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I bet the diode in the alternator is bad and is bleeding a/c current into the electrical system causing the humming noise you spoke of. And when this happens it also wreaks havoc on the crank position sensor.
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What plugs/plug gap do you have? I had similar issues with feedback through the radio and cutting out up top because I got some plugs that were too cold for my set up. Worth a look to check cheap stuff first...
-Jonny2012 Silver Mustang GT 5.0:stock.
'00 Performance Red Mustang GT 4v turbo 6-speed 540rwhp/572rwtq (SOLD)
'07 Honda CB919 (SOLD)Comment
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New alternator and the problem is still there!!!!!!!
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That's a voltage/ground strap issue. The bucking is because of a low voltage at the coils causing a weak spark.Comment
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No more worries.......the engine let go this morning as I pulled into work!!!!!!!Comment
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It is easier to build strong children than to repair broken men -Frederick DouglassComment
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Time to get out of the mustang market for a while lolComment
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New battery going in tomorrow, along with I got a new alternator for it, new coil pack for the one that previously broke, new plugs, oil change and injector cleaner, recharging k&n filter, cleaning all ground and battery connections, and double checking all grounds, as well as removing all the stereo speaker wires that are just routed through out the car for a previous system, as well as previous alarm. All in efforts to get the car running back on par, eliminate the ground buzz, and get this car on the road to a new owner!Comment
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What about the motor?Comment
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It was a plug that backed out and since has been replaced and car started back up like a champ lolOriginally posted by JimD View Post
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