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Please help I’m at a total loss. Sometimes it fires right up and others it takes several turns of the key.
brand new fuse box from ford. Cleaned up grounds. New starter relay, new starter, alternator, and battery. Have taken it to a shop twice and they’ve been no help. Any ideas as to why!?!?
You need to refine your symptoms . Can you determine if signal getting to starter solenoid during a no start . You can run your own wire from down below to a bulb in cab to see . Or is it being blocked by an intermittent connection in transmission switch underneath . Or is it being blocked by your pats system , maybe not recognizing your key at times . Pats from pcm allows a ground to get to start relay if satisfied . You can solder a 12vdc bulb to some long wires for test .It may be wise to have one from negative of battery to stop false readings from poor ground . A bulb is very visible and draws some load which more proves a solid source.. If you are looking for a ground supplied then swap your reference to 12vdc positive at battery . .,the bulb doesnt care about polarity . You can use a meter but bulbs are easy to see from a distance.
Get back to us after some testing .
A bulb is very visible
"sometimes it takes several turns of the key".......... and is it doing NOTHING when you turn the key, or is it cranking and not start?
If doing NOTHING, try another key... Or turn your key to ON, not START... thief light comes on for 3 seconds, then goes out after the computer recognizes the key...
Hey everyone. I apologize. I have a 2007 f150 xlt 4.6. I greatly appreciate the feedback. Im not much of a mechanic when it comes to the electrical side of things but I definitely should work on it. When I said it’s doing nothing I mean it’s doing nothing. No cranking. It’s very intermittent. After however many tries or “whenever it feels like” the second it does begin to crank it fires right up with no problems. There’s just inconsistency of the signal getting all the way to the starter.
What does "nothing" actually mean - absolutely NOTHING or something but not everything you're expecting? You have to be thorough in your details, we ain't psychic.
Yes everything appears to turn on as normal . There is electricity to everything that I can tell. All gauges are where they are suppose to be. You turn to to the on position and everything appears normal. It’s when you turn it to start that nothing happens. No crank, you can hear something over by the fuse box, but like I said the entire thing just got replaced(keeping in mind this was happening before it got replaced as well). You can turn it to the start position several times and nothing happens. Then try again and it fires right up. It just doesn’t make sense because it’s so random.
You do not have a "nothing" problem, you have a "No crank" problem.
Do you hear the starter relay in the CJB "click" every time you have a failed starting attempt? You'll have to listen very carefully for that and use a two stage key turning sequence so you don't confuse any sound from the starter relay (which should energize only in START) from the other relays that energize when the ignition switch goes from OFF to RUN.
Is PATS happy or not?
Is this a manual or automatic transmission?
brand new fuse box from ford. Cleaned up grounds. New starter relay, new starter, alternator, and battery.
Why were these parts replaced? Before or after this intermittent no crank issue manifested?
oh man, i chased something like this on my '07 5.4... never figured it out. it would be fine for a year or more, act up once, then either be fine for another year, or do it every time for weeks on end.
what i did figure out was i could get it to start by popping out the starter relay in the box in the passenger side kick panel and crossing the terminals with a jumper wire when it would act up, so at least i wasn't stranded.
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