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why does my coolant temp sensor cause high idle?


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Sensor_Coolant_For_ECU.jpg

 

 

This is the image I was looking at the kind of made me think that the one on the left was supposed to be the CTS...notice the relation to the exhaust. 

 

Also saw a picture of a real block that made me think differently. I'll have to check that rear spot Friday, I guess it's just covered in gunk. If it's easier to get a 5/16 square socket, then I'l; just do that over drilling/tapping.

 

Thanks for the info guys. I know I've been asking, and not really making an progress. I'm planning a wedding, working full time, and going to school full time. Taking all the effort I have to do anything other than sleep and work. 

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He could always look at the casting number on the block.

 

8933002665, 53005535: 1987-1990 Renix blocks
53008405: 1991-1995 YJ, XJ, ZJ
3010341, 53010449, 53020569: 1996-1998 TJ, XJ, ZJ (except 1998 ZJ)
53020514, 53020515: 1998 ZJ
53010449AA : 1999-2001 XJ, 1999 TJ
53010327AB, 53010328AB: 1999-2004 WJ & 2000-2006 TJ

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He could always look at the casting number on the block.

 

8933002665, 53005535: 1987-1990 Renix blocks

53008405: 1991-1995 YJ, XJ, ZJ

3010341, 53010449, 53020569: 1996-1998 TJ, XJ, ZJ (except 1998 ZJ)

53020514, 53020515: 1998 ZJ

53010449AA : 1999-2001 XJ, 1999 TJ

53010327AB, 53010328AB: 1999-2004 WJ & 2000-2006 TJ

I'll check this out while I'm under there.

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The Renix ECU has default settings for the sensors when it detects a sensor out of range/not connected.  You are saying the default for the block temperature sensor is better than the reading it is sending.  Could be, sensors do go bad in strange ways.  I can't imagine a 2000 rpm idle under any condition, however.  Good way to loose bearings, seals and oil filter on a cold engine.

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