Banks use a 28 / 36 debt ratio to decide on whether to lend to you.
This means you can use 28% of your gross income to service your housing costs leaving 8% for your remaining debt service (such as car loans,
Assuming you have no other debts and will use the entire 8% for your car you can spend $466.66 on a car payment and any associated insurance costs.
Assuming you pay $150 a month for insurance you have about $300 a month you can use on a car payment if you have no other debts.
Search "auto loan calculator
site:edmonds.com" on google to get a great car affordability calculator to help you see how much you should finance and what your down payment should be to.