LFX Spark plugs, who's done it?? - Chevy Impala Forums
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post #1 of (permalink) Old 03-21-2015, 11:42 AM Thread Starter
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LFX Spark plugs, who's done it??

I was looking at the back ones and I hope that the intake doesn't need to come off to replace them....

What have you guys seen out there? The fronts are so easy and accessible they could be done by a kid!
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post #2 of (permalink) Old 03-21-2015, 01:32 PM
 
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Come on, it wouldn't be any fun if you didn't have to remove the upper intake manifold
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post #3 of (permalink) Old 03-23-2015, 07:55 AM
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I'm interested in this too. Do you really have to remove the UIM or not?
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post #4 of (permalink) Old 03-23-2015, 08:05 AM
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Not sure if its the same with the LFX as the older models but the older models you have to support the engine from the bottom with a block of wood and a jack or the top with a cherry picker and remove the dog bones before rocking the engine forward to get to the back plugs, Again not sure about the 3.6.
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post #5 of (permalink) Old 03-23-2015, 08:38 AM
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Have you looked on you tube?
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post #6 of (permalink) Old 03-23-2015, 08:47 AM
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I does not look fun >>> https://www.youtube.com/watch?v=-P7iHyZHnls

2015 Chevy Impala Limited 3.6 - 2001 Chevy Impala 3.4
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post #7 of (permalink) Old 03-23-2015, 09:18 AM
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The car in the video is a 3.5l, not a 3.6l. Not sure if the 3.6l is any easier though!

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post #8 of (permalink) Old 03-23-2015, 09:28 AM
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I looked at mineand it doesnt appear the manifold will have to come off. Might be a weird angle to work from, but it doesnt look that bad.
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post #9 of (permalink) Old 03-28-2015, 09:02 PM
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Plugs?

I bought the plugs, I am going to buy a new set of wires before I put in the plugs. I also bought a really long spark plug socket that has a magnet in it. It is supposed to be good for getting the plugs in the back of an Impala 3.5. Or at least I hope so! The videos I watched look like it's not too terrible to get to those back plugs. I may give it a try in a month or so. Only have 63,000 on the car.
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post #10 of (permalink) Old 03-29-2015, 05:51 AM
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To get to the back plugs your going to have to remove the intake or at least loosen the bolts, cylinder #1 doesn't need the intake removed as you can sneak the coil out but cylinders #3 and #5 coils will hit the intake and won't come out

Removing the intake honestly isn't that hard at all, it's 8 bolts and you also have to remove the bolts from the power steering reservoir too. Other then that it's just the vacuum hoses. It would be best to pick up new intake gaskets from the dealer too along with the torque specs as there's a pattern to follow rebolting the intake together, the gaskets are cheap too.

You'll get to see how clean your intake valves are too doing this, good luck.

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post #11 of (permalink) Old 04-06-2015, 12:02 PM
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Thanks a good one!

Watched many videos and there are some different methods of getting to the rear plugs, but anyone who tears the engine apart to get to the rear plugs is either joking or making a joke or doesn't know what he is doing.
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post #12 of (permalink) Old 04-06-2015, 12:25 PM
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I did my 3.9, and just pulled the coil and metal plat off the back of the engine, didn't have any issues once that was done. I had plenty of space to work, and I needed it since I don't think the plugs were changed in a very long time since they had a coat of rust on the metal.
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post #13 of (permalink) Old 04-06-2015, 04:49 PM
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I changed the plugs on my 3.5 and all I had to do was remove the coil and I didn't have any problems with it. I didn't have to remove any other parts or anything but the angle to get to them is awkward but you can get to the plugs. It also helps if you have smaller hands.

I also had looked up some videos on youtube and they all suggested removing the engine mounts and pulling the engine forward with a ratchet strap or something and let me tell you, that is an inefficient way of changing them since the coil comes off fairly easily
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post #14 of (permalink) Old 04-06-2015, 05:15 PM
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The ratcheting the motor forward worked great when I had my 2001. Not so much on my 2008. The metal plate is 2 nuts and 2 bolts, only takes a minute or two to remove them, I just let it hang by the wires. Makes it so you can see what you are doing down there.
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post #15 of (permalink) Old 04-06-2015, 11:27 PM
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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.

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