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Old 10-05-2012, 04:59 PM   #1 (permalink)
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Default 2003 hyundai Sonata wont start

Ok. I have a 2003 hyundai sonata purchased used. After a few months, it started quivering and shaking and had no power and would go dead when it came to a stop or when ac turned on. But it was starting fine just running rough. Changed the coil pack one morning and ever since, it will turn over but it will not start. So we changed camsensor. Still nothing. Fuel pump is good. All fuses have been checked and they are fine. Im stumped! Any help in the direction i need to go would be greatly appreciated! Thanks, a woman in distress!!!!
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Old 10-05-2012, 10:11 PM   #2 (permalink)
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The Sonata comes in two "flavors"
2.4L 4cyl
2.7L V6
And also different transmissions...
What is yours?
A VERY common problem is the Crank Angle sensor (also known as the crank sensor). It fails in both models... You might want to scan the Sonata threads for more info... The wires going into these sensors are covered by plastic insulation and the heat causes it to dry and crack and then fall off allowing the wires to short to each other and also to the engine block.
You also need to find out WHEN the timing belt was last replaced.. They need replaced EVERY 60k miles...If you fail to replace them and the belt fails you will destroy the engine...The cam sensor does not fail anywhere near as often as the crank sensor.
Dave
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Old 10-05-2012, 10:37 PM   #3 (permalink)
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they say my timing belt looks great. my motor is 2.4
The big mystery is that it was cranking fine but it was just running extremely rough. Found out one day which coil pack it was and it was running. changed it the next morning and it hasnt started since, though it turns over fine, just doesnt start.
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Old 10-05-2012, 11:18 PM   #4 (permalink)
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If the plug wires are mixed up from the coil change the car won't start.

Doublecheck make sure they are correct.
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Old 10-06-2012, 01:12 AM   #5 (permalink)
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thank you i will try that and let you know!
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Old 10-07-2012, 01:48 PM   #6 (permalink)
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Also the wiring from the 2.4L coil packs has been known to get brittle and fail.
I believe it goes behind the engine where you can't see it's path.. look for bare wires. Also check the IGN fuse as it may be blown. Also be sure to check the crank sensor for brittle wires.
Dave
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Old 10-08-2012, 12:03 AM   #7 (permalink)
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Ok. We checked the wiring of the coil pack and they are ok. Is the crank sensor the same as the sensor angle? the coating on some of the coil pack wires are cracked but the wire itself looks fine. Im at a complete loss here. lol
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Old 10-08-2012, 04:44 PM   #8 (permalink)
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Yep... That's the one...
Crank angle sensor = Crank Sensor..

There is where the wire insulation problems become a common problem.
The 2.4L is much harder to get at the Crank Sensor and IS labor intensive.
So it's better to go in replace the sensor, timing belt, counter balance belt and water pump on a higher mileage engine like yours as they are in the same area and the labor can be a "one time" charge instead of a charge for four different future problems.... Get a technician that KNOWS the 2.4 engine and about the counter balance cam.. If the TB or the counter balance belt are not done you WILL have problems.

Check the plug that attaches the wires to the coils also. The plug can fall apart and the connections to the coils can become intermittent. I believe the Coil pack wiring harness away from the coils may either wear through allowing them to short to the block or the plastic insulation becomes brittle and falls off and the wires short together.. Check the wiring closely
Dave
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Old 10-09-2012, 02:15 AM   #9 (permalink)
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Thank you so much.. i had it towed to the shop today to run a complete diagnostic test on it so I'd know for sure. No way to really tell if its the crank sensor without testing it, or atleast thats what Im told. So I will let you know sometime today and I pray its nothing majorly expensive! I really love the car, the transmission is super smooth and shifts like a new one, uses no oil at all, great gas mileage and its in immaculate condition! Thanks for all of your help and tips. I def appreciate it!!!
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