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post #1 of 12 Old 10-14-2013, 12:46 AM Thread Starter
97ZJ_FOORx4
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name that sensor

What's the sensor on top of the engine near the bolt that adjusts the idler pulley on the 4.slow? While adjusting my belt tension on my grand I noticed that it was loose, like the part that goes into the engine not where it disconnects. Looks like it might be on the water pump.and near the valve cover IIRC.

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post #2 of 12 Old 10-14-2013, 12:49 AM
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A picture says a 1000 words.
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post #3 of 12 Old 10-14-2013, 01:04 AM Thread Starter
97ZJ_FOORx4
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It's 2am here. I'll try to snag a pic on break. Usually my phone takes too big of a picture and it won't upload on here. It doesn't say anything about it on the Vic aside from the usual coolant sensor bad message, but that's always been there.
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post #4 of 12 Old 10-14-2013, 01:06 AM
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Unplug it and see what happens lol
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post #5 of 12 Old 10-14-2013, 01:10 AM Thread Starter
97ZJ_FOORx4
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My check engine light comes on
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post #6 of 12 Old 10-14-2013, 02:18 AM Thread Starter
97ZJ_FOORx4
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The one right above the belt. With the hoses going into the same piece

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post #7 of 12 Old 10-14-2013, 02:56 AM
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Coolant temp sensor in the thermostat housing which sends a signal to your temp gauge in the dash cluster. Was it leaking coolant when loose? When adjusting or removing/installing the belt it's best to disconnect the connector to it since it seems to be in the way with an extension. But that's not what it made it come loose from the housing and someone must have just not tightened it enough.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)


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post #8 of 12 Old 10-14-2013, 03:27 AM Thread Starter
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Nope no coolant leaking. I can pull on it and see two little wires going into the housing. I prolly knocked it around and it came loose with me adjusting the belt/ trying to disconnect the sensor. It's not loose like I could unscrew it. Its loose like I could pull the wires out of the sensor.

My temp gauge still works even though it's like that lol.
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post #9 of 12 Old 10-14-2013, 06:48 AM
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if you mean the locking tab is broken off the connector, I wouldn't worry about it as long as the connector has a friction fit with the sensor. You dont want it to bounce out and get caught in the belt/fan.


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post #10 of 12 Old 10-14-2013, 07:31 AM
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Tape it
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post #11 of 12 Old 10-15-2013, 12:18 AM
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Quote:
Originally Posted by 97ZJ_FOORx4 View Post
I can pull on it and see two little wires going into the housing. I prolly knocked it around and it came loose with me adjusting the belt/ trying to disconnect the sensor. It's not loose like I could unscrew it. Its loose like I could pull the wires out of the sensor.

My temp gauge still works even though it's like that lol.
Sounds to me like you've broke the ceramic in the sensor. I'd almost bet that your CEL is on. This sensor sends the temp to the computer for various reasons. I'd get it replaced when you can.

Yeah... your temp gauge would still work. The sensor for that one is by the firewall. It's behind the #6 cylinder on the Drivers side. Has either 1 or two wires attached to it.

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post #12 of 12 Old 10-15-2013, 03:38 AM
Uniblurb
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Quote:
Originally Posted by eagsc7 View Post
Sounds to me like you've broke the ceramic in the sensor. I'd almost bet that your CEL is on. This sensor sends the temp to the computer for various reasons. I'd get it replaced when you can.

Yeah... your temp gauge would still work. The sensor for that one is by the firewall. It's behind the #6 cylinder on the Drivers side. Has either 1 or two wires attached to it.
Hmm... Believe on the OBDII 4.0 engines, 96 and up, there is only one engine coolant temp sensor on the thermostat housing. And this is where the temp gauge receives receives the coolant temp signal passed through the PCM.

So your 94 would have 2 coolant sensors where the rear one would supply info to the temp gauge. But on the original poster's 97 4.0 there would only be one engine coolant temp sensor like on my 96. Someone can correct me if I'm wrong but there's no mention of 2 coolant temp sensors in the 96 FSM.

Agree, the temp sensor on the T-stat housing should be replaced if there's a CEL on and they're aren't very expensive. Teflon tape and/or gasket sealer/maker is a good idea on the threads if replaced to prevent leaks.

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