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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Plug longevity running a tune



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      08-03-2013, 09:27 PM   #1
Iamstig335
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For those running a tune, what are you experiencing for mileage between spark plug replacement? I had mine done at the dealer 20k miles ago and just trying to gauge when I'll be needing new plugs.
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      08-03-2013, 09:39 PM   #2
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Others suggested 25k for the tune. My car had 19k when I put the tune and the plugs gave up on the first run.
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      08-03-2013, 10:06 PM   #3
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Depends on how much timing your tune is running, how hard you drive the car, and several other factors. I'm changing mine every 15-20,000 miles or if I miss. If you changed them 20,000 miles ago, I'd swap them out. It's not like it's expensive.
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      08-04-2013, 05:45 AM   #4
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Quote:
Originally Posted by E90Company
Depends on how much timing your tune is running, how hard you drive the car, and several other factors. I'm changing mine every 15-20,000 miles or if I miss. If you changed them 20,000 miles ago, I'd swap them out. It's not like it's expensive.
How about coil packs, are you noticing about the same 15-20k lifespan?
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      08-04-2013, 07:04 AM   #5
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Still on original coils 47k miles. I drive a 2007. Been tuned since 18k.
Also been running e85 for a year and meth about a year before that.
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      08-04-2013, 09:07 AM   #6
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My plugs only lasted about 14k on my FBO car running 60-70% E85 @ 21-22psi
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      08-04-2013, 09:10 AM   #7
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Changed mine when FBO at 13k and they really needed it.
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      08-04-2013, 09:58 AM   #8
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Quote:
Originally Posted by Iamstig335 View Post
How about coil packs, are you noticing about the same 15-20k lifespan?
I would say replace those as they go bad. If you wanted to replace them on an interval, you could probably do every 40-45k or so. They should (and will) last longer than plugs will. They don't wear as fast.
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      08-04-2013, 11:36 AM   #9
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Thanks all for the information. I already replaced the coil packs when I first installed my tune. Looks like its time for plugs since I recently had my intakes blasted clean.
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      08-04-2013, 11:42 AM   #10
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Quote:
Originally Posted by E90Company View Post
I would say replace those as they go bad. If you wanted to replace them on an interval, you could probably do every 40-45k or so. They should (and will) last longer than plugs will. They don't wear as fast.
+1 coil packs either work or misfire, replace them when they fail, not really worth the money to replace them before they start to have issues and even when one fails I would probably just replace it instead of a full set.

Plugs also depend a lot on the tune and they way you drive, my car is FBO lots of short trips in town driving, so I think mine are ready at 15k!
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      08-04-2013, 01:28 PM   #11
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My plugs go about every 15k on my Cobb stage 1+
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      08-04-2013, 08:04 PM   #12
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On a car that is ran hard I'd say every 10-15k or once a year.
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