With the engine running, but car sitting still, the trace looks good - no dropouts due to worn brushes, etc.. HOWEVER, while driving the frequency of the current ripple changes dramatically, at times to 1/8 the 'normal' frequency. When this happened, the engine did it's 'stutter' thing. Since the frequency is directly proportional to the pump speed, my initial thinking is that this is not normal. I can understand the speed varying slightly, but not to this degree.
Any input as to how normal this is or what might be at issue would be greatly appreciated. TIA
posted by 71.76.24...
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