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Hi,
Running rich does cause all three. It depends on air temperature and engine temperature to what extent and when.
Have you considered the engines Coolant sensor for the fuel injection system or ECU?
It signal output sets the mixture program from start, warming up and completely hot @ operating temperature.
The sensor is located under the third intake runner just above the flame trap hoses.
Kinda a bugger to get to but it can be changed without draining the Coolant if you keep the rest of the system closed up tight and cold.
It's more important to use a 198 degree Fahrenheit or 92 degree Celsius thermostat.
I recommend this temperature thermostat, made by Wahler, if you want the engine to get its best mileage.
So you will have to know if both are working correctly. Again, the ECU needs that report from the sensor to be correct too so know the engine upper hose is nice and hot.
The dash gauge, which uses a separate sensor, closer to the front of the engine, should read horizontally @ operating temperature. If not, be suspicious of the thermostat first as many brands can be sluggish or stick open. I have had "Caloric" brands do both and the sticking shut one is the worse condition.
With thermostats you need to lower the level only, unless it's time to change the Coolant.
Using the block drain or what I do, because I don't like crawling under a car, is to either siphoning or by lowering the reservoir down beside the engine and pour off what's in the tank.
With the excess gone, you can raise the reservoir higher than the motors Coolant, take the hose off the tank and then by lowering that hose only into a pail beside the engine.
Draw off until the hose is just below the thermostat and in a few quarts it will eventually stop.
Put the hose back up on the tank and attach it back to the saddle bracket.
Maybe this was more information than you wanted to know but what the heck, it's free (?) .... if you don't count the internet fees!
I paid for half, so you can toss whichever half you paid for. (:-)? Mine is tossed out there already in case your confused (:)
Hey, I tried my best for an evenings pleasure.
Good luck!
Phil
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