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HELP! 2001 Hyundai Elantra Codes, How To Fix!!??

10K views 8 replies 7 participants last post by  cclngthr 
#1 · (Edited)
my 2001 hyundai elantra runs fine, then decides to die out, then it wont start for a while, then runs fine a day or two then die. i bought a scanner and these 9 codes came up. (its 4 cylinder, 5 speed.)

P0301 (cylinder 1 misfire) (generic code)
P1440 (EVAP system vent circuit malfunction) (manufacturer code)
P0443 (EvaPorative emission system purge control valve circuit) (generic code)
P0303 (cylinder 3 misfire) (generic code)
P0304 (cylinder 4 misfire) (generic code)
P0302 (cylinder 2 misfire) (generic code)
P0300 (random misfire) (generic code)
P0507 (idle air control system RPM higher than expected) (shows up 2 times) (generic code)

all codes show up in this order, i dont know where to start. what should i fix first? could one thing be the cause of the other codes? whats wrong? any help would be greatly appreciated. :D

any one knows how to help?????

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#2 ·
Holy cow. wish i could help you, but have no idea. maybe bump for some ideas lOl.... Welcome to the forums. I wanna say something with the spark plugs and wires?
 
#6 ·
Vapor lock from evap problem? When it dies removed the gas cap and try to restart car again. If it starts right up there is a venting issue. Bad gas ;water in gas also possible , add isopropyl alcohol , may be hard to find where you are, its gas line anti-freeze. Removes water quite well. Also try to check fuel pump pressure.
 
#7 ·
Plug fouling can cause misfires. I'd pull the plugs to look at them and if it has been a while since they were replaced, replace them. Plug wires also can cause misfires.

Once the misfires are corrected, look at the evap system. The purge control valve can be bad as well.
 
#8 · (Edited)
thats way to many missfires all at once dude, i am going to say that it sounds like your coil pack took a crap on you.

I would replace the coil pack first before doing anything else.
 
#9 ·
Might not be a coil pack. I might suspect it if 2 misfires (1, 3 or 2, 4) but not all of the cylundars. Since there are evap codes also, I first would look into fouled plugs or why the plugs fouled in the first place. Since the evap system vent system is malfunctioning, I would think that there is too much pressure in the fuel system, which can add pressure behind the injectors and possibly add too much fuel than needed (and possibly at the wrong time).
 
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