With obd1, I've never had problems checking codes with jumper wire. Maybe there is always a first time, but, hasn't happened, yet. On older vehicles, I have seen mil lamp that didn't work for some reason. On those, I used a scanner to look at live engine data, see if anything looks out of kilter.
I'd have to check for injector pulse on the injector ground circuit, engine cranking. A noid lite will work. Also, if you have a digital multimeter that has a tach--duty cycle--dwell setting, I believe any of those will react to dc pulse. If the meter has a min/max setting, that should work.
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Monday, June 1st, 2020 AT 1:43 PM
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