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.
ALLDATA OEM Auto Repair Information for Professionals
The leading provider of original...
Several factors can contribute to spark plug fouling:
- The air/fuel
ratio may be too rich as a result of incorrect carburetor adjustment or a poorly
performing fuel injection system.
- Worn piston rings or valve seals may allow too
much oil to leak into the combustion chamber, leading to oil fouling.
- The
ignition system may not be performing properly.
- Prolonged idling or continuous
low-speed driving may keep the spark plug from reaching its optimum operating
temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to
fouling.
Have each of the above checked and corrected.
Fuel, oil and carbon fouling can all be the result of different
causes but, once a spark plug is fouled, it will not provide adequate voltage to
the firing tip and that cylinder will not fire properly.
In many cases, the
spark plug cannot be cleaned sufficiently to restore normal operation.
Hence, I always recommend that a plug be replace, once it becomes fouled.
Cheers,
Scott
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