QuestionThe codes showing are Code P0125 and code P0175 car is running to rich and vacuum increases speed up and down
when running I just had the water pump replace could a wire been unplug as well?
Jim
Answer0125 is means that the computer is registering the engine coolant temp. to be too low. (cold)
0175 means the engine is running too rich.
Rule of thumb is you try and correct the smallest number first.therefore, let's address the 0125.
There are 3 common reasons for this one. First, the ECT sensor is unplugged. It is located just beside the thermostat housing. It has a 2 wire connector with a tan and a black wire. Make sure it is firmly connected. Second is that the cooling system wasn't bled of air when the water pump was replaced. Here's the way to do it.
3.3L and 3.5L
With the engine cold and not running, open the thermostat bleed valve located on the top of the thermostat housing. Install a 1/4-inch clear hose about 48 inches long, to the end of the bleed valve and the other end into a clean container. This is to keep coolant off the drive belt. Slowly refill the coolant pressure bottle until a steady stream of coolant flows out of the thermostat bleed valve. Gently squeeze the upper radiator hose until all of the air is removed from the system.
Close the bleed valve and continue to fill up the coolant pressure bottle to the proper level. Install the cap back on the bottle and remove the bleed hose. Start the engine and allow to run until normal operating temperature is reached.
Check the cooling system for leaks and correct coolant level. Be sure that the thermostat bleed valve is closed once the cooling system has been bled of any trapped air.
The third possibility is that the ECT ( engine coolant temp.) sensor is defective and should be replaced. Once the computer registers the engine temp properly, it will shut off the choke program and the engine will return to normal idle.
