Ignition coil and spark plugs - request

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Feb 5, 2013 | 09:58 AM

#11

Trinity Autosport

Former Vendor

Joined: Dec 2007

Posts: 3,624

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From: Anaheim, CA

My Ride: F10 M5

Model Year: 2013

Glad you got it taken care of

Feb 5, 2013 | 11:58 AM

#12

pcy

Senior Members

Joined: Mar 2011

Posts: 1,198

Likes: 3

From: Boston

My Ride: '06 530i, '07 C280 4matic, '98 ML320

Quote:

Originally Posted by BimmerRules

Based on what my trusted mechanic friend ... he showed me the results - numbers of the coil in position 4 were far far higher than the other positions. He switched the coils between #4 and #1 and ran the tests to double-check; sure enough, now #1's results were out significantly erratic.

That's the right approach in diagnosis and confirmation of the root cause before replacing parts. Buy your friend a beer.

Feb 5, 2013 | 06:07 PM

#13

ETNav382

Senior Members

Joined: Dec 2009

Posts: 878

Likes: 0

From: Birmingham, AL

My Ride: 06 550i

Model Year: 06

Do you think this is a good idea for preventative/upcoming 100k maintenance? Also do these coils fit a 550? I'm asking because Amazon says they do not fit (I know fitment guides aren't always correct) and I want to make sure they do before I buy.

Is this the plug you guys were referring to? NGK (6441) ZFR6FIX-11 Iridium IX Spark Plug, Pack of 1 : Amazon.com : Automotive

Thanks in advance.

Feb 5, 2013 | 08:06 PM

#14

plowery21

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Joined: Aug 2012

Posts: 265

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From: Columbia, SC

My Ride: Alpine White 2010 535 M-Sport

Quote:

Originally Posted by BimmerRules

Based on what my trusted mechanic friend (who also works @ a BMW dealership) did, it looks you do need to hook up the car and run the tests to determine which one is having an issue. It took about 30 minutes and he showed me the results - numbers of the coil in position 4 were far far higher than the other positions. He switched the coils between #4 and #1 and ran the tests to double-check; sure enough, now #1's results were out significantly erratic.

I am sure more experienced members can chime in on alternate methods.

Plowery and Trinity - thanks for the feedback!

No prob Bimmer!..because I had to go back in for a bad plug, the service papers says they diagnosed the issue the same way as your friend..found a bad result cylinder, switched coils, and in my case had the same result for the same cylinder...therefore the plug was bad not the coil...FYI

Would be nice to have a BMW certified tech as a Friend