaced cable asy-BA wire. replaced 2 upper control arms. 2 new lower ball joins. remove and replace flex plate oil change and lube. removed and replaced AC compressor. removed and replaced Idler Arm. New replace starter. My car is still not running right. the RPM is out of control staying over 3 RPM even when I am driving slow. My engine acts like it is slipping and trying to catch up running with the truck. It sounds like water is running in the engine.

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Not sure what you still have for codes after the flurry of parts you have thrown at this thing. If the egr problem is not fixed it will be the DPFE sensor or the hoses going to it. It is located by the egr tube and a is a same rectangular box with two hose attached from the tube. One is larger than the other and if you get the hoses backward you will still get the 401 code. The 316 is a random miss which leads me to believe to have a large vacuum leak which will explain the high idle condition. The iac can't slow the engine down if air is getting in after it. Basically all the iac does is gives the engine a controlled vacuum leak. Run the engine and listen for a hissing noise. If you don't have a tester to monitor pid data use choke cleaner and spray around possible leak areas looking for a change in idle. The idle changes you have found your leak. The vacuum elbow on the throttle body collapses on those allowing in metered air. Hope this helps, Mike.

Posted on Nov 26, 2014

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Mass air flow sensor checked?

Posted on Nov 24, 2014

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2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
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