Andrew Robertson Posted June 10, 2012 Report Share Posted June 10, 2012 Hi All, running sequential on old-school SB Chev with 1 ignition drive firing an MSD box / single coil / distributor, G4 Extreme firmware 4.6.9. Â Trig 1 is a MSD flying magnet crank trigger that gives 4 pulses per rev, trig 2 is an optical shutter wheel arrangement inside the distributor that gives 1 pulse per 720 crank degrees. Â This set-up has been running strong for about 3 years. Â Problem now is an intermittent miss that has been showing up increasingly under higher loads and RPM - sometimes feels like a very short complete engine cut. Â When this happens, I get a burst of trig 1 errors - the count will jump about 4-8 at a time. So a few questions: 1. Â I assume that a problem downstream of the ignition drive (i.e. a problem with the MSD box, coil, cap/rotor, plug leads, or plugs) would NOT show up as a trig error, so I can safely assume the problem relates to triggering? 2. Â What does a trig 1 error actually mean? Â The crank trigger is trig 1 but these things are ultra-reliable - whereas trig 2 could well be the problem as I made that myself out of a gutted distributor and a modified unilite module. Â Does trig 1 error basically mean there is a problem with the relationship between the two triggers seen by the ECU? 3. Â When I first had the car running in a much earlier firmware version I used non-sequential batch mode, with 2 batches of 4 injectors, and simply used the crank trigger to drive it. Â I have tried to go back to that now so I can determine whether trig 2 is the problem. Â When I switch to multi-point batch mode I assumed trig 2 would disappear from the ignition menu and that I would simply have to enter a revised timing offset for trig 1 to get the car running? Â The car will not start unless trig 2 stays configured as is. Â How do I take it out of the equation to test it? Â Why is it required in batch mode Â - what am I doing wrong? Thanks, Andrew Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.