Temp guage - Pirate4x4.Com : 4x4 and Off-Road Forum

nevergetstuck · 08-20-2001, 07:16 PM

This past weekend I tweaked my temp guage on my 87 Wrangler. The supposed replacement doesn't fit. (too big) I tried a CJ piece and it fits but the guage now is maxed out. I tried with three different pieces with no luck. when i disconnect the wire the guage goes to zero, so i know that its getting a reading. I stole/borrowed a temp gun from work and the engine temp was under 200 degrees. Any ideas? Its a 258 with fuel injection.. <IMG SRC="smilies/question.gif" border="0">

Brad Smith · 08-20-2001, 07:41 PM

Just a guess but if the guage is maxing out replace the sending unit. Mine did the same thing after i replaced the radiator. Some are located in the intake manifold and others are in the radiator. <IMG SRC="smilies/question.gif" border="0">

Jaffer · 08-21-2001, 07:50 AM

The descrepency between your CJ and YJ gauge readings lays in the fact that the resistance values in both the temp and fuel indicator are reversed.
If you put a CJ sender in for the CJ gauge, the high resistance of the sender will properly read cold.
Your YJ sender offers low resistance on a cold engine causing the CJ gauge's needle to max out.

08-20-2001, 07:16 PM	#1 (permalink)
nevergetstuck Registered User Join Date: Aug 2001 Member # 6615 Location: Los Angeles Posts: 2	Temp guage This past weekend I tweaked my temp guage on my 87 Wrangler. The supposed replacement doesn't fit. (too big) I tried a CJ piece and it fits but the guage now is maxed out. I tried with three different pieces with no luck. when i disconnect the wire the guage goes to zero, so i know that its getting a reading. I stole/borrowed a temp gun from work and the engine temp was under 200 degrees. Any ideas? Its a 258 with fuel injection.. <IMG SRC="smilies/question.gif" border="0">

08-20-2001, 07:41 PM	#2 (permalink)
Brad Smith Wheeler Join Date: May 2000 Member # 968 Location: Garden Grove , CA USA Posts: 199	Just a guess but if the guage is maxing out replace the sending unit. Mine did the same thing after i replaced the radiator. Some are located in the intake manifold and others are in the radiator. <IMG SRC="smilies/question.gif" border="0"> __________________ "J.E.E.P.= Just Empty Every Pocket"

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08-21-2001, 07:50 AM	#3 (permalink)
Jaffer Registered User Join Date: Jan 2001 Member # 2769 Location: Farmington NM Posts: 1,877	The descrepency between your CJ and YJ gauge readings lays in the fact that the resistance values in both the temp and fuel indicator are reversed. If you put a CJ sender in for the CJ gauge, the high resistance of the sender will properly read cold. Your YJ sender offers low resistance on a cold engine causing the CJ gauge's needle to max out.