2009 4.6 Replaced Spark Plugs

[ASHDUMP]

Bought plugs from the dealership at $11.XX each and hired a local mechanic to install them. I helped and watched mostly but he had to take all the plastic off the front along with the air filter box. He had all the right tools and it took him 2hrs.

A Hyundai shop might do it quicker but I was only charged $60 bucks for the work.

So all in at around $155.

The plugs with 100K on them looked dirty however still in tact. They did look like they needed to be replaced.

Will spark plugs make the car run better? for some reason I feel like my car is riding better than ever before....

Placebo affect?

 

[Big_tugg]

yes they will. Is that all you replaced? Spark plug wires or other ignition stuff wasn't replace?

 

[ShadowZ]

The coil packs on each cylinder do not need to be replaced unless they fail completely.

 

[Big_tugg]

The coil packs on each cylinder do not need to be replaced unless they fail completely.

Ok, so that leaves spark plugs and wires

 

[scottdk]

Nice work ASH, that's cheap. Now your good for another 100,000 miles

Did you take notice of the individual coil-on-plug ignition? I haven't really looked at the ignition system in detail yet, but I'm guessing this is the style ignition the 4.6 has. Makes more sense than using coil packs which are expensive to replace, because if it fails the whole coil pack needs replacement vs. if 1 single coil fails, only 1 part needs to be replaced.

 

[ASHDUMP]

Nice work ASH, that's cheap. Now your good for another 100,000 miles

Did you take notice of the individual coil-on-plug ignition? I haven't really looked at the ignition system in detail yet, but I'm guessing this is the style ignition the 4.6 has. Makes more sense than using coil packs which are expensive to replace, because if it fails the whole coil pack needs replacement vs. if 1 single coil fails, only 1 part needs to be replaced.

I did see each coil (pack?). They were long grey tubular pieces of plastic that had a grey rubber boot on the end. Mine did not show any burn marks or wear and were intact.

I'm glad the plugs are changed.... now if I could only find some solid information about the transmission fluid. Some people are changing it and some are not. The dealer near me wants $800+ which is stupid.

Some people here on this forum said they had gotten it done for around $300. If it was $300 I would do it... $800 is a little steep especially if Hyundai doesn't recommend it.

 

[scottdk]

I did see each coil (pack?). They were long grey tubular pieces of plastic that had a grey rubber boot on the end. Mine did not show any burn marks or wear and were intact.

I'm glad the plugs are changed.... now if I could only find some solid information about the transmission fluid. Some people are changing it and some are not. The dealer near me wants $800+ which is stupid.

Some people here on this forum said they had gotten it done for around $300. If it was $300 I would do it... $800 is a little steep especially if Hyundai doesn't recommend it.

Thanks for the info. What you describe is an individual coil (coil-on-plug, not packs) for each spark plug. This is a good thing, plus easy to change plugs.

Did you every try calling up a indi shop to get a tranny fluid quote?

 

[ASHDUMP]

Thanks for the info. What you describe is an individual coil (coil-on-plug, not packs) for each spark plug. This is a good thing, plus easy to change plugs.

Did you every try calling up a indi shop to get a tranny fluid quote?

I haven't yet... I think I will in the coming weeks. I'm a little reluctant to use any other brand tranny fluid other than Hyundai though.

I do sometimes feel like there is a little slack in my transmission. For instance, when I'm cruising highway speeds (say 70mph); if I let go of the peddle and let the car wind down to 60mph, then press on the gas peddle to resume speed there is a "jerk" feeling.

My car has been doing this for as long as I can remember... not sure if its by design but I always notice it. Almost like there is slack in the linkage then it catches...

 

[ShadowZ]

no wires. just plugs. If you need to replace the wires that go to the coil pack you probably have a whole mess of problems you do not know about.

 

[jchao]

Just changed mine over the weekend.
My car has 58,000 miles and would never wait the 100,000 to change them.
The old ones looked clean, there were 3 or 4 that the threads were a little rusty.
I did not remove the air box, just the top and filter but did unscrewed the plastic wiring duct on each of the valve covers.
Luckily, I have an abundance of different ratchets and extensions, not easy to get to the plugs.
It took me about 2 hours to complete job.
Spent 20 minutes looking for a screw I dropped.
I am also looking into changing the transmission oil.
Cannot believe they say 100,000 miles before changing and 800.00 to change it.

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[Mark_888]

I am also looking into changing the transmission oil.
Cannot believe they say 100,000 miles before changing and 800.00 to change it.

Synthetic transmission fluid apparently has a very long life under normal circumstances.

 

[baltojeff]

I know I am drifting into a subtopic here, but your 2009 has the same transmission as my 2011 4.6. It is a ZF 6HP26. The fluid recommended by the transmission manufacturer is LifeGuard6. The best priced option I've been able to find is from the California Transmission Supply Company that sells a kit that includes a new pan, gasket, filler plug and 6 quarts of LifeGuard6. You may want to pick up new pan bolts as well just in case. Replacing everything is not a bad idea, or just a few in case. Regardless, the fluid is certainly better than the Hyundai option.

However, if you have a shop that will do a true fluid replacement, you are likely to need about twice the capacity to ensure a complete fluid exchange. CTSC has LifeGuard6 at under $20 a quart, or 12 for $205.

Since ZF recommends replacement at no more than 60k miles, it was the key reason for me thinking about doing it.

 

[g_622874]

As I follow up, I did replace my spark plugs in my 2011 4.6, and it went relatively uneventfully. I'd recommend getting a "swivel" type socket extension as the angles to accessing the plugs get tricky on a few of them. You'll also need to unscrew the wiring harness on the driver's side to get to two of them. The one issue I had was getting access to the (I think) #8 plug (driver's side, back by firewall).

There appears to be a bracket blocking the access to the plug that is attached to the back of the block somewhere, but I can't get to the location to loosen / remove it. Anyone have some steps / clues / photos on what to do? At the moment, I have 7 new and 1 old plug due to this. Thanks.

 

[homeofstone]

Have transmission fluid changed and the pan/filter on the german ZF transmission which is what is in the 4.6 Genesis. The transmission will last way beyond 200,000 miles if fluid/filter is changed. Its the same transmission that is in some BMW's , Bentley's Jaguars and other high end cars.

 

[Samantha_Genesis]

As I follow up, I did replace my spark plugs in my 2011 4.6, and it went relatively uneventfully. I'd recommend getting a "swivel" type socket extension as the angles to accessing the plugs get tricky on a few of them. You'll also need to unscrew the wiring harness on the driver's side to get to two of them. The one issue I had was getting access to the (I think) #8 plug (driver's side, back by firewall).

There appears to be a bracket blocking the access to the plug that is attached to the back of the block somewhere, but I can't get to the location to loosen / remove it. Anyone have some steps / clues / photos on what to do? At the moment, I have 7 new and 1 old plug due to this. Thanks.

I am currently in the process of changing my plugs and number 8 is a ******. I am still trying to figure how to get it out. There is a metal bracket that connects to the engine and the ignition harness (Not sure what else to call it). The bracket is shaped like a Z almost and you should see the bolt just to the right plug 8 near the block. That is a 10mm bolt like the rest and will come out and let you remove the bracket. I hope this answers your question.

 

[Big shot tazzo]

I have a 2009 genesis 4.6 118,00 on her I need to change the plugs but not sure as to which ones to buy . Any idea on brand I should use . Hyundai wants wayyyyyyy too much

 

[edizzle89]

I have a 2009 genesis 4.6 118,00 on her I need to change the plugs but not sure as to which ones to buy . Any idea on brand I should use . Hyundai wants wayyyyyyy too much

NGK 4469 plugs gapped to .040-.044"

 

[Samantha_Genesis]

I have a 2009 genesis 4.6 118,00 on her I need to change the plugs but not sure as to which ones to buy . Any idea on brand I should use . Hyundai wants wayyyyyyy too much

Stick with the NGK IRIDIUM plugs they are going to run from 9.99 to 15.99 for the plug. I just changed mine and they work fine. I was about to purchase online from Advance Auto Parts and use a few deals and got the set for around 52.00. Mind you I had to go to one store and then another to get them. Good luck.

 

[Big shot tazzo]

NGK 4469 plugs gapped to .040-.044"

Thanks .. This car is worth every penny

 

[Big shot tazzo]

Stick with the NGK IRIDIUM plugs they are going to run from 9.99 to 15.99 for the plug. I just changed mine and they work fine. I was about to purchase online from Advance Auto Parts and use a few deals and got the set for around 52.00. Mind you I had to go to one store and then another to get them. Good luck.

Thanks for the Feed back