drranch

ok, had time tonight to pull the cold start injector and it had no leaks with the key turned on. I don't believe that is the problem however I could not get the truck to start running rich at all tonight but, like I say, it is very tempermantal and some days will run fine others it will act up 3 or 4 times in my 20 min. drive to work. Each occurance only lasting 5 - 10 seconds.

ahickman

Abe, you say that an O2 sensor (despite ohming out correctly per FSM) can go bad, but throw no codes. I have an O2 sensor on my 3.0 that I believe is causing it to run rich just as drranch's is doing. Hooked an oscilloscope up to it right at the ECU and can see that the voltage stays at 0.45 volts. Never oscillates over the 1 V range. Is there a safe way to fool the ECU into thinking it needs to run lean, maybe putting in a resistor of some value in place of the O2 sensor? Do you know how many ohms the sensor should be in order to push it between 0.5 V and 1.0 V at the ECU pins? This would perhaps iron out the O2 sensor?

drranch

I changed my coolant temperature sensor yesterday. Have drove the truck about 40 miles so far and it seems to be fixed. I tested my old sensor and as it heated up the resistance increased instead of decreasing as the specs showed. The $30 fix was better than some of my other options. I want to thank everyone for their input and helping me get this thing straightened out. However I am sad to say this truck will probably be for sale soon. I want more room and more towing capacity.

ahickman

Good to hear that you fixed the problem and it was relatively inexpensive. Funny how that little bugger can cause to many driveability/fuel economy problems.

Allstar93088

Where is the coolant temp sensor located on the 22re's? Does neone have a diagram or a pic?

ahickman

The sensor is located on the intake plenum up front. Look just down and to the left of where the coolant thermostat is located. You should see two sensors which screw into the aluminum cast, each with a two wire harness attached. Coolant sensor should be the one on the right.