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#2
12-27-2004, 12:28 PM
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Start at the beginning
Spark plug change is easy but without any experience you could damage something. I would practice on another vehicle. If you get the manual and study it you could do it. Do you have any automotive experience?
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Steve 1985 Mercedes 500SL Euro (Gray market) 1995 BMW 520i Euro (Gray market) 1992 BMW 525it Wagon 1994 Honda Del Sol Si 
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#3
12-28-2004, 06:15 PM
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I have been working on cars for years starting wih a 61 TR3. I am just unacquainted with this new car and would rather ask a dumb question than do something dumb. I haven't located a workshop manual yet. I am learning more every day from many sources including this fine web site. I appreciate your reply.
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#4
12-28-2004, 09:21 PM
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I think experience with older cars is helpful, but not enough - and I've worked on cars (and done fairly complex things for a driveway mechanic) for almost 30 years. The ignition wires are MUCH more frail than they once were (and are one heck of a lot more expensive to boot). Aluminum heads cross-thread unforgivingly, and IMHO, never-seez or similar is MANDATORY on plugs, silicone on spark plug/cap boots, as well as having good torque whenches - and using them. A wire-based gap measuring tool is inexpensive and I have personally seen demonstrated seemingly tiny changes in spark plug gaps and indexing produce amazing results on a dynamometer.
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86 560SL With homebrew first gear start! 85 380SL Daily Driver Project http://juliepalooza.8m.com/sl/mercedes.htm
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#5
04-03-2005, 10:24 PM
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Hey DGOFF,
I replaced my plugs on my SL320 as well. It is easy to do. Remove the air cleaner passover to the intake, the one that goes over the engine. The spark plugs are located under the plastic cover using an allen wrench. Underneath that plastic cover you will find 3 coil packs. First unplug the 3 harness connectors from the coils, I think I remember there are 3, remove the harness and put it over to the side above the intake manifold. The hardest thing is getting the plug boots loose, you grasp them really well and pull hard you can do it. The coil packs are done the same way, grasp each one underneath and pull it straight up. It looks like there is a screw in it, but that is not a screw, it is a ground pole, the coil pack has a spring in it where it attached to the ground pole. I kept all my wires connected to the coils and pulled the whole coil/plug wire assembley out of the center of the engine. Just use a 5/8 plug socket and put it down in the hole. Remove the plug and just be careful putting in the new plug, I got mine at the dealer to make sure I got the right ones. The car ran a bit better and performance was awesome. Be sure to check the 2 vacuum lines under there that control your EGR and make sure you put the coils right back in the same way. The allen screws that hold down the plastic cover also holds down the coils. So they have to be in right or the screws won't go back in, also don't try to start your engine without the cover in place. If you want me to send you pics let me know. Good luck! Also there is information on the 129 chassis and 104 motor on our website! Brian
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Brian W. Heitman www.MBCA.org/northtexas Join MBCA!!!
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