Truck turns over (starter engages) but doesn't seem to want to "fire". The weird thing is that while turning the key its like we aren't getting anyh spark but just when you drop the key in frustration you'll here the truck fire a couple of times (not enough to start but you can clearly here it hit on a couple of cylinders). This momentary ignition seems to only happen as you turn the ignition back to "off". I talked this over with a guy and he thought that my battery was probably not the best, perhaps the starter was drawing so much there wasn't anything left for the coil/plugs. I bought a new battery and it does the same thing, turns over like crazy but won't fire until you drop the key... the momentary spark isn't enough to get the truck to "start" living in MN where the high temp is 5 doesn't help.
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have somebody hit the starter with a hammer while somebody turns the key on the start position as he holds the key keep hitting the starter not at the solenoid at the round part if it tries to start then you have a defective starter now if you have a alarm system you are going to have tutoo isolate the starter to do a different test.
Voltage drop? I'm guessing you don't have a voltmeter, so turn on the headlights and observe them as someone tries to start the truck. If the lights go out, bad connection at battery, starter, or ground. If the lights get dim, probably the starter-it's drawing power, just not working. If the lights don't change, check for power going to the starter solenoid on the small wire on the starter; voltmeter or test light, check if the small wire to the solenoid has power when key is held in start position-in crank position. There should be battery voltage there when the key is turned to crank. If so, the starter or solenoid is bad. If no power there to solenoid, power is lost somewhere between ignition switch and the starter wire.
The 1st thing i need to do is clarify what you mean by "won't trun over" do you mean the starter motor spins the engine and it will not fire up or that the starter doesn't trun the engine over? If the starter doesn't turn the engine over do you hear a clicking coming from the starter solenoid when this happens? If so replace the starter solenoid the heavy electrical contacts are burned.
Unlikely! Crankshafts dont generally 'go'. Most likely is the starter solonoid is not firing and engaging the starter into the flywheel. Take the starter off and try operating it alone. Equally check that the cam belt hasnt snapped/shredded.