Thermo and sensor replacements
Yes, 4 exhaust pipe have some soot inside and gas mile is low 4km/L in city drive!
The needle of coolant gauge is stay at a little above 10 clock.
Replace your thermostat, it's defective. Suggest you also replace both sensors (on thermostat housing and
in lower radiator hose) as well. Both are relatively inexpensive and they play major roles in the control that
the DME exercises on engine management.
As previously mentioned, the sensor on the thermostat housing is dual-element. One is used for the analog
gauge in the instrument cluster, while the other is for the DME. When you are looking at "KTEMP" in test #7,
the digital display value is the one being
seen and used by the DME. So, if you seeing less than 78-79 degrees
while at freeway speed, with outside air temps of 50-60 degrees F (13-15 degrees C), fuel scheduling will
be biased toward rich, reducing power output, wasting fuel and contributing to long-term degrading of the
catalytic converters.
Regards,
Alan