Bad Temp sensor. ('92 4L) - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-20-2011
JLo JLo is offline
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Bad Temp sensor. ('92 4L)

My question is would a bad temp sensor keep a truck from passing smog? Perhaps keeping the mixture too rich. Wanna know before I take it in for round two.

Thanks,
James
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Old 01-20-2011
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It shouldn't, my sensor was bad, and after i replaced it my truck still had ****ty gas milage, so i don't think it would effect fuel mixture, just the trucks cooling system, but if its bad you might as well replace it, i think its only 16 dollars at advance, you trucks almost as old as mine so it could probably use one.
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Old 01-20-2011
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Quote:
Originally Posted by JLo View Post
My question is would a bad temp sensor keep a truck from passing smog? Perhaps keeping the mixture too rich. Wanna know before I take it in for round two.

Thanks,
James
Ford Fuel Injection Engine Coolant Temperature Sensor (ECT) It sure will. It helps to adjust your air/fuel ratio.
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Old 01-20-2011
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huh thats interesting, just antother reason to dislike EFI engines even more, stupid sensors lol
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Old 01-20-2011
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Originally Posted by 894banger View Post
huh thats interesting, just antother reason to dislike EFI engines even more, stupid sensors lol
Seems that their alot like women, can't live with them,can't live without them.
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Old 01-20-2011
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haha, there you go, thats pretty funny :D
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Old 01-20-2011
JLo JLo is offline
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Good to know, I did replace both so I'll just hope thats the problem. Can anyone recommend a cheap OBDI reader? I read the whole guide on how to record and interpret the code but I'm lazy and wouldn't mind having a cheap OBD reader in the garage.

Thanks,
James
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Old 01-20-2011
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well, mine only cost like 32 dollars from advance, solved the problem i was having, so it was worth it
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Old 01-20-2011
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There should be two coolant temp sensors...i may be mistaken but one for the PCM and one for the gauge. The one for the PCM lets the PCM know when the engine is at operating temp so it can switch the fuel trim into closed loop and start receiving feedback fromt he oxygen sensors....changing fuel ratio
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Old 01-21-2011
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correct & alot more.
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Old 01-22-2011
JLo JLo is offline
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Passed Smog!

Thanks guys, I'm new to this forum but already liking it. Very helpful place.
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Old 04-15-2011
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Hi guys Im new, but have a question. So what would happen if the PCM sensor was bad exactly? Say the Sender is working fine and the ECT sensor is bad. I was working on my thermostat housing (replacement actually) and pulled the wires out of the connector to the ECT sensor NOT Sender. Any help would be appreciated!!!
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Old 04-15-2011
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Fuel economy will suffer thats about it. Just replace the sensor you will pay for it in fuel costs later!
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