20 Most Recent 2009 Hyundai Accent Questions & Answers

In your owners manual there is a phone number to file a complaint to the corporation. Do that first of all. I owned a Hyundai that did very strange things although I had strange braking problems which was repaired at a shop of my preference and was reimbursed.
The problem with yours has to be an internal transmission problem. Nothing will be found unless the transmission is removed and completely torn apart for inspection. More than likely a brass bushing is egged out making the trans to act so eractic

Could be as easy as a clogged Air filter/intake or as difficult as a stuck fuel pump in the cold. Could also be dirty/loose battery connections. Have you ever tried a fuel injection cleaner in your gas? I use Lucas Seafoam and it works wonders on my engine ('05 Ford Sport trac), the thing still runs like brand new.

The fuse box diagram of the 2009 hyundai sonata is below, have a look

If you smoke that cap down to 20 ft-lbs you’re gonna be one mad cat!

Fuse or motor brushes.

it's a little high but it should be OK, most put out 14.8 and above

most likely problem injectors switch them around and see if the fault moves to the different cylinders

didnt specify vehicle --generic answer -buy plugs and have information for correct gap need proper spark plug socket--start by removing s/p wire remove s/p replace plug and wire than on to next How to Change Spark Plugs How to Change Spark Plugs in Car

tthere is no inertia switch , is pump working or fuel pump relay

check the valve timing again check the firing order ( could be 180 degrees out in timing) do a compression test to check for bent valves

18 ftlb plus 60 degrees plus 60 degrees

If you brake in snowy or rainy roads it will do that. Or if you break too hard

Your fogs only working when low beams are on is normal, as far as your low beam lights not working, I would have the headlight switch checked, or check for a bad fuse or possibly a relay if your car has a light relay. Some do and some don't, I am not that familiar with your model of car to tell you for sure.