88XJSport Posted April 5, 2009 Share Posted April 5, 2009 There is a group of wires coming from along side the drivers side valve cover, down underneath the truck. One group goes to the o2 sensor, one goes to the knock sensor, and there is a third connector, with 2 wires, and I can't see where it goes. Anyone know what this is? Link to comment Share on other sites More sharing options...
Ed in North Ga. Posted April 5, 2009 Share Posted April 5, 2009 the CPS go`s across that area, and terminates right there- also the renix era oil pressure sensor- or are you further down? Link to comment Share on other sites More sharing options...
88XJSport Posted April 5, 2009 Author Share Posted April 5, 2009 Drivers side. Its one harness. 3 wires go to the o2 sensor, two wires go to the knock sensor, and there is another connector right above the knock sensor with 2 wires. Its no where near the CPS. Link to comment Share on other sites More sharing options...
Geonovast Posted April 5, 2009 Share Posted April 5, 2009 Electric fan? Link to comment Share on other sites More sharing options...
88XJSport Posted April 5, 2009 Author Share Posted April 5, 2009 Nah the fan connector is up next to the fan. The mystery plug is near the oil pan next to the knock sensor. I guess I need to post a pic then... Link to comment Share on other sites More sharing options...
mfpdm Posted April 5, 2009 Share Posted April 5, 2009 One is the O2 sensor, one is the knock sensor, and the last one is the coolant temperature sensor. O2- on exhaust knock- on block behind the engine mount by oil pan Temp- on block under intake manifold :cheers: Link to comment Share on other sites More sharing options...
JeepTruck Posted April 5, 2009 Share Posted April 5, 2009 mfpdm is correct it is for the coolant temp sensor. It is locates right above the motor mount bracket. We just changed that sensor on my brothers 87 with 4.0 in it on Thursday. It is a pain to change we had to remove the power steering pump to do it. Dave Link to comment Share on other sites More sharing options...
88XJSport Posted April 5, 2009 Author Share Posted April 5, 2009 Yep, the connector is indeed above the motor mount bracket. How could I forget about the CTS??!?!?! Ive been trying to fight a nasty rough idle, and Ive just been digging for anything out of the norm, frayed wires, etc. Also Ive changed everything under the hood except the 4.0. Oh well. Thanks for the CTS reminder. Link to comment Share on other sites More sharing options...
mfpdm Posted April 5, 2009 Share Posted April 5, 2009 I've got to get both the temp and knock for mine. Broke one pulling the connector and the other pulling the engine. It will be easier for me seeing that the motor is out of the truck. :D :cheers: Link to comment Share on other sites More sharing options...
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