bad caps, they all do that, 89 to 95.
ok low idle, rich.
if the corner cap leaked acid, it loves to eat up a trace there,, under it, causing odd behavior, , can go to DEEP BACKUP mode, this is worse than failsave (limp) mode. Backup mode is when everything fails. (inside ECU horrid rich conditions and no advance of timing,etc)
you said the nag switch is unplugged, its 3 wires. so that,can not cause false CEL nor stop the eCU from flashing its codes, as it does always does when active.
No 12s is a bad bad sign.
the old ecu can be fixed, but it takes very careful, bypass jumper.
Does this ecu fail the 5vdc test ? that is, the 5vref makes it to the TPS? 4.75 to 5.25 is the spec, range to read.
pin A34 (white conn, is A)
![[Image: 8v-tbi-schematic91to95.jpg]](http://www.fixkick.com/ECU/8v-tbi-schematic91to95.jpg)
one common failure is below , see the CAP C111 removed. see the + sign, ?
that pad has a feed-thu- called VIA's and can be gone, killing the VIA power pass through at this point, it can be fixed, but do not drill this PC to do that.
http://www.fixkick.com/ECU/hell/html/image_7.html
sorry at Pin A23? 5v
ok low idle, rich.
if the corner cap leaked acid, it loves to eat up a trace there,, under it, causing odd behavior, , can go to DEEP BACKUP mode, this is worse than failsave (limp) mode. Backup mode is when everything fails. (inside ECU horrid rich conditions and no advance of timing,etc)
you said the nag switch is unplugged, its 3 wires. so that,can not cause false CEL nor stop the eCU from flashing its codes, as it does always does when active.
No 12s is a bad bad sign.
the old ecu can be fixed, but it takes very careful, bypass jumper.
Does this ecu fail the 5vdc test ? that is, the 5vref makes it to the TPS? 4.75 to 5.25 is the spec, range to read.
pin A34 (white conn, is A)
one common failure is below , see the CAP C111 removed. see the + sign, ?
that pad has a feed-thu- called VIA's and can be gone, killing the VIA power pass through at this point, it can be fixed, but do not drill this PC to do that.
http://www.fixkick.com/ECU/hell/html/image_7.html
sorry at Pin A23? 5v
http://www.fixkick.com