2002 Santa Fe 4-2351 DOHC Engine running very rough after timing belt replacement at 100,000 miles.

The 2002 Santa Fe 4 cyl and 6 cyl engines are deemed "Interference" engines. If the timing belt should break or slip a few teeth, the pistons will strike the valves and most likely destroy the engine. Thus it is very important to change the timing belt every 80,000 - 100,000 miles (along with a replacement water pump). I recommend buying a belt/pump kit and having a local independent shop do the install (much cheaper than a dealer's $600 charge!).

Belt & pump kits are available via Amazon:
http://tinyurl.com/lqsqpwo

Starting in 207 Hyundai started shifting all of their engines to metal timing "chains"... more or less eliminating the possibility of such a problem. However, water pumps still go out... but not nearly as often or catastrophic a problem!

"POP" LIKE A BACKFIRE???.....TIMING BELT IS 1 OR MORE TEETH OFF

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If the engine is a 2.4 L SFI 4 Cyl, the schedule is every 105,000 miles. I do recommend 90,000 to 100,000 miles is the best time to replace.

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Car Manufacturer's Recommendations A standard replacement period for the timing belt will fall between 50,000 and 100,000 driven miles. The owner's manual or service manual for your particular model will give you a specific time for replacement.

Yes, time to do these things.
FYI - you can purchase a complete kit for Water pump replacement which includes the timing belt, tensioner, gaskets, etc. You can't get to the water pump without first removing these items anyway, so do it before the pump fails or worse, the timing belt breaks and grenades your interference fit engine.

Example here: Amazon com Evergreen TBK313WPT 99 05 Hyundai Sonata Santa Fe Optima 2 4L...

Plugs are a piece of cake and it's time for those as well.
Replace coolant, and while you're at it, the thermostat.

I hope this helps.

Your Hyundai's engine is an interference engine, meaning that if the timing belt breaks the engine will suffer major damage. At least a valve job, probably the head being replaced and in the worst case an engine replacement.

The recommended replacement interval for a timing belt is 60k, your already over so I would replace it as soon as feasible.

Hi:
All of the engines in Hyundai santa fe are interference engines, so you should regularly change your timing belt. The timing belt also drives the water pump, so it is always a good idea to change that too, if you have the engine apart for the timing belt. Here is a link to check out!

http://www.theautopartsshop.com/auto+car-usa+parts/hyundai+santa-fe+engine-timing-belt.html

Carfixer 1 is right. The Hyundai engine is called an interference engine, which means that when the timing belt breaks, it will allow the valves to hit the pistons and you will ruin your engine.

Do yourself a favor and replace the belt at recommended intervals. If you are past the 60k mark, have it done right away and save yourself a lot of grief and expense.

sounds like the timing belt has left the game.

Could be a timing issue..
If it takes a timing belt & has not been replaced at the propper times - that could casuse serious problems if it breaks..