Question about 2004 Hyundai Elantra

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Rough idle idle rough worse when in D or R.Dealer & 2 other mechanics have given up.everything they could come up with has been fixed or checked has cost heaps.Engine mounts replaced,plugs & leads,all plugs even,filters replaced,all vacuum systems checked,inlet manifold cleaned,OCV valve replaced,computor codes shows no problem,compression tests normal.Unusually this car has no check engine light .any ideas

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  • Wayne Toms Jul 28, 2013

    also forgot injectors replaced ,car has done 130k,runs great otherwise

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 2001 xg300 engine runs rough - skips

I had the same car and the same problem.
My case I changed Air Intake
sensor(or call MAS), located right after air filter unit.
Good luck!

Posted on Dec 13, 2008

  • 1 Answer

SOURCE: 2001 Elantra stall, loss of power. Driving at

I am having the exact same problem with my 2001 Hyundai Elantra. I was told that the engine code that comes up when the sensor is on is called "Absolute Pressure In The Manifold". I was told by a "Hyundai Specialist" that when that code comes up it usually means that the seal on the manifold is Fuct. When my mechanic checked that out for me he had noticed that my manifold had 4 cracks in it(can varify cause he showed me). He replaced the manifold and gasket. The car ran fine for about 2-3 days and since then the problem has since come back and my check engine light will no longer go on/off it only stays on. Because of the check engine light always staying on I have noticed that on many occasions my car will hiccup many times in a row. The only way to stop the hiccup I have noticed is to take my foot right of the gas for approx. 2-3 sec then car will continue without hiccup(till it happends all over again). All in all I have been having this problem now for approx. 1 year and if there is somehow someway it could be repaired I would appretiate it.

Posted on Nov 06, 2009

  • 176 Answers

SOURCE: check engine light on, code P0443

Was the repair facility a Hyundai dealership? If not, I would recommend a second opinion from a certified dealership. This way you will have more information and a better idea as to how much the repair will cost.

The canister in your evaporator system may need to be replaced. These will fill with emissions and cause a trouble code. Hope this helps.

Posted on Jun 11, 2010

ghost45
  • 1280 Answers

SOURCE: Check engine light comes on for 2004 Hyundai Sante

First of all, why was the O2 snsr replaced?... Check Engine light? What DTC (diagnostic trouble code) did you find stored in the ECU (Engine Control Unit)? The drivability you seem to be describing can have multiple causes -- faulty sensors, malfunctioning computer, clogged catalytic converter, leaky injectors, vacuum leaks, etc.

Ok... this is gonna take some time. The 04 Santa Fe came with 3 (three) different/possible engines -- the 4 Cylinder 2.4 lit, the 2.7 V6, and the 3.5 V6. Only the 2.4 (4 cyl) and the 3.5 V6 are equipped with EGR. The 2.7 does NOT have EGR. To answer part of your question, the EGR system on the 4 Cyl is known to develop restriction(s) in the EGR port (from the # 4 cylinder exhaust port to the EGR valve at the intake manifold). This port travels through the head (front to rear, i.e., Left to Right when viewing the engine from the transmission end). This port cannot be seen at the # 4 cylinder exhaust port unless you remove the exhaust manifold.

It would be very helpful if you could provide more detailed/specific information regarding the drivability issue & what/which codes were found related to the Check Engine light.

Posted on Feb 16, 2011

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SOURCE: i have a 2001 hyundai elantra with a p0440 code.I

Sounds like you have done a lot of the right work here. I popped that code on my 2001 Elantra within the first 50k miles. Turns out that in my case the gas cap was the culprit. Keep reading though, maybe this still applies. My cap was still very new, and it's not that I forgot to put it on or to tighten it. The mechanic at the Hyundai dealership said this happened all the time to this car, and that you simply have to get the cap tighter. It has that ratcheting release so as to not over-tighten it, but here's the trick: Tighten as normal, allow a few clicks for good measure. Then, press in firmly against the cap and you'll see that you can get another 1/8 or so turn out of the cap. I popped this code 3 times total, the first time the dealer just reset the light. The second time was when he told me about this, and the last time was accidental on my wife's part. :) You can reset the light by simply removing the battery terminal... 30 minutes seemed to work for me... and then reattach. Of course it goes without saying that this is with the car off. Good luck!

Posted on Aug 13, 2011

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