Bad ECU 1.6 8v 1990.

[Lynyrd]

hello, welcome to Texas !
my guess the CEL lamp is on but does not flash.(yet) this lamp on means the ECU knows whats wrong, so we ask it to report this.
so that means to insert the diagnostic jumper. (a paper clip (metal only unpainted)
into the cars DLC socket, also called, the Monitor connector?
This jumper can be in 2 places.
1: the fuse box above left knee (if not UK car RHD)
2: the front of battery see that here.

http://www.fixkick.com/CEL/DLC/DiagJump.html

my guess, see this red car body here. see that connector in front of battery?

jump B to C. and see the CEL lamp flash ERROR codes. 12 = good, others all bad.

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No works. CEL light not blinking.