01-30-2014, 05:57 AM
Join Date: May 2011
Total Cats: 0
Megasquirt dying/losing connection after running for ~20 seconds
Hi guys, I know this isn't a Miata question but it is a Megasquirt question. I know you guys deal with that a lot.
this current project is EFI-ing a mate's TA22 celica.
The megasquirt is just controlling the fuel side of things. We still have a distributor.
When I start it, it runs like a champion for about 20 seconds, then it starts cutting in and out, the fuel relay starts ticking (meaning the fuel pump starts alternating between on and off) and the computer loses connection with the Megasquirt.
At first we thought it was the hall sensor not reading properly, we did every mod under the sun. Didn't solve the problem, switched to a VR. Exactly the same problem.
We replaced D19 and visually checked C22 (couldn't get a replacement) as per the troubleshooting guide on randomly-dying-megasquirt's. No difference.
HELP! PLEASE!! Supposed to be in QLD right now...in this car.
Basic set up:
- wired to take control of spark through single coil at a later date
- was running a hall sensor, converted to VR,
tried running it with the fuel pump hardwired. Exactly the same. Noticed something though: the middle LED (which I'm led to believe flashes each time the tach input gets a signal) went off being continuously illuminated (as expected with 36 triggers for every revolution) but when it starts ******* out it starts flashing around twice a second.
So internal timing problem? We changed the entire internal circuit from Hall to VR and (obviously) changed the external sensors and wires as well, only to have the same problem??
Last edited by beelzeboss; 01-30-2014 at 06:10 AM.