Spark plugs after many tuned miles

GeorgiaTech335coupe · 03-19-2010, 11:46 AM

I just had all 6 plugs changed out. 2 of the 6 had been recently replaced by BMW for cold start misfires, the other 4 were the original plugs. They have about 31k on them, and probably 20k tuned.

John at Precision Sport Industries in Winter Park, FL took great care of my car and got the job done quickly. They know their stuff over there and I highly recommend them to anyone in the Orlando area. I got to take a look at one of only a few twin supercharged M5s while I was there. That thing was awesome!!!

If you have been driving your car with a tune for a while, you definitely want to make sure you swap out the plugs. Do you think I could be losing any performance with these in?

beta17 · 03-19-2010, 11:54 AM

omg!!!

Syndicategt · 03-19-2010, 12:04 PM

They are not THAT bad for 31k miles.

borisivan · 03-19-2010, 12:07 PM

Quote:

Originally Posted by beta17

omg!!!

What are you omg about?

GeorgiaTech335coupe · 03-19-2010, 12:08 PM

For clarification, 2 of the plugs looked like the picture on the bottom left and the other 4 looked like the one on the bottom right.

GeorgiaTech335coupe · 03-19-2010, 12:10 PM

You can see the plugs didn't seem to have any fouling and wore down evenly. The gap was almost doubled over stock on the worn plugs though.

GeorgiaTech335coupe · 03-19-2010, 12:42 PM

Quote:

Originally Posted by Nick.CBR

Look fine to me for 31K and a lot of them tuned. VERY interesting on the gap though; didn't think it would be almost double. This is good info for people that may not understand why new plugs can fix misfire codes; double the gap means more juice to jump the gap and can get blown out easier.

Thanks for the pics!

Nick

It's kind of hard to tell from the pics, but the center electrode is shaped like a triangle now.

raceyBMW · 03-19-2010, 01:38 PM

One on the left still looks near perfect, one on the right definitely shows wear on the electrode and a much bigger gap...definitely could cause misfires.

Crimson92 · 03-19-2010, 01:42 PM

thats not bad actually

GeorgiaTech335coupe · 03-19-2010, 03:21 PM

Quote:

Originally Posted by raceyBMW

One on the left still looks near perfect, one on the right definitely shows wear on the electrode and a much bigger gap...definitely could cause misfires.

The one on the left only had about 1k miles on it. BMW had replaced 2 of my plugs not long ago.

JoeyFiasco · 03-19-2010, 03:42 PM

so as a general rule, after how many miles should we change the plugs if we are tuned?

Vudoo4u2 · 03-19-2010, 04:39 PM

10k

03-19-2010, 11:46 AM	#1
GeorgiaTech335coupe Lieutenant Colonel 81 Rep 1,883 Posts Drives: Black BMW 335i coupe Join Date: Mar 2007 Location: USA iTrader: (0)	Spark plugs after many tuned miles I just had all 6 plugs changed out. 2 of the 6 had been recently replaced by BMW for cold start misfires, the other 4 were the original plugs. They have about 31k on them, and probably 20k tuned. John at Precision Sport Industries in Winter Park, FL took great care of my car and got the job done quickly. They know their stuff over there and I highly recommend them to anyone in the Orlando area. I got to take a look at one of only a few twin supercharged M5s while I was there. That thing was awesome!!! If you have been driving your car with a tune for a while, you definitely want to make sure you swap out the plugs. Do you think I could be losing any performance with these in? Attached Images __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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03-19-2010, 11:54 AM	#2
beta17 Private First Class 20 Rep 168 Posts Drives: E92 335i Coupé M-Tech Join Date: Apr 2009 Location: Zurich iTrader: (1)	omg!!! __________________ STOCK
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03-19-2010, 12:04 PM	#3
Syndicategt Brigadier General 164 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	They are not THAT bad for 31k miles. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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03-19-2010, 12:08 PM	#5
GeorgiaTech335coupe Lieutenant Colonel 81 Rep 1,883 Posts Drives: Black BMW 335i coupe Join Date: Mar 2007 Location: USA iTrader: (0)	For clarification, 2 of the plugs looked like the picture on the bottom left and the other 4 looked like the one on the bottom right. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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03-19-2010, 12:10 PM	#6
GeorgiaTech335coupe Lieutenant Colonel 81 Rep 1,883 Posts Drives: Black BMW 335i coupe Join Date: Mar 2007 Location: USA iTrader: (0)	You can see the plugs didn't seem to have any fouling and wore down evenly. The gap was almost doubled over stock on the worn plugs though. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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03-19-2010, 01:38 PM	#8
raceyBMW king of the hills 112 Rep 2,923 Posts Drives: 2011 M3 w/ESS55, 2001 540i/6 Join Date: Dec 2006 Location: Arvada, CO iTrader: (1) Garage List 2001 BMW 540i/6 [8.17] 1994 530i [9.00] 2007 335i Coupe [8.37]	One on the left still looks near perfect, one on the right definitely shows wear on the electrode and a much bigger gap...definitely could cause misfires.
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03-19-2010, 03:42 PM	#11
JoeyFiasco Major 26 Rep 1,211 Posts Drives: '09 Coupe Join Date: Aug 2008 Location: P'boro, UK iTrader: (0)	so as a general rule, after how many miles should we change the plugs if we are tuned?
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03-19-2010, 04:39 PM	#12
Vudoo4u2 Night Sh1ft 471 Rep 3,079 Posts Drives: F95 X5MC LCI Join Date: Oct 2007 Location: It's bobsled time iTrader: (3) Garage List 2024 BMW X5M Compet ... [0.00]	10k __________________ "Your first 10,000 photographs are your worst.” ― Henri Cartier-Bresson
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