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post #1 of 9 Old 02-08-2007, 06:43 PM Thread Starter
Snipeston
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1989 YJ Wrangler 
 
Join Date: Oct 2004
Location: Blue Springs, MO
Posts: 175
YJ Temp Gauge

Ok bear with me here...

I am running an 4.0L from a 98 XJ that was back converted to OBD1. All the wiring is out of a 94 YJ. Here is the issue:

I believe the dash temp gauge does not run off the water temp sender in the thermostat housing. There is a single wire (BRN/YL or PPL/YL) with a flat/spade style connector at the back driver side of the block that there is no hook up for on the engine itself that I can see. I am assuming this is the temp gauge wire based on my old 4.2L and a breif look under a friends 4.0 YJ, but couldn't get a good enough look at it.

Any ideas???


Hey round eye...
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post #2 of 9 Old 02-08-2007, 06:46 PM
ovrlnd
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when I had my 2.5L in the 88 there was a purple wire with a connector that ran to a bolt on the block, it would come off quite a bit, if it was off the temp guage would not work. if that helps

"We'll get out of this disaster in time for the next one"
"I'm done recomboobulating the energy-mo-tron"

88 YJ, 350/350 Chevy, Twin Stick Dana 300 with JB 32 spline rear output, 6.5" lift, Front Scout II Dana 44 w/Yukon 4340 shafts, trac loc, 4.27's, Warn Premium Hubs, flipped YJ Tie Rod, Ford F150 front calipers, Rear Scout II Dana 44 w/Alloy 4340 shafts, HD RPT retainer plates, 4.27's True trac, Steeltech Disc brakes, Cage upgrade, B&M Prostick Shifter, Custom Fabbed tire, gas, jack carrier, 3/8 angle rear bumper, clevis's all around, old & reliable rep8000 winch. Flood lights. loud stereo. 35x12.50 swampers and a bunch of other stuff
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post #3 of 9 Old 02-08-2007, 06:49 PM Thread Starter
Snipeston
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1989 YJ Wrangler 
 
Join Date: Oct 2004
Location: Blue Springs, MO
Posts: 175
Problem is I cant seem to find the bolt, nor can I find it online at the part stores. Is it just a bolt? The wire connector I have looks like:

(-- )

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post #4 of 9 Old 02-08-2007, 06:55 PM
ovrlnd
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mine just fit over one of the studs at the rear of the valve cover, really wasn't screwed to anything as it was a rubber booted connector that slid right on.?

"We'll get out of this disaster in time for the next one"
"I'm done recomboobulating the energy-mo-tron"

88 YJ, 350/350 Chevy, Twin Stick Dana 300 with JB 32 spline rear output, 6.5" lift, Front Scout II Dana 44 w/Yukon 4340 shafts, trac loc, 4.27's, Warn Premium Hubs, flipped YJ Tie Rod, Ford F150 front calipers, Rear Scout II Dana 44 w/Alloy 4340 shafts, HD RPT retainer plates, 4.27's True trac, Steeltech Disc brakes, Cage upgrade, B&M Prostick Shifter, Custom Fabbed tire, gas, jack carrier, 3/8 angle rear bumper, clevis's all around, old & reliable rep8000 winch. Flood lights. loud stereo. 35x12.50 swampers and a bunch of other stuff
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post #5 of 9 Old 02-08-2007, 06:57 PM Thread Starter
Snipeston
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1989 YJ Wrangler 
 
Join Date: Oct 2004
Location: Blue Springs, MO
Posts: 175
That was the way my 4.2L was, but this motor came out of a 98XJ and I don't see anything that would resemble this.

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post #6 of 9 Old 02-08-2007, 07:00 PM
ovrlnd
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I can go check my 00 xj that is my driveway if you like?

"We'll get out of this disaster in time for the next one"
"I'm done recomboobulating the energy-mo-tron"

88 YJ, 350/350 Chevy, Twin Stick Dana 300 with JB 32 spline rear output, 6.5" lift, Front Scout II Dana 44 w/Yukon 4340 shafts, trac loc, 4.27's, Warn Premium Hubs, flipped YJ Tie Rod, Ford F150 front calipers, Rear Scout II Dana 44 w/Alloy 4340 shafts, HD RPT retainer plates, 4.27's True trac, Steeltech Disc brakes, Cage upgrade, B&M Prostick Shifter, Custom Fabbed tire, gas, jack carrier, 3/8 angle rear bumper, clevis's all around, old & reliable rep8000 winch. Flood lights. loud stereo. 35x12.50 swampers and a bunch of other stuff
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post #7 of 9 Old 02-08-2007, 07:04 PM Thread Starter
Snipeston
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1989 YJ Wrangler 
 
Join Date: Oct 2004
Location: Blue Springs, MO
Posts: 175
That would be great!!!

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post #8 of 9 Old 02-08-2007, 07:15 PM
ovrlnd
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damn it's cold! the temp sensor wire on my xj runs through the plastic wire cover rail and goes into the harness/loom. the only thing attached to it's block is on the back driver side stud there are two nuts that sandwich a ground strap to the firewall. the xj might use a different setup, but your yj wiring still requires the old setup did you try to connect it temporarily to see if it fixes the issue?

"We'll get out of this disaster in time for the next one"
"I'm done recomboobulating the energy-mo-tron"

88 YJ, 350/350 Chevy, Twin Stick Dana 300 with JB 32 spline rear output, 6.5" lift, Front Scout II Dana 44 w/Yukon 4340 shafts, trac loc, 4.27's, Warn Premium Hubs, flipped YJ Tie Rod, Ford F150 front calipers, Rear Scout II Dana 44 w/Alloy 4340 shafts, HD RPT retainer plates, 4.27's True trac, Steeltech Disc brakes, Cage upgrade, B&M Prostick Shifter, Custom Fabbed tire, gas, jack carrier, 3/8 angle rear bumper, clevis's all around, old & reliable rep8000 winch. Flood lights. loud stereo. 35x12.50 swampers and a bunch of other stuff
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post #9 of 9 Old 02-09-2007, 09:42 AM
Alfons
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1992 YJ Wrangler 
 
Join Date: Jul 2005
Location: Ontario, Canada
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I just converted a 2005 TJ 4.0 to run in an ODB1 YJ. The temp guage sender hole isn't in those blocks, but you'll notice a flat spot where it's located in the older castings - I drilled and tapped a hole for the sender in this spot & it does go into the water galleries, so you should get a good reading this way.

I drained the coolant first, then drilled and tapped the hole (1/8 NPT), then used a magnetic probe to remove most of the cuttings, then put some teflon tape on the sender & installed it - works good.

I needed to drill & tap various vacuum points on the intake as well - the bosses are all in the right (or close to) places, just not used. I drilled out some of the pipes so that I could use the standard YJ vacuum fittings as well - the thread on these is 1/4" NPT.
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