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Old 05-15-2005, 05:07 PM
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Join Date: Feb 2005
Posts: 26
m104 coil pack removal


I have a 1993 300e with m104 engine. Today, I was trying to replace the spark plugs. I was able to replace 1,3,and 5. 2,4,6 are under the coil packs.

I have been unable to unscrew the single screw that is holding down the coil packs. I tried a 1/8" flat driver and it was still too big. Is there a special size screwdriver that I need to get or where I can it from? As a last resort, should I drill out the flat head screw since it seems to be really screwed on tight?


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Old 05-15-2005, 05:31 PM
Join Date: Feb 2005
Location: Bergen County NJ
Posts: 4
Believe it or not..

Believe it or not but all you have to do is wiggle the coil packs and they come right out. I have the same car and mine aren't screwed in. Infact i don't know why those screws are there. Just get a firm grip of the coil pack and wiggle gently. The coils should come right out.
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Old 05-15-2005, 08:11 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Do not screw around with those post .. they are the grounding post and do not have to be removed to lift the coils...
As stated , the coils lift right off of these post.
If you strip them in the head , you are in trouble.
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Old 05-15-2005, 08:15 PM
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Join Date: Feb 2005
Posts: 26
Moneypit, thanks.

They wiggled out like you said.

Have you had problems with emissions testing on your m104 engine in NJ? I have already failed twice. In another thread, a member said I should make sure my cats are sufficeintly hot prior to testing.

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