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Official LH2.4 EZK Wasted Spark Conversion - Installation Instructions

widewagon92

now with more caffeine!
Joined
Apr 25, 2020
Location
Maryland
My best wasn't good enough - immediately after posting I find someone in this thread with a similar issue. D'oh......

A couple pages back mylesofsmyles had this issue and it turned out to be a faulty j702t unit. Considering this was an $20 ebay purchase from a miata with 237k miles, this is looking like a real possibility. If the j702t isn't putting out a strong enough signal to trigger the tach, would connecting it to the stock coil like I did have amplified the signal and caused the tach to read? I'm gonna break out the multimeter and start browsing ebay again in the meantime.
 

widewagon92

now with more caffeine!
Joined
Apr 25, 2020
Location
Maryland
Update: put in a second, better condition Miata module and the tach works without having made any other changes. So if everything but your tach works and you're using an na Miata module, odds are yours is faulty.
 
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