86 740 hit bump = loss of power

e777 · Post by **e777** » 25 Sep 2011, 13:55

Hello,

My 86 740 NT wagon has been doing something odd lately. I'll be driving at about 35mph and then occasionally, when I hid a bump in the road, I feel a sudden loss of power at which time I have observed the tach to suddenly drop to 0 before jumping right back to normal. The car has all new-ish ignition components, with the exception of the coil. Could this be ECU related?

Thanks,

Eric

lummert · Post by **lummert** » 25 Sep 2011, 14:03

Check the condition of the red wires connecting to the positive battery terminal.

e777 · Post by **e777** » 26 Sep 2011, 07:36

Thank you. I will check it out and let you know what happens.

Post by **jimmy57** » 26 Sep 2011, 12:21

Check the power stage (coil signal amplifier) connector on left fender behind and below the back of left headlamp.

e777 · Post by **e777** » 26 Sep 2011, 18:38

Thanks, jimmy 57. I checked the power stage and it was secure (although I probably should clean the connectors). What I did find, as our colleague suggested, was that the two bolts holding the positive battery cable to the connector clamp were quite loose. I tightened them and will see what happens. Thanks again to the both of you!

--Eric