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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 02-02-2009, 03:08 PM   #1 (permalink)
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1994 4Runner SR5, Bad ECT (Coolant Temp Sensor)

I have a 1994 4Runner SR5 4x4 V6...

Sometimes when I start it it sputters out and does not want to run, almost like it is not getting fuel. If I just give it a little gas for a cpl min it will begin to run fine.

I also only get like 14mpg 70% highway (70-80mph) 30% in town driving.

Would this most likely be the Engine Coolant Temperature Sensor?

And if so does anyone know where this sensor is located. A pic would be fantastic but even a description would be extremely helpful.

Thanks in advance
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Old 02-02-2009, 03:56 PM   #2 (permalink)
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Also sometimes it dosen't want to shift into overdrive for the first couple miles of driving...
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Old 02-02-2009, 03:58 PM   #3 (permalink)
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It could be (it could be a lot of things), but I would check the cold-start injector first. I assume you're not in Southern California, so temp is the issue. You can pull the electrical plug off the injector, if your problem doesn't change, you may be on the right track (of course, that doesn't tell you if it's the injector that's bad, or the ECT providing the signal, so the next step involves a voltmeter on the connector).

The ECT is located in a fist-sized aluminum block on the very back of the engine, below the top of the intake manifold, and has a lot of hoses to it. Work on any of those sensors is difficult.

Last, just about anything can cause poor mileage. Have you checked your timing? Tested the TPS (throttle position sensor)? All easier than the ECT.
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Old 02-02-2009, 07:15 PM   #4 (permalink)
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Quote:
Originally Posted by scope103 View Post
It could be (it could be a lot of things), but I would check the cold-start injector first. I assume you're not in Southern California, so temp is the issue. You can pull the electrical plug off the injector, if your problem doesn't change, you may be on the right track (of course, that doesn't tell you if it's the injector that's bad, or the ECT providing the signal, so the next step involves a voltmeter on the connector).

The ECT is located in a fist-sized aluminum block on the very back of the engine, below the top of the intake manifold, and has a lot of hoses to it. Work on any of those sensors is difficult.

Last, just about anything can cause poor mileage. Have you checked your timing? Tested the TPS (throttle position sensor)? All easier than the ECT.

I will look for the ECT again tomorrow after work, thanks for all the other advice; cold start injector likely.

If it were perhaps timing or TPS wouldn't my problem be more consistent?

I did just have my valve cover gaskets replaced maybe the mechanic bumped into the connection for the ECT and knocked it loose or something. What make's me think that it is infact something else (not the ECT) is that I do not have a check engine light on...

Last edited by sshepherd03; 02-02-2009 at 07:22 PM.
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Old 02-02-2009, 07:15 PM
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1994, 4runner, 94, 98, bad, coolant, cts, diagram, ect, engine, runner, sensor, signal, temperature, toyota

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