Question about 2006 Ford F-150
5.4 3 valve
Run the fault codes to check which sensor is switched off. It could be a crank position sensor but it could also be a cam shaft position sensor or immobiliser that is non operational.
Posted on Nov 10, 2014
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Posted on Jan 02, 2017
take the gas cap off and have some one listen when the key is turned on and listen for a humming if it hums its working you might want to replace the crank sensor that's the most common reason for no start
Posted on Dec 20, 2011
Testimonial: "checked for the hum and nothing. Bought a new fuel pump, removed the old pump and installed new one along with a new strainer & fuel line filter. Works great now. Thanks! Btw...the pump is inside the fuel tank & you must remove the tank in order to remove the pump. This isn't too complicated but it takes some time, patience, & a little help."
Its pretty hard to test the fuel pump relay. Easiest way to test fuel function is at the motor from the fuel rail. There should be a high pressure fitting (similar to a tire valve stem) that you can push in to check for fuel. It should squirt out (fuel) if the pump is sending fuel to the motor and if not start back tracking looking for fuel pump/pressures/leak issues. If you decide to replace the relay then I would suspect $30-$50 or find a decent on at a junkyard. The relay should click when ignition is turnerd so u know its working properly.
Posted on Jan 22, 2011
SOURCE: 1998 Ford Explorer, 4.0 SOHC No
You are at thhe right trail what controls spark is coil pack crank sensor sparkplugs and plug wire but the most important is power . I mean 12 volt connections and ground This includes checking fuses you need a simple volt meter doesnt have to expensive or fancy just to pick up 12 volts let start with fuses in the engine juction box (there not mark to what it belongs to) make sure none are open. especially fuse 19 and 24 , next go to the crank sensor make sure the tabs are snuggly on now to the coil pack there is a red and light green wire this comes from ignition and feeds 12 volts at the coil pack measure that voltage is it 12 volts if not correct it this is from ignition switch ( you can make a tool that feed 12 volt with a wire and a fuse in series and attatch it to battery and the primary wire this is known as hot wire) next go to the ECM wiggle the wires see if that get a connection going if not go back to the ICM here are the wire you are to measure the tan light green, this is from ECM and it is pulsed it measure 5vlts to 0 volts switched then measure the tan orange the same thing 5 volts to zero,then tan white again 5vlts to zero. any one of these 5 to zero fails you fix is the ecm
Posted on Aug 21, 2011
SOURCE: 2003 ford Taurus DHOC 3.0
The PCM is located in the rear right corner of the engine compartment, sticking to the firewall:
The PCM can be replaced with a new or used god-working one. In both cases the PCM must be reprogrammed using a Tech 2 tool that costs about $3000. The operation is done at the garage.
The PCM is unlikely causing misfire on a single cylinder. Check wires going to spark plugs. If the coil is getting no 12V on the ignition side check ignition. It is strange that one coil has no power, the engine usually does not start when that happens because the same coil gives power to spark plugs on different cylinders.
Check if there is a capacitor fixed to the head aside the coil (there should be one). It should be cylindrical and one inch long, held by a single screw and located aside the coil. If there is a capacitor, that must be replaced with the coil. If you have not replaced the capacitor that is probably involved in the problem.
If you have already replaced crankshaft position sensor, check crankshaft position sensor harness in PCM. I uploaded here the bulletin with CKPS to PCM testing:2003 Taurus CKPK PCM testing.
Test the PCM and CKPS connectors. Check again voltage to coils and spark plug cables. I understood that spark plug cable nr.3 has no spark from coil. Check DC in from ignition to coil.
Posted on Sep 01, 2011
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