1. #1
    classy_gene's Avatar
    classy_gene is offline Junior Member
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    01 Grand engine wiring question

    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!!
    Attached Thumbnails Attached Thumbnails 01 Grand engine wiring question-kimg2099.jpg  

    01 Grand engine wiring question-kimg2100.jpg  

    01 Grand engine wiring question-kimg2102.jpg  


  2. #2
    paradineai's Avatar
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    Re: 01 Grand engine wiring question

    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

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    Re: 01 Grand engine wiring question

    Quote Originally Posted by paradineai View Post
    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.

  4. #4
    paradineai's Avatar
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    Re: 01 Grand engine wiring question

    Now try swapping an engine, transmission, and transfer case all in under 4 hours without a lift or hoist.

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

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