Does anybody have some tips/procedure on replacing the Ignition Wires? I've ordered a Bosch set, and I plan to do a writeup on the procedure.
I, along with some others, have had a problem in the past where the engine would sometimes start sputtering, and wouldn't stop until the engine was restarted. I read on mercedesshop.com that this was a common problem on the 3.2L engine (ML320, S320, etc), and was due to lower quality ignition wires that MB got from their supplier, which can degrade faster than usual.
So I ordered a new set of Bosch wires from www.thepartsbin.com , which was the lowest price I could find around ($60.01 usd for the set). Now if someone has a procedure or some tips, I would greatly appreciate it! I will take pics of the procedure for others to see.
Vehicle: SEC 600 COUPE (RHD) One of the chosen few.
Location: Leicester UK
Posts: 1,358
RE: Replacing Ignition Wires
I have posted some diagrams on my gallery for you to look at , I think i would advise thus,
Remove 44-32. lift all leads from plugs, if the leads do not have any number rings on them get paper tape=masking tape and mark each one, starting from the front 1-6 next disconnect 95+,so that all leads are free from any thing holding them to the engine,
Coffe break, next remove HT lead from center of cap,and tuck out of way, now undo the three allen key bolts that hold distrib cap on, mark cap with tape so we dont get confused, remove whole thing from engine bay, have cold beer, inspect dizzy cap,Hope you dont have to buy new one, Lay out new leads on flat surface now you can replace leads one at a time, comparing the lengths and marking them with tape again, order 1-6, [;)]another cold beer ,now check rotor to make shure its ok , rub all spark surfaces with an erasor rubber, coarse type, to clean them, replace dizzy cap and tighten , replace HT lead, position leads and 95+ push all leads firmly home replace 32, then 44 , startmotor. do not rev listen for any misfire, If everything sounds ok wash up, enjoy!
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Vehicle: SEC 600 COUPE (RHD) One of the chosen few.
Location: Leicester UK
Posts: 1,358
RE: Replacing Ignition Wires
Just had to do exactly this on my right side to replace dizzy cap, what a job, should say that you need to remove the leads at the cap as well, on mine not possible to get to bottom allen bolt without doing that...
what a mess just a little iregular misfire , but when i took the distrib cap off - well i wonder how the mill went at all really
I finished installing the Bosch Ignition Wires on the S320 engine. It turns out, if you've ever changed the spark plugs, you've done 95% of the job of changing the wires. The inline 6 motor uses "Direct Ignition" where there are 3 coil packs, each handling 2 cylinders, mounted directly above 3 of the spark plugs. The ignition wires route from one terminal on the coil pack to another cylinder's sparkplug. Changing the ignition wires took about the same time as changing the sparkplugs (30 minutes)
The Bosch ignition wires have an updated design, where the wire doesn't have to "bend" as much. See attached pic.
Procedure:
1) Get air intake out of the way (see my prev post for pics; replacing sparkplugs).
2) Remove 7 allenbolts holding plastic cover in place
3) For each of the 3 coil packs, lift it off the sparkplug, pull the boot off, put the new boot on, and push it back onto the sparkplug. Before putting the new boot on, you should smear some diaelectric grease on both ends of the boot (came with the wire set).
4) For the other 3 sparkplugs, pull the wire off the sparkplug, loosen it from the plastic guides, and unplug it from the corresponding coil pack. For the new wire, put some diaelectric grease on the ends and plug it. Remember how the original wires were routed through the plastic guides.
BTW, I measured the resistance of my original wires to be:
Short Wire: 1669 ohm
Long Wire 1: 1932 ohm
Long Wire 2: 1746 ohm
These values were read using a Fluke Multimeter in the lab at my work. However, I cannot find any reference as to what values are considered acceptable?
How did you pull the old ignition wires from the coil? pure force? or is there a trick? I tried pulling the wire but couldn't. Should I pull harder?
Thanks[:(]
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