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Motor runs rough with tach wire hooked up
From my limited electrical knowledge, wouldn't the switch in the throttle
provide an out for the Ohm meter's current? Ed "Calif Bill" wrote in message ink.net... Pull the wire from tach and engine and check with an Ohm meter for partial shorts. Should be infinite resistance. Bill "Ed Barchetta" wrote in message om... This problem popped up after a trip to the mechanic and he suggested that it might take some time $$ to diagnose. Hopefully someone has seen this before. I've got a 1982 Mercruiser 140 (181) that developed a rough disposition after a few minutes on the water recently. It started 'coughing' at planing speed and then idled bad to the point of stalling, even back on the trailer. While the engine would be sputtering, the tach would show the opposite of what was going on, ie: when the engine would nearly stall the tach would jump up erratically and alternately nearly bottom out when the rpm's rose. I found that if I disconnected the tach connection on the coil, the engine idled and cruised normally. The wire goes from the coil, through the throttle/shifter and then to the tach. To eliminate (or verify) that the tach itself might be the problem, I disconnected it at it's end and reconnected the coil end. The rough engine returned immediately. Without tearing out the wiring, I'm guessing a short or disconnection in the throttle area but don't really know what to expect once I'm in there. Has anybody any suggestions or experience with such a problem? Thanks, Ed |
#2
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Motor runs rough with tach wire hooked up
The tach wire should only go through a connector block. There is no reason
for a switch in that line. The Neutral Switch is only to allow the starter's solenoid wire to be open when not in neutral. Bill "Ed Barchetta" wrote in message ... From my limited electrical knowledge, wouldn't the switch in the throttle provide an out for the Ohm meter's current? Ed "Calif Bill" wrote in message ink.net... Pull the wire from tach and engine and check with an Ohm meter for partial shorts. Should be infinite resistance. Bill "Ed Barchetta" wrote in message om... This problem popped up after a trip to the mechanic and he suggested that it might take some time $$ to diagnose. Hopefully someone has seen this before. I've got a 1982 Mercruiser 140 (181) that developed a rough disposition after a few minutes on the water recently. It started 'coughing' at planing speed and then idled bad to the point of stalling, even back on the trailer. While the engine would be sputtering, the tach would show the opposite of what was going on, ie: when the engine would nearly stall the tach would jump up erratically and alternately nearly bottom out when the rpm's rose. I found that if I disconnected the tach connection on the coil, the engine idled and cruised normally. The wire goes from the coil, through the throttle/shifter and then to the tach. To eliminate (or verify) that the tach itself might be the problem, I disconnected it at it's end and reconnected the coil end. The rough engine returned immediately. Without tearing out the wiring, I'm guessing a short or disconnection in the throttle area but don't really know what to expect once I'm in there. Has anybody any suggestions or experience with such a problem? Thanks, Ed |
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