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Old 12-22-2011, 09:00 AM   #1 (permalink)
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Default Car randomly shut off

Car is a 2004 with the I-4. My brother in law was driving my sister's car yesterday when it randomly shut off. It will crank but it will not start now.

From what I read, the crankshaft position sensor is a common failure mode. The car has 112,xxx miles and I am going to do the timing belt as well if the sensor needs replaced.

Is there any way other than using a code reader to get the codes from the ECU? Nissan's have a switch on the side of the ECU and if you turn it, the MIL blinks to indicate the P code. Does the Sonata have anything like this?

Thanks,

Tony
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Old 12-22-2011, 10:02 AM   #2 (permalink)
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Originally Posted by ajm8127 View Post
Car is a 2004 with the I-4. My brother in law was driving my sister's car yesterday when it randomly shut off. It will crank but it will not start now.

From what I read, the crankshaft position sensor is a common failure mode. The car has 112,xxx miles and I am going to do the timing belt as well if the sensor needs replaced.

Is there any way other than using a code reader to get the codes from the ECU? Nissan's have a switch on the side of the ECU and if you turn it, the MIL blinks to indicate the P code. Does the Sonata have anything like this?

Thanks,

Tony
You very well might not get a code for the no start. When I replaced my CPS on my 03 2.7 santa fe, I had never gotten a cel. I had problems for over five years where the vehicle would jerk like it was shutting off and then continue on like normal. I don't think any of the hyunda's have that blinking light method. If it is the CPS it is going to be expensive to replace, almost like changing out the timing belt. I'd pull a search on your social network to see if any friends have a reader.
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Old 12-22-2011, 10:39 AM   #3 (permalink)
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You very well might not get a code for the no start. When I replaced my CPS on my 03 2.7 santa fe, I had never gotten a cel. I had problems for over five years where the vehicle would jerk like it was shutting off and then continue on like normal. I don't think any of the hyunda's have that blinking light method. If it is the CPS it is going to be expensive to replace, almost like changing out the timing belt. I'd pull a search on your social network to see if any friends have a reader.
I've done enough work on cars that I should just pony up and buy one. I would be doing all of the work on this car myself, so it would only cost me parts. Rockauto.com has the CPS for 54 and the Beck Arnley timing belt kit with pulleys and tensioner for 121. so that's 175 + shipping. Not bad at all.

If the CPS is fubar'ed enough to not send enough info the the ECU to allow the car to start, I cannot imagine it not throwing a code. Are the Hyundai ECU's really that bad?
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Old 12-22-2011, 12:35 PM   #4 (permalink)
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If the CPS is fubar'ed enough to not send enough info the the ECU to allow the car to start, I cannot imagine it not throwing a code. Are the Hyundai ECU's really that bad?
It is in the DTC logic for turning on MIL.. alot of times we will not find 0335 until old part replaced and engine now runs that we see MIL, scan it and find the elussive 0335 code.
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Old 12-22-2011, 02:18 PM   #5 (permalink)
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It is in the DTC logic for turning on MIL.. alot of times we will not find 0335 until old part replaced and engine now runs that we see MIL, scan it and find the elussive 0335 code.
Interesting. I don't have an oscilloscope at home, but if I put my fluke multimeter in frequency mode, I should be able to measure a square wave from the CPS, correct? I don't know how else to verify that the CPS is the problem. It's a lot of work to replace the CPS if it is not the problem.
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Old 12-24-2011, 08:11 PM   #6 (permalink)
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2.4L random stall,, just replaced crank position sensor on Sonata yesterday (Fri 12/23)..

Timing belt, balance belt, tensioner, 2 drive belts, crank posiotin sensor and blade.

Makes (2) of the 2.4 stall in the last month or so for me.
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Old 01-07-2012, 04:05 PM   #7 (permalink)
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So I had an opportunity to work on the car today with the beautiful weather the east coast is having right now. I have tried three separate times to get the timing belt on correctly. Each time when I rotate the engine by hand to check for interference issues, the engine seizes up. I try to rotate it back (ccw) and the crankshaft only gets about a half turn. I'm done for the day because I'm running out of light. I took some picture of the timing marks because I am at a loss as to what is wrong.







What am I missing?
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Old 01-08-2012, 02:19 PM   #8 (permalink)
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I messed around with the engine a bit more today. What I found was the engine gets stuck right around TDC for cylinders 2 and 3. I do not think it is hitting the valves. With the engine rotated until it gets stuck, I can still open the valves slightly by rotating the intake and exhaust camshafts slightly. I have been very careful when rotationg the engine by hand, especially with the timing belt disconnected, so I do not bend a valve.

My theory is that a piece of carbon flaked off the combustion chamber and is now positioned in such a way that interferes with the motion of the pistons. I had this happen with a Nissan engine I pulled out of a Maxima to build for my car. I was rotating it by hand on the stand, and it froze up. Once I pulled the heads, I found the piece of carbon caught between a piston and a quench pad.

What do you guys think I should do? Is there something I can put into the cylinders to dissolve the carbon? Is there a way to remove it mechanically? Do I have to pull the head?
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Old 01-08-2012, 03:10 PM   #9 (permalink)
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All your timing marks look correct, but I want you to go to this topic --> Sonata 2.4l 2002 Timing Belt Complete Step By Step - Hyundai Forums : Hyundai Forum <--Read it carefully and verify you also have your oil pump/balance haft timed correctly before final assembly, as you align it 2 ways, and 1 way is wrong,,, it'll shake on you.


In your pic, to me your belt is installed backwards,,, I like to be able to read the print as I stand there looking at it.. Where did you get the belt ?? OE Hyundai ?? Hyundai belt has arrows on it to note rotation, and in the case of looking at your pic, the belt is backwards/upside down.





I just normally align all the marks, pull the pin, verify marks, and go.. guess I am too daring huh ? I can tell you from another tech mistake at last dealer... DO NOT START the engine without the crank pulley in place,,, the belt walked off on him and crashed the engine... bent a bunch of valves, nightmare for him and shop.
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Old 01-08-2012, 10:13 PM   #10 (permalink)
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I would never start the car without all parts in place.

The belt that I have has no arrows on it. I got it from Rockauto.com in a Beck Arnley timing belt kit.

I have read the thread you referenced, and I ensured the oil pump sproket was in the correct position today.

I would think that changing this belt would be as simple as you state: "align all the marks, pull the pin, verify marks, and go". That is why I am having this problem.

Something else has to be wrong. The crankshaft will not rotate any further, but I can open the valves slightly on the cylinders at TDC. The pistons cannot be interfering with the valves if I can open the valves once the crankshaft gets stuck.

[EDIT] Thanks for replying, btw.
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