1997 Hyundai Elantra Logo
Posted on Mar 20, 2009
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Misfires on 1997 Hyundai Elantra!!!

Replaced coil pack and new plugs. Codes of p0301-4 stating all 4 cylinders misfiring and another code saying possible gas cap and possible vacuum leak. Car starts fine, but is very lumpy, then when you try to drive, it gets worse and stumbles, hesitates, lumpy dont wanna pull itself hardly especially on an incline of any sorts. Gas cap seems fine. Car was just purchased off an individual, ran fine then next day BAM. From front of vehicle which way do you count cylinders 1-4 from left to right or right to left? Seen 2 different diagrams stating 2 different things. I have it the way it was originally from left to right 1-4. Don't know where to go from here. It is missing something fierce. Please help. Thx.

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  • Anonymous Apr 21, 2009

    car startes fine but when she idles down,gets the sputters but after a while goes back to normal only during idling,when driving everything is normal.

  • steve1229 Apr 23, 2009

    I'm having the exact same problem as mswain. I replaced the coil pack, plugs, plug wires, fuel filter and fuel pump. Even had the converter checked. Nothing has fixed it. Anyone help?

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  • Posted on May 20, 2009
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Can you please tell me how to fix these 2 codes on a 1.8L HYUNDAI Elantra p0707 and p0712 i just had the trans rebuilt and now these codes are coming up

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  • Posted on Jul 19, 2009
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Dude, first relax. All problems can be solved and fixed. My 97 elantra just went through this exact situation. My fuel filter was old and probably original to the car, it started to fall apart and one by on e my injectors started to clog. The first mechanic replaced #2 and a week later it happened again. This time a dealer replaced #4. Days later it happened again. I learned to take the fuel rail apart and bought 2 used injectors from the junk yard for 10 bucks.The car runs like a top. Is the idiot light flashing nat you? If so its the injectors. And the evap code is probably a red herring, Ive not been able to find my small leak yet. Good luck.

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P0301 is missfire at number 1 cylinder from drive belt side of motor,usually theres a small hole in wire booth going to plug in valve cover,spark arks on cover wall.p0300 code is usually a random miss fire on all 4 cyl.,from your comment,im assuming its the evap.syst.u can check for damaged hoses from canister,located in frt left wheel well,to access it,remove the inner fender panel.hope it helps!

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What causes engine misfires to stay after new plugs and coil packs?
Try swapping the coil packs around - like swap #1 with #2, and swap #6 with #5, see if the misfires MOVE with the coil packs swapped to the new cylinders or if they stay with the cylinders. If they move with the coil packs, the new coil packs are bad. If they stay with the cylinders, there's a problem with those cylinders. You DID replace that camshaft sensor, right?

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Hi there:A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

For example, a P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2; same condition in P0301 - cyl #1, P0303 - cyl #3 and P0304 - cyl #4.

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If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


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