Hyundai Repair: 2002 Hyundai accent battery, crankshaft position sensor, camshaft timing


Question
QUESTION: I can't seem to find a battery for my 2002 Hyundai accent, it has a 1.5 engine. Is there a special battery that I have to get for this car?

ANSWER: The group size of the battery for your car is 121R.  Unfortunately, it's not a common size.

You should be able to find a battery at your Hyundai dealer, and your local auto parts store should be able to get one in the correct size, even if they do not have one in stock.  If you need one quickly, the dealer may be your best bet.

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QUESTION: I have a hyundai accent 2002 and it just shut down on me! I have been trying to find the problem, it will start and run for a little while then stop! I thought it was the fuel pump but I replaced it and it still not running! Recently a mechanic said it was a sensor but his accent made it hard for me to understand what the sensor was called, it sounded like he said king sensor but after talking to the Hyundai dealership they said there is no king sensor. But he said it sounded like a cam sensor, I got one got it put in and it still won't start. Does anyone know what could be wrong?

ANSWER: A faulty crankshaft position sensor (sometimes called a crank sensor) would make a car stop running and crank normally without starting.  Failures are often heat dependent, so many times the car will again start up after the engine cools.  Later as the engine reheats, the car will stall out again.

Anytime a car exhibits a crank-no start condition, it's important to attempt to determine which part of the spark/fuel mixture/compression equation is missing.  This will greatly assist in isolating possible causes.

Does the check engine lamp illuminate when the key is turned to the on position?
Are there any stored trouble codes?
Do you receive spark from the coils when the engine is cranked?
Do you have fuel pressure?
Is your camshaft timing correct?

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QUESTION: Before the car started going out the check engine light would come on but I haven't noticed it lately. I don't know what stored trouble codes are, and there are no sparks from the coils when the engine is cranked.  The fuel pressure is questionable because I just got the fuel pump changed and it didn't start after that. The cam sensor was just put in yesterday and it looks to be in correct, is the camshaft timing different from a cam sensor?

Answer
The camshaft timing is controlled by the timing belt-- it refers to the camshaft position in reference to the crankshaft position.

So far, everything you've told me is consistent with a faulty crank sensor, but there are other possibilities, too.  If you have the capability of reading the diagnostic trouble code(s) or having them read for free, do that first.  It'll help tell you what the computer saw that was abnormal.  Otherwise, you need to make a choice as to how you're going to proceed.  You can try replacing the crank sensor realizing that the problem may be elsewhere, or you can spend money on diagnosis, realizing that the problem may just be the crank sensor.