DIY Spark Plugs, as requested. (Pics inside) - Page 3 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #21 of 132 Old 21st January 2007, 03:53 AM
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Quote:
Originally Posted by gtobynj
Kudos guys, I am a happy amateur mechanic with my biggest triumph being the installation of a shortshifter into my M3 (ain't repeating that one again in a hurry), but this looks like more grief and aggravation than I can be bothered with.

How often do the plugs get replaced according to the service manual?
I'm not sure what folks have been working on previously, but these plugs are are really not that difficult. Couple of parts in the way, but no plenums, AC houses, alternators, etc...

I did mine at 60k along with my pre-cat O2 sensors.

I decided to skip the antisieze to avoid any possible misfire issues.

A
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post #22 of 132 Old 17th February 2007, 09:58 PM
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Quote:
Originally Posted by rdm190
My 01 BMW "User Manual" has two plugs in the back of the book under "Specs" a NGK type and a Bosch type. I can scan the page for you if you like
Has anyone decided to try out a little Hotter Plug ... i.e. Denso Iridium's ?

I do think a few members upgraded their Ignition Coils with Ignition Solutions Plasma Coils without really posting performance results ... If there were any.

In the Owner's Manual for the 2003 M5 (dated 2002), I could not find any mention for any type or brand of replacement Spark Plugs ... Not Bosch and Not NGK ... Nada !
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post #23 of 132 Old 17th February 2007, 10:13 PM
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Quote:
Originally Posted by gra8fuldd ed
Has anyone decided to try out a little Hotter Plug ... i.e. Denso Iridium's ?

I do think a few members upgraded their Ignition Coils with Ignition Solutions Plasma Coils without really posting performance results ... If there were any.

In the Owner's Manual for the 2003 M5 (dated 2002), I could not find any mention for any type or brand of replacement Spark Plugs ... Not Bosch and Not NGK ... Nada !

i wouldn't play with heat ranges, a hotter plug will possibly lead to detonation, etc. That said, i have used the Denso Irridium plugs, but used the "m5 spec" plug, so not hotter than the stock plugs. I noticed no difference in performance compared to a fresh set of plugs, and the dyno didn't see any difference either. I do also have the IS plasma coils. When my car was at dinan a year ago, steve dinan noticed them in my "parts pile" while my engine was torn down. He said "these really do make some extra power, we dyno'd about 5hp repeatedly, but they kept shorting out and frying the dme in my car. Looks like they got rid of the led's, so maybe that was the problem." The original IS plasma coils had led's on them that would blink each time the plug fired, guess to look cool. Mine didn't have that, and when i asked was told that they eliminated them, didn't say why though. I've had them for about 3 years without issues though.
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post #24 of 132 Old 20th February 2007, 08:37 PM
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Quote:
Originally Posted by mottati
i wouldn't play with heat ranges, a hotter plug will possibly lead to detonation, etc. That said, i have used the Denso Irridium plugs, but used the "m5 spec" plug, so not hotter than the stock plugs. I noticed no difference in performance compared to a fresh set of plugs, and the dyno didn't see any difference either. I do also have the IS plasma coils. When my car was at dinan a year ago, steve dinan noticed them in my "parts pile" while my engine was torn down. He said "these really do make some extra power, we dyno'd about 5hp repeatedly, but they kept shorting out and frying the dme in my car. Looks like they got rid of the led's, so maybe that was the problem." The original IS plasma coils had led's on them that would blink each time the plug fired, guess to look cool. Mine didn't have that, and when i asked was told that they eliminated them, didn't say why though. I've had them for about 3 years without issues though.
Mike
Mike:

Thanks for the information on the Plugs and Plasma Coils. Even if it's only 5rwhp ... My old Mottoe is: "Every Little Bit Helps !"
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post #25 of 132 Old 14th November 2007, 09:33 PM
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What a terrific post! Thanks for taking all the pictures and writing up what to expect. Having changed tons of plugs, I can say that this wasn't particularly complicated (compared to others), but it is always nice to have a writeup so you know what to expect!!!

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post #26 of 132 Old 7th December 2007, 09:14 AM
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A little tip: You don't need to remove the electrical connector from the coils. Just remove the couple of nuts that hold down the ground wires and then the 8 that hold the coils. Then just pull on each coil and flip or slide all 4 coils over as a unit. The driver's side coil closest to the firewall that is the most pain in the rear really isn't that bad either. Once you loosen the 2 nuts that hold the coil, pull on the head of the coil (used a VERY small pry bar and my hand due to limited space) just slide the coil/wire over. There's no need to remove it from the head as you can slip the spark plug socket/extension down to the spark plug. The tip to use electrical tape to secure the spark plug socket to the extension came in handy. Good luck...only took 2 hours.

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post #27 of 132 Old 9th December 2007, 03:55 AM
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Great helpful post!!

Excellent post! I just finished the job and what a difference. As Racer suggested, I just detached the ground wire and moved the coils away. I used a universal joint and a combination of 3/8" extensions. Without the universal joint it would have been a PITA I'm sure. It took me a little over 2 hours (no distractions).

I attached photos of the extensions, and the plugs. Numbers 1-4 are from the passenger side starting furthest from the cabin. Numbers 5-8 are from the driver's side, 5 being furthest from the cabin and 8 being the closest. Does anyone know why plugs 5-8 (driver's side) are in noticeably worse condition than 1-4? Plug 8 shows some strange whitish substance on it. Anyone know if it's cause for concern? Thanks again RDM!
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post #28 of 132 Old 9th December 2007, 04:46 AM
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Did this on Thursday. Pretty easy DIY and a good way to break the ice working on your M5. Leaving the coils attached to the wiring would be the easiest way to do the job. A long extension and a universal is a must. Only problem I had was that when I cleaned the cover gasket on the RH side, I must have pulled it and stretched it out. Didn't want to fit back into the groove. Put it in the freezer for 10 mins and it drew up just enough to get it to stay in place to put the cover back on.

Last edited by caspian65; 9th December 2007 at 04:49 AM.
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post #29 of 132 Old 9th December 2007, 05:53 AM
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From a wear perspective, yours seem pretty even and look a lot like mine.

You also have the exact same pattern of oxidation. I attribute it to a poor seal on the drivers side cover...

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post #30 of 132 Old 7th July 2008, 03:32 PM
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I'm in the process of doing this right now but ran into a small problem. I got all 4 plugs(driver side) in, but can't seem to get the coils to clip into the sparke pluge. I'm pressing down on the coil but it seems that it doesn't go down far enough. If I take the coil of the studs and push down it clips on the spark plug, but once I put the coil back over the two studs that hold it, I can't push them down enough to clip on.
Help Please

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