Back compression problem

You need to scan the ECM to see if there are any stored DTCs. Just guessing, it sounds like a bad cam or crank sensor. They can be temperamental when they get warmed up, if they are bad.

Hyundai makes a very good, low problem car. They don't seem to have any issues that other cars don't, and with proper maintenance, should easily get over 350,000 km. Timing belts and water pumps are common as well as basic maintenance items like oil changes and brake pads. Good luck!

clogged catalytic converter, classic example of what happens when they go bad. You have all the signs and symptoms. 98% sure its stopped up.

2,500 to 3,000 on a 12 yr old car. Newer vehicles with 6-9 speed auto transmissions sometimes run as low as 2,200. But your gearing is your gearing. Can't change that now.

ignore the electrical problem its a second hand motor end of story ,now change the oil every 6000kms with a oil filter every every third oil change and the engine will run forever ,use the cheapest oil you can buy from a supermarket ,Dont use the AC too much if you can help it as the front crankshaft pulley fixing isnt very good on these engines and excessive use of the Ac will result in the keyway wearing out and the timing going out then the valves start touching the pistons and as it gets worse then the valves bend and it bangs like drums in the notting hill carnival .

It is very interesting. But you can find more detailed information here.

Sounds like you may have a bad piston ring. Get a compression test done and that will tell you if the ring is bad or not. Also, try using a product called seafoam in your engine. The seafoam will clean your engine out very well.

http://forums.nicoclub.com/how-to-seafoam-your-engine-the-right-way-complete-diy-t126583.html

For more info on how to seafoam your car click the link above.

I need more details its starting problem or?

has it been driven too many kilometers ?
This should not happen at this age (2006) if not driven too much. If it is under manufacturers warranty then dont wait and take it to the service center as this could happen due to the oil burn within the engine. Atleast not at idle.

the oil has dried in the lifters, because it hasnt been changed regularly, it sounds to me you have to replace the lifters