Hello, f150 hard time cranking then fried some circuits no power
Hello, my f150 was having intermitent problems turning over, sort of like it was not getting enough power to crank the engine. Usually it would start eventually, but this last time I turned the key and it was hard to start (turning very slowly) so I turned the key off, but it continued to try and start for about two seconds on its own, then the battery died completely from fresh to nothing. Now it wont take a jump and has no power.(new battery). suspectig a short maybe in the starter or a bad solenoid. I could also smell burning wires, and the lights did dim when I tried to start it the last time. So I guess my question( besides a good tow truck serice) is what might cause the engine to have a hard time cranking. then starting eventually, but then frying completelly. Any tips for where to start would be appreciated; thank you!
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At the starter motor, two voltage circuits, one comes from the battery hot all the time. The other circuit goes hot with key in the crank position and is wired through starter relay. The starter motor grounds through engine block.
Your transmission range sensor could also cause a problem. Any testing, make sure tranny is in park or neutral and parking brake is set.
My info says you have pats security system, that can disable your starter, have to be sure your security system isn't causing a problem?
Sounds like the courtesy circuit was fried. Could also be connected to the cig lighter circuit. But it should have blown that fuse too.
The radio memory is powered from the courtesy/cig lighter circuit which is hot with the key off.
if it turnes over hard it is probably your timimg you can losen the bolt on the distributor and turn it down just turn it clock wise a quarter inch are so and try it if still hard to crank turn a little more it may be easier to have someone put a timing light on it.
This going to likely result in replacing the crank position sensor. This sends a signal to the vehicle computer to tell it when to fire/pulse the coil and injectors. I suspect if you remove one of the injector plugs and insert a circuit tester on the positive side(DO NOT USE A TEST LIGHT using a light "bulb" of any sort, they take too much power and can fry the computer)(the circuit testers use LEDs) that you will not find it pulsing while being cranked. Let me know what you find.
Try pulling the relay's in the engine compartment and sand the connetors for the fuel pump after see if it comes on, turn the key to the run postion and listen for 2 second hum. aslo put in Lucas fuel stablizer if it's been sitting for any leangh of time.
you need to change out the 7.5amp fuse in the fuse panel under the dash. make sure you look up because i missed it the first time i had the same problem. the trim makes it hard to see when you have the cover off of the fuse panel.Or you have a short in your wiring or a short to power of an other curcuit. do you know what the code is for the check engine light? what engine is in it?
Fuel problems are usually fairly consistent and not intermitent, replace fuel and filters anyway if it's near it's service interval. I think this thing is injected, but I doubt there is a problem with injectors ... again most fuel problems (unless it's the fuel pump) don't come and go.
Your username is dieselhuffer, in the states we don't have saturn diesels, so I am assuming your saturn is a gas engine. I would concentrate on the ignition system, ignition box, high power coil(s), wires (it's probably not these). Buy your mechanic friend the Haynes (about $20 from amazon, parts store or haynes.com) manual for your car, and have him go though the ignition system diagnosis portion of the manual. I'll bet you a pint it's an ignition problem.
The bad news, intermitent problems are hard to find. The (sort of) good news is, it will probably get worse to the point that the thing won't run at all, making diagnosis much easier. Hopefully you'll find the problem before you pull out much of your hair.