Backfiring in Cat Conv? - BMW Luxury Touring Community
 
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post #1 of 3 Old May 12th, 2007, 12:33 am Thread Starter
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Backfiring in Cat Conv?

I just purchased a used K1200LTC with about 65,000 miles on it. The seller reports that he had a problem with fuel backfiring in the cat conv while the engine is cold. I am finding that it "backfires" or rattles, or SOMETHING not only when it is cold, but all the time...not only when I let off the gas, but while accelerating, particularly between 3000 and 4000 RPM. Anybody have a similar experience...and hopefully, solution???????
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post #2 of 3 Old May 12th, 2007, 5:44 am
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Quote:
Originally Posted by PilotPhil
I just purchased a used K1200LTC with about 65,000 miles on it. The seller reports that he had a problem with fuel backfiring in the cat conv while the engine is cold. I am finding that it "backfires" or rattles, or SOMETHING not only when it is cold, but all the time...not only when I let off the gas, but while accelerating, particularly between 3000 and 4000 RPM. Anybody have a similar experience...and hopefully, solution???????
Phil sounds like the cat conv broke free inside the collector. I had the same experience. You may note eratic idyl . A cheap fix is to remove exhaust and open up the collector from the top and remove the cat then reweld (stainless). I am not sure how the bike will run after removing the cat.You may lose some low to midrange power.

Pete Murray
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2014 RT
1973 R75/5
2002 LT 171 K Gone
2008 FJR 36 K Gone
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post #3 of 3 Old May 12th, 2007, 8:25 am Thread Starter
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Thanks, Pete. I have a neighbor who has the ability to weld stainless. That sounds like a good starting point. It doesn't seem to affect performance, but is very annoying, especially when on such a smooth running machine.
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