What causes a plug to fail - BMW Luxury Touring Community
 
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post #1 of 8 Old Aug 17th, 2011, 11:27 am Thread Starter
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What causes a plug to fail

2000 LT - It was running a little rough this morning, and when I got to the highway, it wouldn't go over 70 MPH. I took it to Bob's BMW (Thanks for taking me right in) and they diagnosed it as a "fouled plug." They put in a new one and it's running fine again. Any ideas what could have caused that? Should I be worried?
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post #2 of 8 Old Aug 17th, 2011, 11:30 am
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Re: What causes a plug to fail

Too many things can cause this. If it does not return quickly then don't worry. Oil contamination, chunks of carbon, plug wire breaking down, age ...the list goes on.

John
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post #3 of 8 Old Aug 17th, 2011, 12:06 pm
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Re: What causes a plug to fail

When were the plugs last changed?
If one failed, others may too...

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post #4 of 8 Old Aug 17th, 2011, 12:51 pm
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Re: What causes a plug to fail

Keeping the RPM's low will eventually cause a fouled plug...Could the problem be your riding style ? Just wondering....

If you're not winding it up on a regular basis.. That could be all you need to do...

These bikes need to be spun up... They like it..

Ride it like you stole it..

John

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post #5 of 8 Old Aug 17th, 2011, 1:58 pm Thread Starter
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Re: What causes a plug to fail

Quote:
Originally Posted by zippy_gg
When were the plugs last changed?
If one failed, others may too...
It just had the 48,000 service, but that was before I bought it so I'm not sure if the plugs were changed. I'll keep an eye on it.
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post #6 of 8 Old Aug 17th, 2011, 1:59 pm Thread Starter
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Re: What causes a plug to fail

Quote:
Originally Posted by JPSpen
Keeping the RPM's low will eventually cause a fouled plug...Could the problem be your riding style ? Just wondering....

If you're not winding it up on a regular basis.. That could be all you need to do...

These bikes need to be spun up... They like it..

Ride it like you stole it..

John
Thanks for the tip. I'm coming off of cruisers so it's posible I'm not winding it up often enough. That's an easy fix though!
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post #7 of 8 Old Aug 17th, 2011, 9:11 pm
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Re: What causes a plug to fail

Quote:
Originally Posted by lfmn16
Thanks for the tip. I'm coming off of cruisers so it's posible I'm not winding it up often enough. That's an easy fix though!
Yeah next time you leave a red light that turns green and you are the lead dog - gentley roll forward in first gear and once the clutch is fully engaged roll the throttle on up to 8 grand and you will be doing 60 mph when you shift to second. (I don't do that every time but at least once a week).

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #8 of 8 Old Aug 17th, 2011, 11:24 pm
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Thumbs up Re: What causes a plug to fail

And keep the RPM up in the twisties. You will discover a whole new bike you didn't know you had!

Gilles & Kathy
BMWMOA# 154719
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For her I swam across the deepest ocean!
For her I walked through the largest desert!
And then she left me... She said I was never home!!!


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