Luxaire furnace ignitor shuts off before gas valve opens
The timing is usually based on conditions not all ignighters are the same some get hotter quicker,.
Quit throwing parts at it.
Look up your model , error codes, I found for that brand
7 or 8 flashes flame could not be established after several attempts,
2,3 or 6 flashes pressure switch problems,
4 or 11 flashes limit switch.
All of these point to different things and the timing being different can be because of the failure of a component or set point.
Most units have a removable panel that when you remove it it kills power to the board.
There is normally a plunger switch that can be pulled out and this is a service mode so you can see the flashes on the board when it fails.
Try this to identify what is causing it not to light and get to the problem without wag (wild ass guess) now you will be troubleshooting so you move up to swag (scientific WAG).