LFX Spark plugs, who's done it?? - Page 2 - Chevy Impala Forums
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post #16 of (permalink) Old 04-07-2015
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Originally Posted by fatrabbit View Post
Chrislind2, kd7ctv and tehhax- I hope you all know the original poster was asking about the LFX or the 3.6L DOHC found in all 2012+ impala, not the 3.5L and 3.9L. The push rod engines are simple to do a tune up on. You don't even need the W-body ratchet either though it does make life easier lol

The LFX is a little different though, the plastic intake is molded to cover over the rear bank and makes it impossible for you to clear out the cylinder #3 and #5 coil packs, you can snake out cylinder #1 coil pack though.

I guess the laugh is on you Chislind2 for not being able to read the post correctly, I do this for a living/work at a professional shop.
Yep and the factory service manual says to remove the manifold also.

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post #17 of (permalink) Old 04-07-2015
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Sorry fatrabbit

I was assuming things and that gets people in trouble. It's amazing how different the years and models can be. Being an old timer we used to work on cars that mainly only varied between manufacturers and an individual company rarely made changes that amounted to much unless they came out with a new model. I apologize for insinuating you did not know what you were talking about.
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post #18 of (permalink) Old 04-07-2015
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chrislind2- it's all good, no hard feelings lol

I miss 3.5/3.9 platform, for the most part pretty much everything on that motor is easy to get too and replace. The newer LFX engine is a tall/wide motor and it makes things more challenging to get too, when you change out the spark plugs your going to want to order the gasket set #126459 and that will come with the gasket for the spacer/intake gaskets/throttle body gasket. I paid $19.02 but that was with my discount, list price is $21.13.

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post #19 of (permalink) Old 04-09-2015
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I can't believe you have to do all of this to change the rear spark plugs.Another jewel in the crown for GM engineering.Its like the plastic shroud over the top of the engine.To remove it you have to take off the oil filler cap so junk can fall down in it as you take it off.The shroud fits over other removeable caps but not the one for oil.Oh,and I am referring to the 3.6L engine starting in 2012.
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post #20 of (permalink) Old 04-09-2015
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^ Leave it off....
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post #21 of (permalink) Old 04-09-2015
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It's job security, so maybe you won't want to do it and will take it to the dealer and pay them...lol
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post #22 of (permalink) Old 04-09-2015
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i look at the rear spark plugs there space to pull the coil and remove the spark plug whit out taking the intake twist and pull (that is not dirt that is pollen)
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post #23 of (permalink) Old 04-09-2015
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There's not room though, I already went though this with my 2012 Impala 4 months ago...

There's no way to pull out the coils without removing the intake, you can get the cylinder #1 coil out but you won't be able to snake out cylinder coils #3 and #5. The coils are long and go deep into the cylinder head, you have to pull them straight up to even be able to wiggle them out and that's why the intake must come off.

You also have to be mindful that the coils have a spring that reaches the spark plug and the last thing you want to risk is damaging the spring, it's much less of a headache to just remove the intake. It's 8 bolts right up top and and if I recall 3 quick connect hoses, it won't kill you lol

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post #24 of (permalink) Old 04-09-2015
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Well if you going to take the intake out anyway clean the valve
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post #25 of (permalink) Old 04-09-2015 Thread Starter
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Thanks for the replies gents.

The 3.5L and 3.9L w/ 4spd are complete and utter jokes compared to the LFX and 6spd transmission...trust me, I've had all three (2006, 2009, 2013). With E85, a K&N intake, Vmaxx spiral TB, and Magnaflow CB, my 0-60 is < 6 secs. A bigger joke than those two? The 3.4L turd in my old 2004.

Back to the plugs, taking the intake off won't be a problem, but finding torque sequence will cost me because you have to get a service manual. Haynes and all those guys only go up to 2011. I wouldn't mind taking it off, I actually want to so I can see what is going on there. I assume this is an air only intake and doesn't have liquid ports..

And thanks for the pictures, because that is what I was seeing with my eye. If you never have changed plugs on a DOHC engine, you would understand like fatrabbit said. They go very deep into the head.
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post #26 of (permalink) Old 04-09-2015
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According to alldata which is the same as the factory service manual, torque spec for the intake bolts are 25Nm or 18 Ft/Lbs. No more excuses

If you don't want to spend $200 for the printed factory manuals, alldatadiy.com has the same info on a subscription basis. I got a code for 2 years access for less than 15 bucks. Id be happy to give it to anyone that pms me. Best money on your car you'll ever spend for the diy'ers.

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post #27 of (permalink) Old 04-10-2015
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Just wanted to clear up some confusion about my last post. I've gotten some PM's asking for my own subscription to AllData. That wasn't what I was offering. I'm offering a coupon code for your own subscription for 2 years access for less than 15 bucks, which is an awesome deal and a must-have if you do your own work on your car! Thanks.


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post #28 of (permalink) Old 04-15-2015
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post #29 of (permalink) Old 04-16-2015
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I hate to muck up this thread with questions but, Instead of paying the shop damn near $400 to do plugs and wires, I'd love to be able to do it myself and save a bunch of money. So on the older 3.5s(2007) I DONT need to pull the engine forward? I should be able to get to the plugs without moving the engine forward?

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post #30 of (permalink) Old 04-16-2015
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Thats correct, I just did my 2010 Impala with the 3.5 and I only had to remove that plastic cover on top and you have to remove the coil block on the rear pass side by the alternator. There is 4 10mm bolts holding that on. take the plug wires off the coil block and disconnect the wire harness to it. ( wires and coil block are numbered so it wont get messed up ) If not make sure you label them.

You dont need a universal either,

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