10-18-2013, 03:13 PM
Join Date: Dec 2005
Total Cats: -2
update for people in the future who have similar problems:
The whining/humming noise at idle was improper frequency on the IAC. Setting was close to 200(hz? MHz?) which is the setting for a 1.6, when it should have been at close to 400 for a 1.8.
As far as the crappy idle and running, my TPS was not getting 5v from the top light-green/white wire.
I tested the continuity on the megasquirt harness for the gray wire on pin 26 of the megasquirt side mainboard plug. It tested fine, so I pulled the ecu case apart and looked at the mainboard. Following the schematics for pin 26, I checked out every potential problem area.
Problem ended up being fuse F2 on the mainboard...it's literally right up against the middle of the DB37 connector One end was soldered into its hole, but the other apparently was not soldered. I soldered it up (first time soldering EVER! Did a pretty good job considering. I was scared id **** it up :-D)
Anyway, boxed it back up and plugged in the harness, turned the key on, and checked the voltage top wire (5VREF, lt. green/white stripe) on the TPS connector with my multimeter. Sure enough, I had the required 5V passing through, instead of the ~0.02 mV I had before :P.
So I hopped in, plugged in the laptop, and calibrated the TPS. This time it worked great instead of reading at zero for both closed and wide open throttle.
I started her up, adjusted the idle screw a bit, and went off for a test drive! Finally driving normally, exactly as it should.
She's officially a squirter now LOLOLOLZ