Problem with starter switch some times it operates and other time

The ignition switch does not go to the starter solenoid . Pin 87 at the starter relay sends B+ voltage to the starter relay . Do you know what a starter relay is an how it works ? The ignition switch is an input to the PCM - engine computer . When the PCM sees this B+ voltage from the switch it energizes the starter relay sending B+ voltage to the starter solenoid . http://www.bbbind.com/free_tsb.html free wiring diagrams !

Could have a faulty switch,bad connection at starter wire or a faulty soliniod on the starter.

this could be your kill switch sometimes the switch gear getts water in and gets a bit of corrosion on the pionts ,this could be your starter soliniod or a dirty lead to your starter from your battery or your earth lead

Have you tried jumping the two big terminals on the solonoid. Careful if it is working you will get a spark,big srewdiver and just flash it.

sounds like the starter soliniod is stuck some times a few firm taps will free it but it will need replacing

bad starter soliniod. replece soliniod contact . or replace soliniod complete.

it is one of two things.

• the starter is either worn and brushes not making contact or an engine oil leak onto the starter. thus keeping the brushes from making contact you can check this by banging on the starter while someone trys turning the ignition back and forth to start.(making the click click click)

• ignition switch is weak, not providing enough voltage from the to kick the soliniod all the way to start the starter

The way to check that is to hot wire the starter soliniod little wire, to battery voltage. (the big cable on the solinoid)
If it turns over good, then you can either replace the ignition switch or install a relay someware near the starter to supply it with propper current to kick the solinoid all the way to engage the motor.
The relay acts as a remote starter switch that feeds more direct power to the starter solinoid.Now the only thing the ignition switch is responsible for, is trigger the relay.

check all fuses first, make sure brake lights are working.the soliniod that operates shift lock sounds like its not working, sometimes its the fuse or brakelamp switch. hope this helps.

Check operation of auto transmission neutral switch; if that is not faulty check 'Start' output from Ignition sw (or start slave relay) is OK;
If all above OK check for faulty starter motor operation.

You have a bad disk in the starter solenoid pull the starter and go to a shop and buy a new solenoid or flip the disk in the solenoid and sand the two contacts so that it will make contact.