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Could be the starter is going out. When it heats up everything expands and if a starters bendix is going out, it wont get enough power to turn the starter motor. Helps to have year make and model
If you are sure that all connections are clean and bright, including the battery to the ground and battery cable to the solenoid, jumper from the battery (+) to the solenoid (+). If the solenoid clicks, but motor doesn't turn over, your solenoid is bad. Try jumpering momentarily from the battery (+) to the starter (+) and that should cause the starter to rotate. If that makes your starter rotate, your solenoid is still bad. Be sure that your starter has a good ground connection
starter motor weak. weak battery or engine is seized. take the spark plugs out and turn engine over with spanner on the bottom bolt on the pulley. if thats fine and move the engine freely then check the battery try a jump off a good battery. if not good and still will not start with the spark plugs back in then the starter motor is weak and needs changing. can do any of these in any order you like.
check electronic spark unit ie coil pack going open circuit when hot will run but when turned off will stay open circuit untill cools down then closed circuit then will wprk fine
If the battery is fine, why jump it? Faulty thinking to state or think: all electrical in the car work fine. If it did the starter motor would be turning the engine over. The starter motor work on electrical...not all is fine.
check: 1) 60a starter fuse/relay. 2) voltage to starter when turning key to activate starter motor, this will rule out ignition switch or relay. 3) apply direct voltage to starter motor to detect bad starter motor.
if the battery is fine check if you hear a clicking noise coming from the starter motor when you turn the key to try and start the engine.
If you hear this noise then this is a good indication that the selenoid has failed meaning you need to replace the starter motor.
You can give the starter motor a hit with a piece of wood as some times this will get the starter motor working just to start the car but this isnt a permanent fix and could leave you stuck if you used the car.
Now if the starter motor isnt clicking but you hear a clicking noise coming from either the cars fuse box or the ecu when you turn the key to start the car then this would indicate a problem with the imobiliser this would need testing using a diagnostic machine as their is no other way of testing this to find out if its at fault.
Let me know how you get on or if you need further assistance ok
Check battery terminals are clean and firmly connected.
Check the transmission neutral interlock switch operation is OK.
Check +12V is appearing on the starter solenoid control wire when the ignition switch is held in the 'start' position.
If above ok, apply +12v directly to the starter solenoid activation control -starter should immediately engage.
If it doesn't run, you likely have a faulty starter motor.
Thai is either ignition cylinder or starter coil, or a problem with starter motor/wirings to starter motor.
The starter motor must be energized directly (in neutral, and possibly using a remote switch) to check that is working.
If the starter motor is fine, check that there is power coming to starter motor when you ignite. If there is no power, test power at ignition and eventually replace ignition.
Check that you have pushed the spark plug wires fully home on the spark plug. If it's not turning it could be the solenoid that connects the battery to the starter motor when trying to start or simply a flat battery. Check battery first, check solenoid by listening to a click sound, check starter motor for connections check any related fuses.
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