Question about Hyundai Motor 2003 Elantra

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Check engine light on Elantra GT 2003

My rpms are revving at 4000 sometimes even if i am not accelerating. It happend yesterday and then my check engine light came on. I checked the transmission fluid and it is fine.

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Have the code scanned and that will pinpoint your problem. Most shops will do it for a small fee, some auto parts stores will even do it for free. In my area Autozone will do it for free, dont know if you have one close or not but its a thought. Or for about a hundred bucks you can buy your own and scan your codes, there are nice to have around. Without that code its just guessing at which sensor or component failed. But if you into guessing, maybe try Throttle Position Sensor.

Posted on Oct 03, 2008

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2 Answers

Loss of power on acceleration


check for vacuum leaks and possibly a bad vacuum modulator on the transmission. For the vacuum lines use an unlit propane torch. Engine running, pass the open torch along the lines. If you hear it rev, you just found the leak. no leak? have the modulator checked.

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Not driving a corvette? Just kidding. More details are important. How slow is your acceleration? Is it 0-60 in 8 seconds, or 20 seconds? What is redline on your car? If redline is 5K then 4000 is a good responsible shift point. If redline is 8K then shifting at 4000 is probably robbing your engine of it's torque and horsepower band. I believe the GTS model has an 8K RPM redline, the GT may be lower, but in that case, shifting at 4K is too soon for strong acceleration. Your Tachometer should have redline clearly marked. For responsible use, stay below that, maybe 10-20%. For economy stay further still, but for power you need to let the engine use it's RPMS, especially smaller and fewer cylinder engines usually don't make their power until they are half way through the RPM range and above.

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I have a 2008 Ford Escape, 3.0L V6. I just had a Super 40 flowmaster professionally installed today. I never tried revving my engine in neutral before, but I tried today so I could hear what the new...


Hello there,

This is a normal operation, all your doing is hitting the rev limiter. It's there to protect the engine from over revving. The Powertrain Control Module or PCM cuts fuel to the engine intermittently to keep the engine from revving past a predetermined RPM when in "neutral", and in "park" if it's an automatic. Just in case something like a foreign object or a small child or animal were to inadvertently depress the accelerator pedal and rev the engine too high and damage the engine in result. I hope this info helps, and just for peace of mind, I am a Master Certified Ford Technician. Enjoy your new exhaust!! I'm sure it sounds great!!

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It is actually hard to say without actually seeing the vehicle, but the target speed for your engine idle is around 750 RPM. The stalling after revving kind of depends on how high you are revving it and whether the engine is at operating temperature or not. This may be normal. Then again, it could be that the Idle Air Control (IAC) is not working properly.

The shifting from first to second at 4000 RPM sounds like a completely separate problem. This could be due to low transmission fluid level, sticking shift control solenoids, or possibly even a malfunctioning Vehicle Speed Sensor.

If the Check Engine light is on, have that checked first.

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THERE IS A TEMPERATURE SENSOR ON MOTOR WHICH CAUSES THIS PROBLEM... USUALLY IT SHOWS A NEGATIVE TEMP READING WHICH CONFUSES THE COMPUTER CAUSING IT TO REV UP....HAVE THE ENGINE DIAGNOSED ON A SCANNER....GOOD LUCK...

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