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mikemac44

Trigger issues with atom set up?

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Hi,I have wired a g4 plus atom to a Nissan 260z.it is running a Nissan 280zx intercooler turbo engine L28e 6 cylinder,using the distributor from the same vehicle which has CAS in distributor.I have replaced the disc with a 24/1 disc.I have configured triggers as...trigger mode multi tooth/trigger priority set to trig 1/rpm filtering 1 default. Trigger 1 optical/hall.filtering level 1.trigger pull up on.trigger edge falling.multi tooth pos =cam.tooth count 24.Trigger 2 optical/ hall.filtering level1.pull up on.edge falling.sync mode to cam pulse 1x but I am unable to set base timing as I have no spark.On cranking i do get trig 1 and trig 2 boxes going green.Do you have any suggestions what to check next.thanks

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Your trigger setup sounds correct.  Is there RPM displayed when cranking?  Possibly the trigger 1 & 2 wires inputs are swapped?  To confirm you can try back probing the trig 2 pin with a multimeter and slowly turn the dizzy by hand, you should only see it go to 5V once per rev.  

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Hi Adam,no I was not getting rpm signal whilst cranking.I swapped trigger wires and left, the trigger settings as described prevously.Engine fired a few times and ran for a short time,not long enough to check with timing light.The engine sounds either retarded or advanced in ignition timing whilst it is trying to start.should I start trying to alter the timing figures in the calibration section,to see if I get a better start so I can then check timing with timing light and set timing figures.cheers

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To initially set the base timing you can just set injection mode to "off".  The engine will then not try to start when your cranking so you can check timing with a timing light while cranking.  Once you have a timing mark somewhere in the ball park, then turn fuel back on and do a final check again once its running.  

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