It would be helpful if you could list out your monthly gross & take home pay, as well as the total amount of all liabilities (for example, you have a car payment, how much do you owe? same for the home equity line.)
First of all, if you are getting $1,700/mo from social security and have $1,700/mo in expenses, you will be okay in retirement. Your goal now is to save what you can in your 401(k) to give yourself a margin of error for emergencies (home improvement, health care, etc). So please take my comments as suggestions for how to further optimize.
My overall impression is that you have too much car and too much house. You should consider downsizing both. If you are unwilling to sell the house (understandable if so, but please consider the option), then I would suggest immediately taking in a renter, so that you can use the rental income to boost the 401k now while you are still working.
I would strongly urge you to consider selling the car and getting a used model, or considering whether you can do without a car at all. Getting rid of that car payment alone would boost that 401k tremendously.
Beyond that, you have $300 in food/household+$25 sundries +$25 misc=$350 for food & household. I'm able to easily live on $125 for groceries and $75 for household, so consider cutting this down. You may need to more closely analyze your grocery bills to do so.
In your situation, I would shoot to set aside $5k for emergencies before hitting the $10k of home improvements, and then boost that emergency fund to $10k once the current round of home improvements are paid for.