Question about 2004 Ford Freestar
Make sure the filler cap is tight. I have two thoughts: 1) that the emission light is entirely coincidental and that the Vent valve on the fuel vapour emission carbon cylinder is being left open allowing un-metered air into the inlet manifold making the intake mix too lean. 2) That when the fuel got low some dirt at the bottom of the tanks was sucked up into the fuel line with the result that either a) the uptake sock in the tank or b) the fuel filter is clogged preventing enough reaching the engine on each injection cycle. To test for 1) close off or crimp the line from the carbon filled cylinder to the inlet manifold. I fthis provides respite fromt the problem, change the vent valve. To test for 2) disconnect the low voltage to the coils (we do not want any spark) using an old towel (to catch the spill) disconnect the fuel line slightly from the fuel rail on the COLD engine. The fuel should spurt out under considerable pressure and with volume; even with the ignition switch is as position 2 (position 3 'ignition' is not needed for this test). Any suggestion that the flow is slow I would change the fuel filter. If the fault is not resolved after the above steps I would suggest you have the codes from the on board diagnostics read
Posted on Aug 30, 2010
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Posted on Jan 02, 2017
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The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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