Loose battery terminals causing a stall?

[iceninexp]

Weird problem. FJ62 would not start. Cleaned and tightened the +battery connector. It starts but occasionally it will start and then slowly stall out.

I'm thinking I just need to replace the entire battery head connection.

Doe it sound reasonable that a flaky connection would cause this intermittent issue? Switching from battery to alternator after starting I'm pretty sure there is some ECU monitoring that happens and if the connection is flaky it will just stall out (and stop things from frying).

Battery tested fine as did the alternator.

Thanks for any responses

 

[jawjatek]

Not sure about the stalling. I highly recommend @Fourrunner 's battery cable kit. I replaced all the power cables in my 60 with this kit and had no more starting issues. YMMV

FJ60/FJ62 Heavy Duty Battery Cable Sets

 

[iceninexp]

Thanks @jawjatek. I replaced the battery cable kit last night and after I drive for about 10-15 minutes it still wants to stall out after turning the vehicle off and restarting. I'm a little confused but I'll search through the forums.

 

[Fourrunner]

Check your fusible links.

 

[g-man]

Battery power is for starting. alternator power is for running and charging the battery. If your alternator and voltage regulator die or lose more voltage than your battery holds then your car will pull juice from your battery. If this happens you will see your voltmeter, ammeter drop and the charge light on the dash come on. The only current your motor needs to run is that going to the coil. The coil then sends current to the distributor and on to the spark plugs. A hot wire coming from alternator goes to ignition then to the coil. So theoretically you can disconnect the battery once started and electricity generated by the alternator will give you spark. If you have a problem ie loose wires, burned wires, loose or corroded grounds, worn switches....with the ignition switch, ignition wiring, coil, ignition fuse or grounds to any of these...that would cause a lack of current to the coil and a stall. Big wires from battery to starter motor and ground will not cause a stall unless somehow they cross or a hot is grounded and drawing current from your alternator to the point it can't send to the coil. If that were the case you most likely would not be able to start. There is also an ignitor not sure what it does exactly but it is part of the ignition system and worth researching.

check out the coil and the wires coming to it, the ignitor and the ignition switch. After that the entire ignition system..wires, grounds, fuses.

Beyond this maybe it is not an electrical problem. Always think it takes these things to make a motor run: spark, fuel, air, compression and timing. When it won't start pull a spark plug and hold it 1/8th inch to 1/16th inch away from a ground and have someone turn the key to check for spark. No spark means you have narrowed it down to the ignition system. Clogged fuel filter, are your injectors wet?

 

[iceninexp]

Thanks so much @g-man and @Fourrunner.
I guess I know what I'm doing this weekend.

Great explanation g-man. I guess I'll start by checking all ignition system wiring... I'll post updates. Thanks again.

 

[iceninexp]

Just an update. After ruling out electrical issues it turned out it was a crusty throttle body. After a clean up everything is back to normal