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noise when 2000rm

  #1  
Old 01-11-2007, 04:32 AM
Thread Starter
Join Date: Jan 2007
Posts: 1
Default noise when 2000rm

I have a 01 S80T6,with 20000miles. I like it very much as it gives me confidence to drive smoothly but excitingly.

However, there is always a erro message of Emission system service required with Check engine light. I did not pay a lot attention to it as I was told that it's not a critical problem.

The problem lasts for around 1 year and now, I hear a certain of noise when engine speed reachs 2000rm. i found this problem just right after the regular checking service of 20000miles. The nosie seems come from engine but it is not, because there is no this noise when I am kicking the accelerator pedal with shiftof N. The noise only happens when running on the road.

The noise sounds like a kind of sympathetic vibration, or a noise from a valve. it only happend when engine speed is around 1800rm-2200rm.

I have no any idea about the potential problem. could any expert can help me to give me advice?

Thanks in advance
 
  #2  
Old 01-12-2007, 10:00 PM
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Join Date: Sep 2004
Location: Orlando, Florida
Posts: 36,351
Default RE: noise when 2000rm

That means there is codes in the engine computer.
 
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