Spark plug change GL550
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Newbie
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08 GL550
Spark plug change GL550
Hi, new to the forum and looking for some guidance. I'm getting ready to change the spark plugs in my 08 GL550 and looking for any advice or helpful tips/things to watch out for/things to avoid. Thanks.
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depending on operating conditions your interval should be 75-100k miles and from what i have seen 100k plugs look just fine.
Thread Starter
Newbie
Joined: Aug 2012
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08 GL550
It has 105k, I'm changing air filter, oil etc, and thought while I was in there do the recommended plug change as well. It looks like I just pull the coils off of the top of the plugs to replace. Anything to watch out for? What sort of gap is required?
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2008 R320 CDI, 2006 smart fortwo cabrio, 1983 240D, 1982 300SD, 1980 300SD
Plug gap is always set never need to change it unless you dropped them. It is a straight foward job, use a small amount of thread grease to keep the plugs from seizing.
MBWorld Fanatic!
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this.
also you are better off to unscrew the coils and maneuver them as needed then pull the plug wires off the plugs as you will have more leverage that way.
lastly, you might need a flex wrench extension for the plugs closest to the firewall depending on your dexterity and size of hands
Newbie
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From: San Francisco, CA
GL550
i have 57k getting a little misfire. should i look into changing plugs or it might be something else. vehicle is at dealership and the service advisor is hinting at that. not getting any codes.
any input is appreciated.
any input is appreciated.
Last edited by Samour; Apr 10, 2013 at 05:21 PM.
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Member
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2008 GL550
I am using the Bosch YR7MPP33. Will post the proper specs once I get the info.
Many new spark plug manufacturers advise against thread grease.
Last edited by kensiko; Nov 19, 2017 at 03:37 AM.
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2008 GL550
Prior to removing the coil, clean the top of the engine to ensure that no debris falls into the spark plug chamber.
Our car has an engine cover so the top of the engines are usually pretty clean.
Once you remove the coil, prior to removing the spark plug, look into the spark plug chamber to ensure that its clean.
If there is any debris or dirt in the chamber, blow it out prior to removing the spark plug. Otherwise that debris will literally fall into the engine once the spark plug is removed.
Our car has an engine cover so the top of the engines are usually pretty clean.
Once you remove the coil, prior to removing the spark plug, look into the spark plug chamber to ensure that its clean.
If there is any debris or dirt in the chamber, blow it out prior to removing the spark plug. Otherwise that debris will literally fall into the engine once the spark plug is removed.
