zardos Posted December 5, 2011 Share Posted December 5, 2011 I have a Megasquirt Kit from Nige (MS1 SnE 029v) for my 3.9 Serp Engine that was previously running fine on default map Nige put on it and with the ECU connecting to my laptop via serial cable. Working on other vehicles has got in the way for a while and it has been about 1.5 months since I had run the engine. I came to start it again today and it turns over fine but no hint of firing. I tried to connect Megatune to it and cannot get it connect. When the ignition is tuned on the D14 LED flashes are few times then starts to flicker and the fuel pump relay is not activated. The battery voltage is good and there is power to the ECU Since starting it last all I have done is partially drain the engine coolant and removed the rear rad to physically fit some electric fans and refit the rad and fill up with coolant (not the fans are not wired up yet). I did not think that the D14 LED should flicker in that way until the engine was running (as it should be Spark A) Any suggestions on what to look at next? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 5, 2011 Share Posted December 5, 2011 Was it built for EDIS and you're trying to run it with a coil? That'd cause problems. Quote Link to comment Share on other sites More sharing options...
zardos Posted December 5, 2011 Author Share Posted December 5, 2011 I was built for EDIS and running EDIS supplied by Nige. And it was running fine 1.5 months ago with no changes made to the setup/wiring. Quote Link to comment Share on other sites More sharing options...
SORNagain Posted December 5, 2011 Share Posted December 5, 2011 Was it built for EDIS and you're trying to run it with a coil? That'd cause problems. Surely it would never have run if this was the case? 6 weeks is plenty of time for a dodgy connection to oxidise... I find Mega-confused is the default condition... Quote Link to comment Share on other sites More sharing options...
zardos Posted December 5, 2011 Author Share Posted December 5, 2011 All wiring joints were soldered, the vehicle has been in a dry garage for the 1.5 months. If the ECU is just powered and earth'd should you be able to connect to it via serial cable? Quote Link to comment Share on other sites More sharing options...
SORNagain Posted December 5, 2011 Share Posted December 5, 2011 I would have thought so yes. Is there a way you can check the ECU is booting properly? Quote Link to comment Share on other sites More sharing options...
Dave W Posted December 6, 2011 Share Posted December 6, 2011 If there is power to the ECU you should be able to connect to it with MT. I'd start by checking the earth connection is good. A bad/disconnected earth would explain the symptoms you describe - the fuel pump relay is one of many circuits that get switched to earth and if that earth doesn't exist it will reset the CPU continuously. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted December 6, 2011 Share Posted December 6, 2011 Do you have a STIM? Quote Link to comment Share on other sites More sharing options...
rusty_wingnut Posted December 6, 2011 Share Posted December 6, 2011 relay not latching? Quote Link to comment Share on other sites More sharing options...
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