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I have a 92 F-150 with about 130,000 on it. Latley it will not start, i had the battery tested and they said it was fine. The alternator is charging. After driving for many miles and turning it off it will not start. And after letting it sit for a few hours it will still not start. Any input would be helpful. Thanks.
When it refuses to start, does it crank at all?? If it does NOT crank, does the starter solenoid (relay under hood) click?? Give us as many details as you can recall.
It will crank very slowly, the engine will only turn over once or twice before there is not enough power anymore. I replaced the starter less than 3 months ago so i dont think that would be the problem.
Who tested the battery, and what exactly were the results of the test? Just because you don't know how to do it yourself doesn't mean you don't need to check up on the people who do it for you. As far as you know, the battery is toast, but they didn't want to tell you for whatever reason. I suggest getting a Ford MotorCraft Silver Series battery because it has a better warranty than an Optima. It's about $80 at any Ford/MotorCraft dealer.
It does sound like a battery problem. It is possible for ONE CELL in the battery to give up suddenly. The remaining 5 will produce juice, but the bad one will act like a resistor. So a no load test MAY yield a good voltage reading, but the batt won't put out enough amps to crank (failure under load).
Check the solenoid and the ignition switch. I had the same problem on my 91 and it turned out to be the ignition switch. I don't know how or why. The truck had the problem for awhile and I could not figure it out. Then the acc. position stopped working and the electronics would do funny things, the truck would start but all the warning lights would stay on and the radio wouldn't work. I would shut it down and restart and it would be fine. So I replaced the ignition switch to fix those problems and by dumb luck it fixed the hard start when warm problem. Hope this helps.
Ha, thought I was the only one to have this kind of luck, I did the same thing, thought the starter was getting hot, bought shields, 4 new starters, still same problem, More than likely the problem is like mine, the ground strap, mine was slightly broken and getting hot , replaced it for 8 dollars and felt like a fool after spending 160 dollars on a starter and then replacing it so many dang times, hope this helps, also check the ground from the bettery to the motor, but I bet it is the strap.
Brian
Matercutz, which ground strap did you replace? I have noticed lately that I have been having some problems with the electrical system that I can't track down.
I have a similar problem with hot starting. I am about to buy another starter and heat shields. Before I do this let me get this straight. I have and need a good ground cable from the negative post on my battery to the engine block. I also need a ground cable or (ground strap) from the engine manifold to the firewall? I just noticed the latter was in bad condition and I replaced. Don't know if it helped yet.
The smaller ground strap to the firewall grounds the sheetmetal so small components and anything else mounted to the cab sheetmetal will have a good ground. You are right on all your cabling assumptions.
What exactly is your problem? What year truck and what engine are you working on? Does it crank hard when it's hot? Or not crank at all?
Thanks for your help. I was running down a hot starting problem with my 1969 ford. I am working with a rebuilt 390. It appears I was dealt a bad starter. After going through the entire electrical and fuel system only to replace the new starter the second time. My tuck starts great now. Good grounds and new wires all around make for one happy connection. I am now aware that the starter on this engine is prone to excessive heat due to its location. The sound is completly different coming from a fresh starter that does not have problems. Just because it was new did not mean it was good. Ahhhhhhhhhhhhhhhhhhhhhh......................... It works finally.