what sensors are they?

[mj88]

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

[Geonovast]

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.

[500 MJ]

:thumbsup:

[garyindiane]

:agree:

 

This is a good page for sensor location and troubleshooting.

http://www.lunghd.com/Tech_Articles/Eng ... ostics.htm

-Gary

[mj88]

thanks for the info. I went to the auto parts store and those are the right sensors. those knock sensors are not cheep.

[Geonovast]

Don't bother with the knock sensor unless it's not running right. My first two Renix XJs had them unplugged and ran fine.