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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-16-2011, 11:12 AM
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bluebee bluebee is offline
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Does the M54 coil have a separate spark plug boot (or not)?

I asked two days ago (in post #35 over here) but there was no response so I ask separately in case it was lost in the details.

Simple question:
Q: Does the BMW E39 M54 engine have a separate spark plug boot or not?

I noticed in the misfire DIY the following admonishment:
Quote:
If the misfire moves, replace the spark plug boot
That never meant anything to me until I replaced my plugs; belatedly, I wished I had checked if that bottom part of the coil in the picture below is a separate spark plug boot (but I didn't know to test it at the time).

Is there a separate spark plug boot or not in the E39?

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  #2  
Old 04-16-2011, 11:13 AM
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champaign777 champaign777 is offline
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no
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  #3  
Old 04-16-2011, 11:15 AM
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Quote:
Originally Posted by champaign777 View Post
no
It sure 'looked' like it was one piece when I removed the coils; but Realoem lists it as two pieces (so I'm confused):
- Engine electrical system => Ignition system => Igtn. coil/sparkplug connector/sparkplug

But, realoem has been wrong in the past (all too often); and, the diagram does not look the same (it's only slightly different) as my photo shows above.

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Last edited by bluebee; 04-16-2011 at 11:25 AM.
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  #4  
Old 04-16-2011, 11:57 AM
bobdmac bobdmac is offline
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Since it appears you can buy the "spark plug socket" separately for $13.95, vs. $85.84 for the coil, I'd guess it's a separate piece.
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  #5  
Old 04-16-2011, 12:11 PM
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Fudman Fudman is offline
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Correct, the lower tubular section is a separate part from the coil itself. It is called the spark plug connnector. The bottom end of the connector that connects onto the top of the sparkplug has a rubber boot on it. This is the part that rotted out when I had oil accumulate in my spark plug well.
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Old 05-06-2011, 02:35 PM
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Thanks for the answers.

My hands must be too weak to pull the boot off because I tried and nothing budged.

Anyway, today someone else with an M54 also had trouble separating the boot from the coil so I don't feel so badly anymore:
- HOW DO I REPLACE THE BOOT ON THE Ignition Coil

Quote:
Originally Posted by moiz21 View Post
Pretty sure you just pull. If its the original boot it will be stuck on there pretty good. Just work at it.

Last edited by bluebee; 05-06-2011 at 02:36 PM.
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  #7  
Old 05-08-2011, 05:46 AM
Jimmys 530i Jimmys 530i is offline
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If you pull on it, it will come right off. Make sure not to punch yourself in the face when it comes off like I did.
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  #8  
Old 05-08-2011, 03:16 PM
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Quote:
Originally Posted by Jimmys 530i View Post
If you pull on it, it will come right off. Make sure not to punch yourself in the face when it comes off like I did.
They are very hard to come off. What I usually do is I punch myself in the face before I try to separate them, to get my adrenaline going. Then I pull on them and they come off in no time.

I tried the drumming on my chest method, by it didn't work well.

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  #9  
Old 05-08-2011, 11:37 PM
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Quote:
Originally Posted by MatWiz View Post
What I usually do is I punch myself in the face before I try to separate them


Apparently the some coil boots are removable while others are not ...
- HOW DO I REPLACE THE BOOT ON THE Ignition Coil

Quote:
Originally Posted by oembimmerparts View Post
If the car was built on or after 09/2002 [the boot is] part of the coil and can not be replaced separately.
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