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Tachometer jumping when off throttle
#2
no idea why you are doing this?? (slept 3 nights ,woke and i think, your EGR is dead, missing , and you are trying to hide this fact>?)
I have no clue as to what is missing on this engine>? (from stock)
no idea at all how you wired CDI up. make a diagram.?
no idea what model, Jaycar box you have they have many.
zero, inputs on that..
I can say no side kick needs such a device. ever. (unless turbo'd or force induction or other wild modifications to engine and mode of combustion)
yes, 5vdc square wave is the CMP. in distrib. 100% normal , have the scope photos, all sensors. (that swing)
the CMP is an open drain (collector) hall sensor, with the PULL-UP resistor in the ECU side, to 5vdc, (near) (cmp runs injection timing and spark , and is not optional)

deleted, i deleted my guessing.. what is there and reasons for doing all this.
(all non stock guessing>?..gone.)
i can't help you with out knowing what you have now and where you going with it and why do this? (my guess engine is missing some major parts, like EGR)

warning , that 300 volt CDI pulse is very bad for any stock part on that car. ECU and all other related parts. igniton coil, ignitor, , cmp, etc.
http://www.fixkick.com
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RE: Tachometer jumping when off throttle - by fixkick - 12-31-2015, 10:51 PM

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