Fouls plugs after 50-55mph
its rich, (which engine, there are more than 1) ?????
and is not in closed loop mode (ECU) fix that first.
so diagnose rich.
EFI engines. no country stated, as others have carbs way newer,.
1: too high fuel pressure, (gage it) alldata.com has spec. and steps.
2: injector(s) leak. same tool above finds this, ask.
3: ECT reads low temp all time time, (thermostat bad, or missing?)
4: IAT reads too low. (TBI engines, with MAP sensors)
5: 02 sensors bad. (if all else is good and o2 reads wrong its bad)
6: exhaust leaks near, 02, causing o2 to read lean, forcing max rich.
7: did you run the ECU scan codes? the Check engine flashing light using the diagnostic jumper , yet?
mostly those. there are tests for each. ASE ways and means.
if your swift has a heated 02 sensor, it can even hold closed loop
at idle..... sure can, and if so , i check that first.
then closed loop at 2500 rpm , in neutral. (how is complex)
on these old dogs. suz, the worst ,no scan tools. are sold over the counter. so I must use a scope.
i watch the 02 sensors output. and make sure engine goes to closed
loop, if not i fix that. first.
there are ways to do this, (by me forcing lean or rich using other tricks of the trade. ask. I do so , to see if i can wake up the o2 sensor.
this is all covered in ASE courses...... this magic./
id be all over, fuel pressures, REAL not guessing or squirting checks bs.
id be all over exhaust leaks near the O2.
and first a new 02. most cars, its like long ago ,dead and you
look and the tip is , GONE! 1992 oxy sensors are useless.
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