How can I fix the rough idle? - Hyundai Forums : Hyundai Forum
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#1 Old 10-17-2011, 01:55 AM
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bcworld
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How can I fix the rough idle?

I have 2005 elantra ve and I got rough idle stop for a while.
How can I fix it? Please help!

Last edited by someguy; 10-17-2011 at 02:43 PM. Reason: Changed post title to a question
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#2 Old 10-18-2011, 01:10 AM
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I don't know enough about this specific Elantra engine but you dont have any replies yet so this applies to any car. Several things to check are vacuum hoses, pcv valve, motor mounts, spark plugs, spark plug wires, air filter, maf sensor, fuel filter. If you are up to date on routine maintenance this will be easy, if not its probably time for a tuneup. While you are at it dump a bottle of Techron concentrate or Gumout regane in with your next tank of gas.

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#3 Old 10-18-2011, 01:56 AM
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Check for codes as a starting point.

Lots of things can cause rough idle, guessing can get expensive.
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#4 Old 10-18-2011, 03:57 PM
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Yeah throwing parts at the problem is never a good idea but a lot of my suggestions can be done for free

vacuum hoses - check for damage, loose connections, holes, collapse, cracks
spark plug wires - check for loose connection, physical signs of damage
spark plugs - check for fouled plugs, excessive deposits, bad gap
motor mount - check for worn bushings, loose bolts, broken metal
air filter - is it really dirty?
maf sensor - is it dirty?
pcv valve - is it clogged

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#5 Old 10-18-2011, 11:23 PM
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Spark plug were replaced a moth ago.
Air filter was replaced 2 moths ago.
Can I check Code without engine light on?
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#6 Old 10-19-2011, 12:45 AM
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Yes not all codes will turn on light. So there may be a code like cyclinder misfire etc that will point in the right direction.

Most common cause of rough idle on Elantra is TPS sensor ; second most probably intake manifold gasket. How many miles on car ?
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#7 Old 10-20-2011, 01:30 AM
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no code show on my code reader.
mileage is 178500.

thanks
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#8 Old 10-20-2011, 06:59 AM
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I have seen TPS sensors fail on cars without a code (my old Taurus to be exact) but never on a Hyundai.

Get a can of carb/throttle cleaner to check for intake manifold leak (common for your milage range and a fairly cheap fix). With the car running spray lightly around the seam where the intake manifold joins the block(right beside where the injectors are mounted). If the idle speeds up and smoothes out you have found the problem.

Another rough idle problem I only recently learned about is the OCV oil control valve screen getting dirty. Its a small metal round sensor at the front right side of the engine that can be unbolted; screen inside gets gummed up and can affect engine idle. There are threads on this forum about this issue. Good luck hope you find problem.
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#9 Old 10-28-2011, 12:49 AM
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Is there any different between carb cleaner and throttle cleaner?
I has splay some carb medic to clean inside of throttle. It shows no improvement.
I try to clean IACV could you help me to locate it please.
Thanks.
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#10 Old 10-30-2011, 01:11 AM
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Quote:
Originally Posted by bcworld View Post
Is there any different between carb cleaner and throttle cleaner?
I has splay some carb medic to clean inside of throttle. It shows no improvement.
I try to clean IACV could you help me to locate it please.
Thanks.
Today I got IACV clean the problem solved.
Any body can tell me. What is the function for the screw at the end for iAC value?
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