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engine loping

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Old Jun 18, 2013 | 10:16 PM
  #1  
1979 300i6's Avatar
1979 300i6
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Question engine loping

My 300 is loping only at idel and I cant figure out why, its strang because sometimes it runs fine I can drive it 20 miles and no loping but then out of the blue it will start loping to the point where I think its going to die at stop lights ect I was thinking it was a valcum leak but I cant find any, other then that it runs fine no hesitation or miss, any more questions just ask thanks
 
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Old Jun 18, 2013 | 10:33 PM
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fmc400
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I'd try to "catch it in the act" and get as much information as you can in the fault state. In particular, I'd check timing and throw a vacuum gauge on it during the time in which it's running poorly. I might even go so far as to remove the air horn from the carburetor and check the fuel level in the bowl.
 
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Old Jun 18, 2013 | 10:41 PM
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MikePacey
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From: New Carlisle, Ohio
Carb could be loading up. Did you spray carb cleaner on the gasketed surfaces to see if the idle raises? Has your fuel mileage suffered?
 
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Old Jun 21, 2013 | 04:53 PM
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Well today the engine was running like a top drove it to work, but on the way back just as I pulled it in the driveway it out of now where almost died I put the clutch in and sure enough she was a loping like mad, kind of odd right?
 
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