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Unread 12-19-2009, 12:22 AM   #31
Machine15825
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1994 YJ Wrangler 
 
Join Date: Oct 2009
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Wow, didn't realize this was such an old thread haha

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94 YJ: 4" lift. 32-11.5-15's.
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Unread 03-02-2010, 09:12 AM   #32
Neo1130
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2009 JK Wrangler 
 
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Yes, I know it's an old thread but I'm starting to get tired of mine...

I had a leaky radiator and cracking hoses when I bought my YJ. Changed those out and while I was in there, why not the thermostat? I tried a 180 thermostat. WAY too cold... Ran at 165 via gauge and laser thermometer. I tried a 195... Same thing, maybe 170 degrees this time... Still too cold for me... I tried ANOTHER one... Same as before... So, 180 was too cold and tried two 195's with the same problem. I will try ANOTHER one in a different brand this time.
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Unread 03-02-2010, 10:32 PM   #33
Castr8r
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2006 LJ Wrangler 
 
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Don't settle for the cheapest t'stat; they just won't last! I replaced mine several times in a year (AZ, had extended warranty), and finally sprung for a higher quality- end of problem. Make sure the "bleed" hole is on top when you put it in. If it doesn't have a "bleed" hole, then you have a cheapo that you'll probably be replacing in a couple of months...
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Unread 03-04-2013, 10:28 AM   #34
awatson
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I am having the same problem. I guess I need to change T-stats again.
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Unread 10-21-2013, 03:33 PM   #35
pbmustache
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1993 YJ Wrangler 
 
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So I have a 93 4.0 and was having an issue with the temp gauge only showing 105. I replaced the thermostat and the tempatue sending unit. With the key in the acc position the gauge now pegs past 260. Any ideas on what would cause that? I'm Thinking a ground, anyone know where the ground is for the temp sending unit?? Thanks
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Unread 10-22-2013, 06:39 AM   #36
Que89YJ
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1989 YJ Wrangler 
 
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The sensor is the ground and going full scale is the sensor wire being shorted.
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Unread 10-22-2013, 07:47 AM   #37
pbmustache
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So I need to replace the sensor wire or should I try splicing it?? Not sure why it wasn't pegged before I put the new unit in. Here's a pic of my old sending unit.
image-2365626693.jpg

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Unread 10-22-2013, 08:35 AM   #38
Xatten
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That sensor is for the ECM I believe. I could be wrong. The one for the temp gauge is at the very back of the head on the left side. At least on my 91 4.0. Although that one you posted looks like it went through an IED hit!
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Unread 10-22-2013, 09:24 AM   #39
pbmustache
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Haha, been there and done that. A little more then a blown sensor was damaged though! No, it's the the one for the gauge. I pulled it off last night and replaced it. Drivers side rear of the head. I got excited when I saw it thinking that I found the problem. Unfortunately it went from reading nothing to pegged. I'm wondering maybe bad sensor? If the ground was bad it should've caused the sensor to peg with the old sensor in, right?
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Unread 10-22-2013, 09:50 AM   #40
Xatten
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Quote:
Originally Posted by pbmustache
Haha, been there and done that. A little more then a blown sensor was damaged though! No, it's the the one for the gauge. I pulled it off last night and replaced it. Drivers side rear of the head. I got excited when I saw it thinking that I found the problem. Unfortunately it went from reading nothing to pegged. I'm wondering maybe bad sensor? If the ground was bad it should've caused the sensor to peg with the old sensor in, right?
I would think so. It's funny because my sensor is smaller and has a single post. My Jeep is a 91 so I have no idea. Que might have some idea about the difference. Any chance that the wire/wires may have chaffed somewhere?
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Unread 10-22-2013, 09:57 AM   #41
Que89YJ
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1989 YJ Wrangler 
 
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By disconnecting it the guage should go full hot by shorting it should go to 0. Ground the wire for the sensor to any point nearby that is a good ground. The needle should go to cold.
yjgaugespecs-1-.jpg

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Unread 10-22-2013, 09:57 AM   #42
Que89YJ
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I had it backwards.
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Unread 10-22-2013, 10:05 AM   #43
pbmustache
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I'll check the readings when I get home. When I plugged the new sender in it pegged hot, I disconnected the sender and checked and was pegged cold. I love electrical problems.
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Unread 10-22-2013, 01:16 PM   #44
Que89YJ
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Bad or wrong sending unit.
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Unread 10-24-2013, 08:52 AM   #45
pbmustache
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Update.....so I took back the new sensor to advanced auto. Found out that even though their computers said I got the best one for the vehicle it was not an OE part. Go figure! Got a new sending unit installed, gauge did not peg. As I was waiting for the jeep to warm up.....it sputtered and died. Now it won't stay running. I think the fuel pump might've gone.
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