Can anybody please tell me how would i test Air Intake Temp Sensor and the Water Thermo Sensors? I have been trying to figure out why my car is running so rich and i can't find anything wrong. Checked the O2 sensor, did the TPS, new plugs, new wires. Am i missing anything? By the way i get no codes from the ECU, WHAT CAN IT BE.

 

I have the same problem... How do you know yours is running rich? Do you have an A/F gauge?

 

There is couply of ways to tell. No i don't have an a/f gauge but i put in brand new plugs and then when i pulled them couple of weeks later they were black thats a clear sign of a rich mixture. Also, when friends are driving behind me they can see the black smoke coming out. Considering my situation i know its because i am running rich. And that is also why i am wasting so much gas. Did you check your o2 sensor thats usually the problem. (not in my case though)

 

can anybody help?

 

High fuel pressure could do it. I don't recall what all components might be involved.

 

The water thermo sensor would do that. To check, disconnect and check with an ohmmeter both cold and hot. Cold, the reading should be 2.45 Kohm at 68 degrees. If it is warmer, it will be a little lower, like 2.0 Kohm over 70 degrees. With the engine warmed up (176 degrees) the meter should read about 320 ohms.
Intake air thermo sensor in the AFM is checked by unplugging the plug, and metering pins 5 and 7 (pin 1 closest to the front). Readings should correspond to the following table.
68 degrees 2000-3000 ohms
104 degrees 900-1300 ohms
140 degrees 400-700 ohms.
Using a hair dryer to warm up the sensor should show a drop in the reading.
If you have a turbo, there is also an intake air thermo sensor on the throttle body inlet pipe. Unplug and check across the 2 pins, comparing to the following table.
68 degrees 41,500 ohms +- 4,200 ohms
122 degrees 11,850 ohms +- 1,200 ohms
185 degrees 3,500 ohms +- 350 ohms
Well, you get the idea. Good luck!

Irv, Keith's dad

 

Thank you Irv. I really appreciate it. I can't seem to find the water thermo sensor. Can you please point me to it? Its a N/A by the way.
Thanx

 

The water thermo sensor is located in the water pump housing underneath the alternator. It faces backwards (towards the firewall). It has a 2-pin wire clip plug on it. Hope this locates it for you.

Irv, Keith's dad

 

Thanx, Irv I am going to check them this weekend and let you know what happened.

 

Testing the sensor(s)is only half the task.Your sensor may check out exactly according to the spec when you do the resistance test but the sensor circuit may still be your problem.Note that the codes stored by the ecu only reflect a DEAD circuit and not one with a defective reading.Ultimately the only way to locate your problem will be to measure the voltage signal to or out of the ecu.The shop manual gives you the voltage values fo each input and output at the ecu.
If you are really lucky the sensor will test defective.