Search the Community

hi guys. I'm still trying to find why my car runs like crap, after 3 years (although I'm doing less and less about it. project fatigue combined with lack-of-a-clue-paralysis). Part of the problem is that I bought someone else's project (complete) "that only needed to be taken to the dyno for a tune," and since I didn't build it myself, I'm not sure what could be wrong in the set up. Issues i'm having is that it runs rough, both at idle and when driving. It'll misfire pretty much all the time, espcially under boost (but not ALWAYS). It's got a megasquirt, but it's essentially untuneable; I'll work on getting some ok AF mixtures, only for the AF ratios to go crazy for a week or two, then to change again... there are a few other weird things, but.. that's not the point of today's topic.... I've been thinking that my stock, original coil might be a little old, maybe not producing enough voltage anymore, or skipping some ignition events... but there is also the ignition module between the Megasquirt and the coil; that could also be faulty, I've seen set ups where the MS2 runs the coil directly... (DIYautotune https://www.diyautotune.com/support/tech/install/nissan-datsun/megasquirt-your-280zx-turbo/)... so really, I know I could modify my MSII to run the coil directly, is there a benefit to having a ignition module? should I even be looking at it? Thanks. Seb