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The Hyundai Elantra 2001 - 2005, 2.0 L engine is noted for this problem. It will lack power on acceleration and run rough and stall while driving. The engine light will come on for misfire codes. This problem is caused by a vaccum leak at the intake manifold gasket. The gasket is broken and needs to be replaced.
To replace the intake gasket with a new one, remove the 12m nuts holding the intake to the cylinder head. Then pry back( note: you do not have to completely remove the intake manifold here) the intake manifold to gain excess to remove the old gasket. Remove any excess gasket and clean with brake cleans the surface area of the intake. Install the new intake gasket on to the head and carefully install intake on to cylinder head studs. Tighten up nuts gradually and evenly to 15-20 ft.lbs.
Does th engine seem to run rough? Have you checked for intake manifold leaks? Have you contacted the dealer about a possible re- programming (refered to as a re-flash) of the PCM (powertrain control module) to correct this?
if no puddles or no keaks you can see, then its probably your head gaskets, or the intake gaskets leaking. look all around intake to see if you see any leaks. if you do its your intake gaskets. how does the coolant look! on my car when the intake gasket was leaking, it made the coolant look milky and a chocolate type mixture. so check it out first, the intake gasket. Coolant may flow through the gasket to the inside of the engine and mix with the oil. Pull the oil dipstick out and look at it. Oil mixed with coolant will have a thick consistency. Examine the oil filter cap for any rusty-looking residue. good-luck.
The head gasket goes between the block and the head, and seals the combustion process, and cooling water, and (if oil is pumped obove the heads to valve components) oil pressure.
Intake gaskets seal between the intake manifold and the head, and seal against intake vacuum, and in many cases, coolant.
A badly blown head gasket will so destroy compression in the cylinder that you can hear uneven cranking as that cylinder comes up on compression, kind of a “whir, whir, WHIR, whir, whir, WHIR, whir” with the capitalized whir being the engine spinning much faster due to no compression holding the starter back.
You will never be able to hear a problem with an intake manifold gasket until the engine actually starts to fire and/or run.
you can check the intake gasket buy spraying some starting fluid near the intake while the car is running if the engine speeds up the gasket is gone. you intake could be no good
The lower intake manifold gasket will be the problem. This is a high failure rate item and GM has redesigned the gasket a couple times in an attempt to correct it. Currenty Napa has the best replacement gasket and it is known as a "Perma-Dry".
I have done many and have never seen a warped intake. It's worth the fix, take your time and torque the gasket as per the instructions provided.
Good luck
oil from the pcv valve going into your intake manifold will cause a gasket to swell. but it should not be to the point where it's noticeable. you should probably replace the intake manifold gasket at this point.
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