blake0528

My truck was running a little rough, yesterday as I was driving it died on me going down the road. once i got to a safe position it would try to turn over 1 time and suddenly stop. I thought it may be a battery or alternator issue but both checked out fine after i had it tested. so i figured since it was running rough it could be a misfire. i changed all the plugs and wires and ensured everything was ran the way it was supposed to be. still the same issue. the truck will try to turn over 1 time and just stop. i googled it and thought it could be the coils but they are a rather expencive part since i need 2 and i am on a budget but need the truck for work. its the 4.6 triton. i am hoping someone can give me more of an idea where to start because i only have a day or so to get it running and i hope it hasnt locked up somehow.

Jbrew

Since it doesn't crank at all now, check your battery cables and mega fuses.

BareBonesXL

Not really clear what you mean here. It has to be turning before it can stop. So it's either trying to turn over but doesn't or it does turn over then stops.

Turn over and crank mean that the crankshaft is turning. Start and fire mean that the engine turns over on its own from combustion without the starter motor.

blake0528

im not having an issue with the voltage. it may be my stupidity. im not much of a mechanic. but everything is lighting up like its supposed to. i had a pressure washer once that had hydrolock. is this something that can happen in vechicles. im going to take all the sparkplugs out and see if i can get it to try to turn over.

blake0528

i appologize im not much of a mechanic. it sounds like its turning over just once and then stops. the engine does not start. its almost like hydrolock that my pressure washer had before. would a bad coil stop it from continuing from turning over? its really the best way that i can explain it.

BareBonesXL

The odd thing is that it died while driving and now it won't crank. Removing the plugs will show you what's happening in the cylinders. Hydrolock is a decent guess. Good luck.

A bad coil would not stop the engine from turning over, don't waste your time and money on new coils.

white89gt

Hydro lock... did you run it through deep water? Did you have a very strong smell of fuel before and after it happened?

16IngotFX4

If you have an open injector it can hydrolock. It can also run rough.

I'm not trying to be a bad news person, but I'm not sure this is a one day internet fix. Lots of question. Daylight is burning.
You may want to consider looking for help getting to work for a day or two until you can get it sorted out.

You would want to connect a fuel pressure gauge to the fuel rail. Turn on key and see if pressure is stable. If fuel rail pressure bleeds off, fuel is going someplace, it could be going into a hole due do a bad injector.

I would start with checking the battery and fuse like was mentioned earlier.
You have symptoms of a corroded battery terminal. Please don't argue this fact, like happens every time it is suggested. You will not be able to see the corrosion necessarily. You may get lucky by removing and reconnecting the battery connections. I suggest cleaning the battery post and the inside of the clamping surface of the cable clamp. A light sandpaper is all that is needed. Caution: the material is soft and you can quickly remove too much material.
I only mention the part about not arguing because 1) you have a problem that nobody can easily troubleshoot over the internet 2) you have the symptoms of a poor connection (assuming you have full electric, just no starting/cranking). 2) people in your situation refuse the help and become argumentative enough saying there isn't anything wrong with the connection because they used their untrained eye to look at it. It will take 5 minutes to prove me wrong. I would rather that happen than to go back and forth with people refusing to solve a problem based on viable solutions.

If the battery cables were removed for the alternator and battery test, then you can skip my suggestion if you'd like.
How was the battery tested -did it get load tested? A load test will prove a bad cell without enough juice to crank but enough juice to turn on interior lights, etc.

All I an think of off the top of my head is you have a poor electrical connection causing reduced power to the starter that is unable to turn the motor over. Or you are experiencing a hydrolock situation.
I don't want you to test because I don't want you bending a valve. But if it is seeing too much fuel, it would turn over like you mention, but probably more than one rotation, for example. It would become progressively worse though as each key on cycle would spit additional gas into the cylinder making it crank less and less each time, until the hole is full then it won't crank until the fuel seeps past the rings.
Given that you can only get the motor to roll over once, It is less likely to be hydrolocking and could go back to the electrical issues not providing enough power to the starter.

I do not know enough (anything) about the mega fuse, but in theory I would expect if that were bad you can't get even one crank out of the starter. I could easily be wrong because like I said, I don't know anything about the mega fuse.

I guess to grasp at straws, timing could be out if you can only get one crank. But I think if timing is bad and/or a valve is open when it should not be, the cranking would surge, not stop.

BareBonesXL

It will turn over easier with the plugs out and reduce the possibility of bending a rod if it is hydrolocked. Plus, any liquids will squirt from the offending cylinder if it is if hydrolock. Removing the plugs, examining them, then attempting to turn it over will safely answer many questions.

Really though. if it was running when it died and it won't crank now, damage is probably already done.

blake0528

i removed the cables and there was a little corrosion on the ground. i cleaned that off. with a file very carefully not to take to much off or damage the terminal and the cable. there was not a progression of it not starting. it has always started right up until now so maybe hydrolock isnt the answer. one of my friends did say that there could be a short in the starter. the battery and alternator were tested at the local part store. i have a little thicker skin than to get offened or defencive when i am asking for help no matter the platform. im going to try a few things. i appreciate your input on this.