Hi,
Since you are having the same issues and it has a manual transmission, have you checked the clutch safety switch? In the manual, it is referred to as an ignition lock switch, but in reality, it is a switch at the clutch pedal that allows the starter to engage after the pedal is pressed.
If you look at pic 1 below, I highlighted the switch I am referring to. Here is what I need you to do.
There are two wires going to the connector on this switch, a white and a green. The green wire should have power with the key start position with the clutch released. The white wire shouldn't have power until the pedal is pressed (key in start position) check both wires how described, clutch depressed and not depressed with the key in the start position.
Also, make sure the switch is not loose and the bumper that presses on the switch is not missing.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Note: The wiring colors provided are for a 2004 Hyundai Tiburon V6.
Let me know what you find or if you have other questions.
Take care,
Joe
See pics below.
Image (Click to make bigger)
Wednesday, December 15th, 2021 AT 5:32 PM