Zya73 Posted October 13, 2008 Share Posted October 13, 2008 Hello I'm woking on a 1976 Datsun 280Z with a modified L28 engine. I'm using MS-II V3.57 (from DIYautotune.com), EDIS-6 ignition, as well as a relay board from DIYautotune.com. My ignition system is working just fine (accept my PIP signal is 5V rather than 12V), and I can communicate with MS-II just fine. The trouble I'm having involves the injectors. They are not grounding through MS-II like I expected they would (I have no fuel spray). I've checked for voltage at the injector connectors. I've got battery 12V on one side and 3V to 4V on the other. I'm assuming the 3V to 4V is just parasitic voltage from MS-II, however, I may be wrong. I haven't worried too much about current and resistors because I'm using the relay board with 10 Amp resistors for the injectors. My ground from the relay board is very solid, and as far as I can tell that's where MS-II also grounds it's self so I don't have a seperate ground for MS-II. I've double check tht the jumpers on the main board are in the proper positions, and they are. I've looked at Megatune settings so many times my it hurts to think about it. I haven't looked into the .ini file settings much, but I don't think there will be any issues there casue I haven't done any code editing (accept for choosing the settings when setting up Megatune and they are correct). I also haven't hooked up my Stimulator. I'll be doing that later this afternoon to see if I come up with anything. This is my first time installing Megasquirt and even though I've been farely diligent in my studying, this one's got me stumped. Any constuctive suggestions would be greatly appriciated. Thanks Loki73 Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted October 14, 2008 Share Posted October 14, 2008 Sounds like you have an injector or injector driver issue. There should be 12V on both side of the injector with the key on, engine not running. The 3-4V on one side shows that there is almost a ground signal on the signal side. Just not enough for the injector to be pulled open. Disconnect the injector clips and test for resistance to ground, with the engine not running this should be an extremly high resistance, better yet infinantly high, though there is sometimes high resistance to ground through the injector drivers. I suspect you may have a piched wire or possibly a bad relay board/injector driver. Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted October 14, 2008 Share Posted October 14, 2008 Try using the Stimulator and check if the injector LEDs on it blink. Let us know what you find there. Quote Link to comment Share on other sites More sharing options...
niner11 Posted October 15, 2008 Share Posted October 15, 2008 Yep, when one or both banks of my injector lights on the stim don't blink it usually means that I have a shorted out injector driver. Is a pretty cheap fix if that turns out to be the problem. Quote Link to comment Share on other sites More sharing options...
Zya73 Posted October 16, 2008 Author Share Posted October 16, 2008 Thanks to the help of Matt at DIYAutotune.com things are up and running like they are supposed to. Evidently it was just a matter of updating my firmware and software and that fixed things! I apriciate your helpful suggestions. Quote Link to comment Share on other sites More sharing options...
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