ECT sensor
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ECT sensor
Could the ECT sensor cause my 93 Bronco to run rich, resulting in failed emissions test? Correct me if I'm wrong, but to my knowledge the ECT sensor tells the PCM when the truck has reached normal operating temp, which then tells the PCM to lean out the fuel/air mixture. Since I have had the Bronco, the temp gauge on the dash has never registered correctly. So, my question is, if my ECT sensor is faulty and not telling the PCM that the engine is warm, will the truck run rich and emit large amounts of CO and HC?
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Joined: Jun 2006
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Have recently been wondering the same thing. Temp. gauge almost always stays below the low end of the NORMAL range, and the bronco seems to run great at start up, but rich at normal operating temps. BTW, dallas, thanks a lot for your posts about replacing the tube/plunger assembly on the steering column. Made my job a lot easier, and your description of the job was concise and dead-on.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
There are two sensors for engine coolant temperature. Yes, you're correct that if the ECT is not working you'll fail emissions because that's how the computer knows when to go to closed loop. A code scan will tell you if it's working.
However the dash gauge is a seperate sensor. It's only for the gauge and has nothing to do with the computer.
However the dash gauge is a seperate sensor. It's only for the gauge and has nothing to do with the computer.
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So where is the sensor that goes to the gauge on the dash? Whether my ECT sensor is bad or not, I might need to know where the other one is, because my gauge acts really strange. It's a 93 with the 302 Thanks
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Driver's side of the engine threaded into a hole in the lower intake manifold near the front of the engine. Takes temp readings from the coolant in the front crossover passage in the lower intake. Should be ONE wire as the sender is nothing more than a varaible resistor that changes value as the temp changes and thereby changes the resistance to ground (the ground being the lower intake manifold/engine).
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Well, I think I got the problem fixed. When I went to disconnect the connector from the sensor the plastic from the sensor came off in the connector. Bad thing is that I didn't even pull hard. It was almost like it was dry rotted. But, anyway, my gauge reads where it should now that I replaced the ECT sensor. I figure the other one was problem as old as the truck, so about 13 years. I guess it was about time to replace it. Thanks for the help.
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