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intermittent misfire shows on oscilloscope

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Post time 2017-12-12 14:12:14 | Show all posts |Read mode
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.

thanks

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