Call it what you may, there are no wires under the coils and the boots are the connectors cover at the wires into the coil , not out.

Your post states that you verified no spark at 5..how did you verify that condition?

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A Dalton

I understand what you are saying; I researched the 'cylinder 5 misfire' issue at mbworld.org and benzworld.org before I ordered all the replacement parts that would be suspect for the condition. The failures seem to follow the pattern: 1. plugs, 2. plug 'wires' (the 3 wires and the 3 posts/boots under the coil) and 3. the coil itself. I only replaced the coil and post/boot related to cylinder 5.

As far as testing for spark, unplugged spark plug wire from cylinder #5's new spark plug, leaving that spark plug in place, and using old spark plug in wire with base grounded. No spark appeared. Reattached to new spark plug in cylinder #5 and then repeated the same test with cylinder 1 spark plug wire and got a spark.

Greatly appreciate the help.

Bill

< I only replaced the coil and post/boot related to cylinder 5.

>

Ok

Let me ask this, as i do not know what a" post boot" is.
Did you replace the plug connector under the coil that operates cyl 5 ?
Did you replace the plug wire going to #5 from the same coil?
Did you have the plug connector under the coil hooked uo when you tested for spark at 5 ?
You are aware that this is a series circuit that fires two plugs , in series?

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A Dalton

The post/boot is all I could think to call it because it looks like a 'post' and a spark plug boot combined. More basic: Rubberized sleeve with connectors on each end - one end connects to bottom of coil and the other the top of a spark plug.

To answer your questions:

Did you replace the plug connector under the coil that operates cyl 5 ?
B> Yes and the coil as well
Did you replace the plug wire going to #5 from the same coil?
B> Yes
Did you have the plug connector under the coil hooked uo when you tested for spark at 5 ?
B> Yes
You are aware that this is a series circuit that fires two plugs , in series?
B> Knew the 3 coils was different from what I'm accustomed to. So you are saying cylinder 2 and 5 fire simultaneously?

Of course ..it is a Waste Spark DIS system. They are in series and one fires on Event stroke and one fires on Waste stroke. That is how you can run 6 cylinders on 3 coils...they fire two cylinders at once, but b/c one is firing on the Exhaust stroke, it is a WASTED SPARK and means nothing.
My concern now is do you have fire at the plug under the coil...
A test is to lift that coil ad use a plug wire in place of the Plug Connector [ what you call post/boot] and see if that has spark.

But don't disconnect the other in series plug.

..or, you can swap the coil with another and see if the misfire moves with the coil.

If you have no spark under the coil along with 5, then you have a bad trigger circuit in the HFM control module or a broken sensor magnet on the flywheel. There are 3 segments on the FW, one for each coil.

test that plug under the coil.

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A Dalton

Ok. But like I said earlier, code that mechanic pulled said misfire on #5 and the car drives fairly well; reached 70 ok. 'shudder' in car from take off gets better as speed increases but never fully goes away.

Thanks again for the help. Not a lot of folks near me that knows the car well.

Which indicates possible ECU trigger/weak spark.
So.............. lets see what we have under the coil ..ok?

Unless you have a DSO Scope??????????


..and, do you have Plats ?

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A Dalton