2000 Hyundai accent, ran ok , next morning would not start.

More common problem for no start is the computer by the battery goes bad,.If you replace it get THE EXACT PART NUMBER ONLY.

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Hyundai Crankshaft Position Sensor Removal - YouTube

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Jul 12, 2012 - Uploaded by richpin06a
Hyundai Elantra Crankshaft Position Sensor Removal.

Hyundai accent 2001 - YouTube

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https://www.youtube.com/watch?v=fzqMNho3xIU
Nov 25, 2012 - Uploaded by mig dups
2000 Hyundai Accent GS turns over - no start. ... HyundaiCrankshaft Position Sensor Replace Timing Belt ...

If fuel ok then next check spark/ glow at plugs!

I believe your problem is with your crankshaft sensor. You may not have had to change glow plugs. Your problem seems to be with spark. If you change this part ,the crankshaft sensor, you should be OK. This sensor is located at the left front of your engine. Please let me know how you make out. GOOD LUCK.

My online Sonata manual shows these possibilities, but does not identify which applies specifically to 2000 Sonata.
Also, when you talk to the dealership parts counter, you'll need to know whether your 2000 Sonata is (a) 4-cylinder 2.4L MFI DOHC engine, or (b) 6-cylinder 2.5L MFI DOHC engine.
Its easy to tell - just count your spark plug wires.

-- begine excerpt from 2000 Hyundai Sonata Repair guide --

The crankshaft position sensor is located next to the flywheel.
The crankshaft position sensor is located next to the flywheel/torque converter.
The camshaft position sensor is located on the engine near the timing belt cover and under the upper radiator hose.
The crankshaft position sensor is located on the driver-s side of the vehicle, down by the lower radiator hose.
The crankshaft position sensor is located on the engine near the crankshaft pulley.
The crankshaft position sensor is located at the front of the engine near the timing belt.

--- end excerpt from 2000 Hyundai Sonata repai guide ---

Maybe the coil pack module that the coil packs sit on is bad if it's like a GM.

Changing the coil packs alone won't always solve the problem.

does it have a crankshaft sensor? My experience is cam position adjusts timing, crankshaft sensor allows ignition.

Check that you have a good engine ground and that all battery connections are clean and tight. If you are not getting fire and the coil is good, then I would suspect a faulty crankshaft position sensor. Hope this helped and best wishes.

DEFECTIVE CRANK OR CAM SENSOR.

are you saying that you have 12 volts to the coil but no spark out/if this is the case first make sure the cam is turning by looking in the oil cap hole,next yes the cam sensor is a common failed part and can cause the problem, you also have the crank sensor just below that and it would not hurt to replace also