Does a 3.9 have a govenor at 3400 rpm? - Page 2 - Defender Source
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  #21  
Old November 22nd, 2006, 12:23 AM
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Chris Davis
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Sometimes at specific RPM's, if the zeener diodes in the rectifier circuit of the alternator has failed, it will leach A/C current into your wiring causing false trips on the injection system. Mine was at 2700 RPM, but I have heard of other rpm's affecting it.
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  #22  
Old November 22nd, 2006, 03:49 PM
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I am kinda inclined at this point to believe a sensor as well but without a code I have no place to start. I have still not found the issue. Still looking....
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  #23  
Old January 11th, 2007, 10:12 AM
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Well, I upgrade the the distributer and coil to MSD per several recommendations. The D is phenomenally stronger running now but still cuts out completely at 3400 rpm. I am running out of ideas at this point. It seems to have a lot of power at 3000 rpm but stumbles and will not surpass 3400 rpm under any circumstances.

Clogged cats would cause an over heating issue correct? I have none and the D only has 45k miles on it.

I have been unable to locate a fuel pressure gage that will fit the line at the filter so I don't see how I can check the pump. I replaced the fuel regulator with no obvious effect.

Any ideas? This is driving me crazy. It will not reach the speed limit on the interstate due to this, forget passing anything besides grandma on a cellphone.
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  #24  
Old January 16th, 2007, 11:23 PM
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Angry

oops
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  #25  
Old January 17th, 2007, 12:03 AM
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Doug Walker
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Anyone know if there is a 'limp home' mode in the 14CUX ECU?

Doug W.
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  #26  
Old January 17th, 2007, 10:45 AM
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Loic Fabro
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If the 14CUX ECU is the stock 3.9L ECU, then yes. I would assume that any ECU would have a limp mode in case of sensor failure.
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