Search for somebody with an oscilloscop or have one for yourself. There are cheap ones on te market used or brand new like hantek.With an oscilloscop you may find where the irritation in the current starts. Old school garages have them too.I do not think its a mechanical problem like a broken valve spring.You would have found it already.
I have been watching this post and have some minor thoughts.
Have you taken a water spray bottle and sprayed the harness down? along with plug wires? a little at a time while running while moving the harness around
I have seen plug wires go bad and arc out, but I have also found sensors with hair line cracks that let water in, I also found bad wire harness connectors that way as well.
Originally Posted by mecanicus
I am not opposed to buying a o-scope if a decent one can be had for a reasonable price.
Anyone have any recommendations?
79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy
93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver
99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.
Like already mentioned, if you have a laptop have a look for the hantek1008 or the picoscop 2204 A .The hantek is a 8 channel one while the picoscope has only two channels. Both are about 150 bucks and work pretty well for us nechanics. If you download the picosoftware first, you may see a lot of examples what to measure on a car. Of course you may buy one at a much higher price and become an electronics. :-)
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