Join Date: Dec 2009
Location: French Harbour, Roatán; Honduras.
Drives: 1985 Subaru Loyale (wagon), 2000 Kia Sephia (sedan), and 1969 Mercury Comet (coupé)
Mentioned: 10 Post(s)
Tagged: 1 Thread(s)
Quoted: 144 Post(s)
I tried with all the possible Solutions
In my personal case, our "KiaStein" which is a 2000 Sephia that runs with a 2003 Spectra engine and has only one temperature sensor; the Check Engine light comes and goes randomly due to that Temperature being reported as Below specs; since we acquired this car, used; (same behaviour with older engine) and the OBDII shows that infamous P-0128 code.
Despite of having everything great on the cooling system, and despite of trying with different thermostats from 170º F passing to 180 Fº and upto 195 Fº, the check engine light randomly came On and went Off; sometimes it went away for a whole month, sometimes it stayed like forever, and suddenly went Off for a week... and so on... there are days where it goes Off in the morning, and comes back On on the night of the same day.
I never liked the idea of having a Thermostat that has an increased temperature than the Thermoswitch on the Radiator; the downsides of using an increased temperature Thermostat, are:
►The radiator's Main Fan could be "On" for more time, because the Thermostat's Temperature will not match the Thermoswitch's Temperature.
► The engine will keep working Hotter for prolongated periods, wich has its downsides, you know.
What I did (Which I do Not recommend) is to completely Remove the Thermostat for testing purposes.
I removed the Thermostat long years ago because here at the Caribbean Never snows; and I've noticed three things:
1) The same faulty code / same check engine light Behaviour persists identically. With or Without the Thermostat there are absolutely No changes at all.
2) The engine only needs five more minutes on early mornings, to reach its normal operating temperatures, and the Temp needle on the instrument cluster, stays rock solid where it should be during all day long; if the car gets parked for three hours then restarted, it only takes a couple of minutes to be back at normal operating temperatues again. Also it doesn't matter if it is driven on a Hot day on horrid traffic jams, or on freeways at high speeds on Cold days; with or without A/C, the temperature stays where it should be. Never goes too low nor too high... only goes an hair low with A/C during long downhills on cold rainy days... but still the temperature is good.
3) Since the car behaves identically with the standard Thermostat, the Higher temperature thermostat and without thermostat at all; I decided to leave it Without Thermostat since long years ago; the Check Engine Lights still comes and goes Randomly, always on same Temperature code, P-0128.
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