this is easy, 'an ECU pro, (custom) retired.
uSA car, assume1
has OBD2 PCM, see above.
the first error is not checking spark at every spark plug,
no engine stated but its I4, sure.
it has 4 cops with DIS igntion system great hint there.!!!!
if one cop dead, one cop bad
if all 4 dead, the PCM has CMP/CKP errors (sensors)
so you failed to spend cash on a real scan tool, not 4 useless cops.
then youd done this, (posted 100 times, )
- check all fuses first with voltmeter (sans fsm schematic, sad to do all)
- keyon, CEL lamp most glow ! if not fuses blown.
- connect OBD2 scan tool, if comm fail no, the fuse on pin 16 of DLC is blown , fix fuse, yes, scan tool now works ! talks.
- i crank for 5 seconds,
- i release key, not off, BINGO DTCS for sensors dead,
- works on all cars 1987 to now,, all ecus will tell you this. just LOOK in fact they all report 1 pulse in 10 missing, (FSM words)
scan tools work
they can be barrow, bought, rented, )
A DEAD car needs a tool that is if you dont wont to go broke guessing what input to ecu is dead,(CKP./CMP)
fails cold, so my guess is you missed one sensor
now wild guess2, sure im blind and blind messup 90%
say all cop coils do spark , testing errors.
say you check spark timing on #1
its way off,
the cam has slipped, i can say what, no engine stated
and compression is 1/2 normal, that be first on older cars,
if sparks good, and compresion good, try test fuel cold
run now?
if spark is good and timing good, use wide open throttle to clear
flooding on all cars.
it cuts fuel.
if id dont clean spark must be bad,
takes spark on all 4 not just one, so.... not stated.
you need to do tests, and stop guessing at parts
if you put in just 1 bad part, now you have horrid,double failure.
for sure, do that tests and STOP guessing.and win.