01 Grand engine wiring question

classy_gene

New member
I recently acquired a 01 Grand that the motor was already taken out. I have put another motor in it buy can not figure out where two of the plugs go! They are both 4 pin yellow square plugs on drivers side. One on top of the intake behind the air intake and the other one drivers side at front of engine. Pics attached, Thanks!!
 

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They are o2 sensor plugs. The 99-04 i6 motor has 2 more o2 sensors on the exhaust manifold. The manifold has 2 pre-catalytic converter units built in as well. The reason for this is because jeep also reduced the size of the exhaust ports on the heads to help the engine/precat/o2sensor system to warm up faster.

Sent from my SM-J320V using Jeepz.com mobile app
 
They are o2 sensor plugs. The 99-04 i6 motor has 2 more o2 sensors on the exhaust manifold. The manifold has 2 pre-catalytic converter units built in as well. The reason for this is because jeep also reduced the size of the exhaust ports on the heads to help the engine/precat/o2sensor system to warm up faster.

Sent from my SM-J320V using Jeepz.com mobile app

Thanks! I figured what the connections were for. I guess that is what I get for working on it after being held over at work all night.
 
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