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Pulsing Power Loss At Driving Speed 200 1989

posted by  cgilmore on  Sun Aug 30 21:19 CST 2009
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last visit: Fri Apr 4 16:22 CST 2014
[RELATED]

Hello Everyone:

This is my first post... hope it is not too lacking of info.

My 89 244 has just started this odd, what I would call a pulsing at driving speed . What happens is at 30+ mph, the engine speed drops from normal to about half of normal RPM and then returns to normal RPM - so I lose power -hard to drive too.
This occurs at a very even timing - about once per second for the full cycle - Normal RPM - Half Normal RPM - Normal RPM (in one second). So, that's why I call it pulsing since it is so precise in it's timing.
What I am trying to say is about once per second the RPM level falls and returns to normal.
This does not occur at idle
I can shut the car off for a few moments and then drive it and the problem goes away. It can happen to the car cold or hot, at anytime , no relation to heat.
I disconnected the AMM and the problem went away , but poor start off acceleration . Left the AMM unplugged a day and the problem did not return. Plugged the AMM in and it took 2 days for the problem to return.
Also my idle speed is higher than normal at about 900-1000 RPM.
I don't get it.

Any help would be much appreciated.





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