Ignition Coils 2009 2.4l - Hyundai Forums : Hyundai Forum
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post #1 of 8 (permalink) Old 03-25-2019, 10:03 AM Thread Starter
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Ignition Coils 2009 2.4l

Hello all! I have a 2009 Hyundai Sonata with the 2.4l and I am wanting to replace the ignition coils. I know that Denso is the OEM manufacturer for the spark plugs and ignition coils. I'm going to order them from Rock Auto and the Denso part number they have listed is DENSO 6738311 {#273002G000, 273003F100}. Is this the proper part number I need?

I'm confident I know how to replace the coilss, it seems like a very easy job. I know to disconnect the battery before starting the work. I've seen people say to put silicone paste in the ends of the coils to help with weather penetration. I may have the wrong paste name but is that something I should do? I replaced the spark plugs about a year ago and that just seems like it's going to be messy.
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post #2 of 8 (permalink) Old 03-25-2019, 12:40 PM
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What makes you think the coils are bad?

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post #3 of 8 (permalink) Old 03-27-2019, 12:17 AM Thread Starter
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I don't think there is anything wrong with them. But my car seems to have a rough idle and I'm trying to solve it. Now it sounds like I'm about to bring out the parts cannon. I've got no codes, air filter is clean and the throttle body was cleaned while working on another issue.
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post #4 of 8 (permalink) Old 03-27-2019, 12:52 AM
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Clean the throttle body first and see how that does.

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post #5 of 8 (permalink) Old 03-27-2019, 12:58 AM Thread Starter
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What's the basic procedure for this? Disconnect the battery, remove the air assembly, unplug the TB, remove the 4 bolts, pull it off and then use a cleaner on it? What cleaner should I use? I've heard not to move the flap in the throttle body as it could get damaged.
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post #6 of 8 (permalink) Old 03-27-2019, 08:06 AM
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Use carb cleaner. Take it apart and clean it so it looks like new.

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post #7 of 8 (permalink) Old 03-27-2019, 09:42 AM Thread Starter
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I will do it Saturday providing the rain stays away. The throttle body was supposedly cleaned a while back but I never saw it on the invoice.
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post #8 of 8 (permalink) Old 03-28-2019, 03:07 PM Thread Starter
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I had some spare time today and attempted to clean it. I was not able to disconnect the electrical connector no matter what I tried. I ended up spraying it down and cleaning what I could. I cleaned the battery terminals while it was evaporating. Put it all back together and the car did have some trouble starting but it got going. It seems to be running better. But, if I can somehow get the connector off, I'll take it off and do some more cleaning.
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