mj88 Posted October 13, 2009 Share Posted October 13, 2009 I'm replacing the engine in my 89 cherokee 4.0l and there are two sensors on the drivers side by the engine mount that i can't figure out what they are. one is just above the oil pan and behind the engine mount. The next one is directly under the engine mount. I went to the auto parts stores and they couldnt help. I looked on my other two jeeps for any part numbers but they didnt have anything. I'm trying not to go to the dealer my last time there was just :mad: . any ideas Link to comment Share on other sites More sharing options...
Geonovast Posted October 13, 2009 Share Posted October 13, 2009 The one with the rat tail is the coolant temp sender for the ECU, and the one with the plug that looks like an injector plug is the knock sensor. Link to comment Share on other sites More sharing options...
500 MJ Posted October 13, 2009 Share Posted October 13, 2009 :thumbsup: Link to comment Share on other sites More sharing options...
garyindiane Posted October 13, 2009 Share Posted October 13, 2009 :agree: This is a good page for sensor location and troubleshooting. http://www.lunghd.com/Tech_Articles/Eng ... ostics.htm -Gary Link to comment Share on other sites More sharing options...
mj88 Posted October 17, 2009 Author Share Posted October 17, 2009 thanks for the info. I went to the auto parts store and those are the right sensors. those knock sensors are not cheep. Link to comment Share on other sites More sharing options...
Geonovast Posted October 18, 2009 Share Posted October 18, 2009 Don't bother with the knock sensor unless it's not running right. My first two Renix XJs had them unplugged and ran fine. Link to comment Share on other sites More sharing options...
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