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E350 spark plugs change - STUCK, need help

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Old Mar 6, 2010 | 03:31 PM
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06 E350
E350 spark plugs change - STUCK, need help
Preparing for the spark plug change (80K) on my E350, I removed the torx screws that hold the ignition coil. Disconnected the electrical connector (ignition coil end) an am stuck at this point. Should I now pull hard on the coil itself, to remove it from the spark plug cavity? Some recommend using the 17mm open end offset wrench to remove the coil? where to position the wrench to aid in this procedure?
Please help, I don't know how to proceed next.
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Old Mar 6, 2010 | 08:21 PM
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03 E500 and Corvette
Originally Posted by jdupa
Preparing for the spark plug change (80K) on my E350, I removed the torx screws that hold the ignition coil. Disconnected the electrical connector (ignition coil end) an am stuck at this point. Should I now pull hard on the coil itself, to remove it from the spark plug cavity? Some recommend using the 17mm open end offset wrench to remove the coil? where to position the wrench to aid in this procedure?
Please help, I don't know how to proceed next.
Yours is an 06 mine is 03 and slightly different and I have changed all 16 plugs in my E500.

Here is what I would do. After you have it free exclusive of removing the plug boot assembly from the plug twist the boot just enough left and right to break the friction loose. Then I used a 17mm wrench at the top of the insulated metal part of the plug boot and popped off the plug boot. I would NOT pry on the plastic coil for fear of breaking it $$$$. Just remember mine is a bit different but I think yours will also come off if you rotate it enough to break the plug boot friction.
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Old Mar 6, 2010 | 08:35 PM
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gently pull on it
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Old Mar 6, 2010 | 11:31 PM
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06 E350
Thanks to all
Pulling on the coil and boot assembly (one part for this engine) did the trick, and it pops out from the spark plug cavity (really loud) No special tools required, unobstructed access, easiest spark plugs change ever. Made sure to torque to 23Nm.
Strangely, the passenger side plugs were the original BOSCH units, whereas drivers's side was populated with NGKs, hmm. Unless the previous owner replaced one side only?

Thanks again.
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Old Dec 7, 2010 | 01:06 PM
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jdupa, I will be changing my spark plugs (81k on my e350) in the next week or so as well and had a couple of questions:

1. How many plugs will I need to purchase? (6 I assume)
2. Will I need to change the spark plug wires as well?
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Old Dec 7, 2010 | 02:11 PM
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Originally Posted by gdinerio
jdupa, I will be changing my spark plugs (81k on my e350) in the next week or so as well and had a couple of questions:

1. How many plugs will I need to purchase? (6 I assume)
2. Will I need to change the spark plug wires as well?
2 / cylinder.

No unless you break one. They are each individual part numbers and expensive. Be sure to break the boot free by rotating BEFORE pulling up and breaking the wire.
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Old Dec 7, 2010 | 03:29 PM
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Thanks for the quick response Vettdvr, its very much appreciated.
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Old Jun 26, 2011 | 01:14 PM
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Originally Posted by vettdvr
2 / cylinder.

No unless you break one. They are each individual part numbers and expensive. Be sure to break the boot free by rotating BEFORE pulling up and breaking the wire.
The DOHC 3.5 motor uses 6 plugs while the SOHC 3.2 uses 12 plugs or 2 per cyl.
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Old Jun 27, 2011 | 03:46 PM
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Originally Posted by Dexion
The DOHC 3.5 motor uses 6 plugs while the SOHC 3.2 uses 12 plugs or 2 per cyl.
And the DOHC motor doesn't use spark plug wires.
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Old Jun 27, 2011 | 04:10 PM
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the e350 gasoline engine is a dohc motor?
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Old Jun 27, 2011 | 05:08 PM
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That's correct.
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Old Jun 27, 2011 | 09:24 PM
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Originally Posted by TheGreatOne45
the e350 gasoline engine is a dohc motor?
http://en.wikipedia.org/wiki/Mercedes-Benz_M272_engine
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