My kia wont start it seems to back fire on 1 exhaust stroke but it tries to start. but no go, timing belt and spring replaced timing set

Did you install the belt with the number one piston on the compression stroke and have the distributor pointed at the number 1 plug connector wire. If so, you must of missed the belt placement by one tooth. If everything was correct like you mentioned it should of started. So, you made a small mistake that you will have to check again where, Im sorry :.(

Number 1 piston on the TDC of it's compression stroke, distributor pointed at the number 1 plug wire.
When on the compression stroke, the valve rockers on that piston will be relaxed (sealed) and the rockers will have play in them at that setting. Both rockers, intake and exhaust on number 1 will be loose when on the compression stroke of that piston.

sound like timing off.if valve timing off engine not going to fire.during intake stroke if intake valve timing off engine cant draw air and fuel in for combustion wont fire.

If you have a weak spark it will not start since under compression it takes a much stronger spark to jump the gap as compared to a spark in normal air pressure. Try a good known working coil.

Back firing out of the intake is because the valves/cams are not set right. When you did the timing belt . did you set the crankshaft mark at top dead center of the compression stroke. If it's at the exhaust stroke this would cause backfiring and violent shaking.

sounds like the gears are off. did you make sure the cam and crankshaft where in proper alignment. if not the valves and firing order wont match up, stopping the car from starting or at least back firing. usually there is a marking on the engine block showing where the two gear pulleys should be positioned. the other thing to check is that the distrubutor is pointing to number 1 plug and that number 1 cylinder is at top of its stroke.

well try removing the distributor and spin it around half way 180 degrees then try. it seems you are off there are two ways to install the distributor because two turns for the crank equal one for the distributor.if still wont start call on me again i will help you .

Try a compression test, as it sounds like your car has jumped timing. (Belt or timing chain)

Are you sure the new belt didn't jump time? How was the belt tensioner when you replaced yhe belt? Did your water pump leak onto or into your crank sensor?Are you sure you have proper fuel pressure?When you replaced the timing belt, did you make sure to find top dead center on cylinder 1 ? Just lining up the timing marks may not have worked if this is indeed what you did.If you had the crankshaft rotated 180 degrees, your motor would be trying to fire on the exhaust stroke, instead of the compression stroke. To find T.D.C. disconnect your battery,rotate your crankshaft until the piston that is marked #1 in your firing order is at the top of its stroke, this can be accomplished by carefully inserting a wooden or plastic dowel into the sparkplug hole of cylinder#1. The dowel will rise with the piston and at the point where it starts to fall will be T.D.C. Now your timing marks should line up,and you will then be on the compression stroke. good luck! hope this helps

You said you did to specs but if that was the case the valves would not be open at tdc.
triple check your timing(get a light if nessisary)
check that you dont have the plug wires mixed up
Note:
Izuzu engines are very picky and if the marks are not correct after turning over two rotations as stated in the book it will not run.
(im also taking that this is the v6SOHC engine)

Sounds like you have fire in the plugs with the sputtering you mention...

You could a compression test to see if you have a burned intake valve, but this is less likely than a timing problem in my opinion as intake valves run cooler and are less likely to burn than an exhaust valve.

If the timeing belt has slipped then you test the timing with a timing light and it will id the problem with the belt.

If the timing belt has not been changed in accordance with the maintenance schedule, then the belt may have jumped a notch and gotten the valve train out of sync with the pistons... to test this, without a timing light, take out all the plugs and charge you battery before you test for a spark sync with the compression stroke. You must distinguish the compression stroke sound from the exhaust stroke sound. Now when the compression stroke ie piston tops for plug firing on this stroke, it will compression stroke will be the loudest.... now on the compression stroke for the #1 cylinder, the plug should spark when you hear the loudest swishing sound, ie, when the piston is near the top dead center look for the spark to occur when the plug is on the wire and grounded to the block or frame... If it sparks slightly before tdc that is OK, but if its firing differently than on the compression stroke peak, then most likely you will have to get a new timing belt and retime the camshaft at the same time.

Also, if you could place somthing over the #1 plug hole while you look for the spark, that would also be a good indicator of when it should spark because the comprssion will blow the obstruction off the plug hole. I don't think you can put your finger or thumb over it but if you had a broomstick, it may work equally well.

Once you isolat a possible timing problem, you must of course face that procedure or take it a shop.
good luck