Title: intermittent misfire shows on oscilloscope [Print this page] Author: breckjensen Time: 2017-12-12 14:12 Title: intermittent misfire shows on oscilloscope Edited by breckjensen at 2017-12-12 14:15
Hello,
That'd get you going alright. I've not had bad new plugs, though have gotten them with gap way off. I cracked an insulator once while installing plugs and engine missed bad - could hear/see the arc at night (old Chevy with points).
I generally look for a change in performance and if it "seems" the same, I assume parts are good, but this could bite me... On this car, I pulled the DIS/coils, checked for cracks, etc (saw none), put it back together and car ran worse. That "mild crack" I heard when tightening a coil pack must've messed one up - the car ran worse... found the secondaries on the 2/5 coil were open - replacing the coil got me back to the "normal" intermittent misfire.