Need advice: One of my spark plugs is "gummy" (see picture) - BMW 3-Series (E90 E92) Forum

kcornwell · 10-04-2012, 09:36 AM

My mechanic said these were the original spark plugs with 63,000 miles on the car. Should I be worried about the gummy spark plug?

Brian_TII · 10-04-2012, 12:26 PM

I haven't changed mine yet on my e90 but those look about right to me for every other car I've worked on. I don't see a problem. Did your mechanic mention anything bad about them?

MaximusJ · 10-04-2012, 12:38 PM

It would be the right time to do it before the misfires happens. Bad plugs can wear out your coils. WAY cheaper to replace the plugs then the coils.

kcornwell · 10-05-2012, 11:00 AM

Quote:

Originally Posted by MaximusJ

It would be the right time to do it before the misfires happens. Bad plugs can wear out your coils. WAY cheaper to replace the plugs then the coils.

Funny you say that. I had to get a coil replaced. I am unsure if the gummy plug is the same as the coil.

Mechanic was not worried about the gummy plug.

Brian_TII · 10-05-2012, 11:21 AM

Could also have been the other way around... Bad coil caused build up on the plug. Either way I don't think you have anything to worry about.

Efthreeoh · 10-06-2012, 07:29 AM

Which one is "gummy"?

Phil325i · 10-06-2012, 09:17 AM

Quote:

Originally Posted by Efthreeoh

Which one is "gummy"?

I think the OP means the last one in the row (bottom of the picture). Look at the threads...

kcornwell · 10-09-2012, 09:19 AM

Thanks guys for the prompt responses!!

micah_675 · 10-09-2012, 08:44 PM

Black is oil burning/residue on your spark plugs. The brown/whitish is normal. See this as a guide for what your plugs are telling you about your motor.....

http://www.mudinmyblood.net/forum/im...park_plugs.jpg

More than likely the plug that is fouled black, is from oil dripping onto the top of the plug and slowly seeping through. This will cause oil fouling on your plug and on the contact. It was probably the plug right next to your 710 cap.

10-04-2012, 09:36 AM	#1
kcornwell New Member Drives: 2006 E90 330i Join Date: Sep 2012 Location: Destin FL Posts: 10 iTrader: (0)	Need advice: One of my spark plugs is "gummy" (see picture) My mechanic said these were the original spark plugs with 63,000 miles on the car. Should I be worried about the gummy spark plug? Attached Images
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10-04-2012, 12:38 PM	#3
MaximusJ Colonel Drives: 325i 2006 Join Date: Jul 2010 Location: Quebec, Canada Posts: 2,097 iTrader: (19) Garage List '06 E90 [3.72]	It would be the right time to do it before the misfires happens. Bad plugs can wear out your coils. WAY cheaper to replace the plugs then the coils. __________________ NinjaBlack '06 E90 BMW Performance & Active Autowerke inside My Picture gallery

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10-04-2012, 12:26 PM	#2
Brian_TII Private First Class Drives: 06 e90 330i 6spd Join Date: Aug 2010 Location: Atlanta, GA Posts: 191 iTrader: (0)	I haven't changed mine yet on my e90 but those look about right to me for every other car I've worked on. I don't see a problem. Did your mechanic mention anything bad about them?

10-05-2012, 11:21 AM	#5
Brian_TII Private First Class Drives: 06 e90 330i 6spd Join Date: Aug 2010 Location: Atlanta, GA Posts: 191 iTrader: (0)	Could also have been the other way around... Bad coil caused build up on the plug. Either way I don't think you have anything to worry about.

10-06-2012, 07:29 AM	#6
Efthreeoh Captain Drives: E90 Join Date: May 2012 Location: MARLAND Posts: 878 iTrader: (0)	Which one is "gummy"?

10-09-2012, 09:19 AM	#8
kcornwell New Member Drives: 2006 E90 330i Join Date: Sep 2012 Location: Destin FL Posts: 10 iTrader: (0)	Thanks guys for the prompt responses!!

10-09-2012, 08:44 PM	#9
micah_675 Second Lieutenant Drives: 2006 325i (US Spec) Join Date: Sep 2010 Location: Germany Posts: 253 iTrader: (0)	Black is oil burning/residue on your spark plugs. The brown/whitish is normal. See this as a guide for what your plugs are telling you about your motor..... http://www.mudinmyblood.net/forum/im...park_plugs.jpg More than likely the plug that is fouled black, is from oil dripping onto the top of the plug and slowly seeping through. This will cause oil fouling on your plug and on the contact. It was probably the plug right next to your 710 cap.