Question about Hyundai Elantra

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Hello, I have a 1998 Hyundai Elantra with 140,000 miles on it. I have owned it for five years and it has been running great, but about six months ago I went to start it, and it would turn over, but would not start. A few months went by without issue, and then this happened again, and it has been becoming more and more common since. After letting it sit for a few hours, it will generally start (or right away through the help of starter spray). When the problem became more frequent, I changed the spark plugs, tested the spark plug wires, changed the fuel pump, the fuel filter, and the fuel pump relay, to no avail. The car has never died while driving (even on long trips); just starting it is the problem. And like I mentioned, when the problem happens, the engine will turn over, but the car will not start... but it will always start if left to sit for at least three hours. One last tidbit, I am not that good with cars, but my friend noticed that there wasn't any "humming" from the fuel pump when I put the key into the ignition. Not sure if that's important or not. Thank you so much in advanced for your help. This is my first car, and I really really don't want to give it up, so I will try anything the problem could feasibly be. Cameron

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  • Alex May 19, 2011

    Is there any anti-thief system installed? even a factory one?

  • hartmac May 19, 2011

    Hmm, nope, no anti-theft system that I know of. Thanks for the quick response.

  • hartmac Jun 01, 2011

    Mike, thanks for the quick response! I already had the fuel pump (and fuel filter and relay) changed, but that did not fix the problem. My car does not smoke when it finally starts... should I check the fuel injector regardless?



    Something else just came to mind: a while ago I had my engine diagnosed and it said my crankshaft position sensor was faulty. I did not think much of it at the time, but could this be my problem?



    Thanks again.

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Get the fuel pressure tested first-your pump is probably getting tired. They do not tolerate being run low on fuel since they are located in the tank and the gas cools the pump-so if you run the tank under 1/4 level, it may be time to replace it, but when the car has been driven for a while and the pressure is tested, it might read low-another possibility is the O-rings on your injectors are leaking-does it smoke when you finally get it started? If so, they dry out and crack, flooding the engine-hence no start until the gas leaks past the piston rings, into your crankcase and oil-not good, since gas and oil are not great lubricants.

Posted on May 31, 2011

  • mike mountain Jun 01, 2011

    yes, the CRANKSHAFT SENSOR is absolutely the problem-it will act as a heat sink when it gets older, and they will cause symptoms exactly as you describe-change it, you will have no more starting problems when hot, the O-ring leaking would exhibit smoking when starting so that is not a concern-a crank sensor is not all that expensive to buy or replace, a decent shadetree mechanic can do one in about an hour tops and the cost is usually somewhere around $50-75 total. Let me know if this totally cures it-Mike

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