How to change the transmission fluid and filter in a Jeep Cherokee automatic AW4
The Jeep service manual recommends changing the fluid every 25,000 miles. I rarely see XJs get serviced that often.
Changing the fluid and filter requires removing the transmission pan. A handy drain plug on the AW4 allows for fluid draining. Odly for the XJ, it uses a 14 mm wrench to remove it. But, I recommend changing the filter as well.
I recently swapped the injectors in my Dad’s Wagoneer. I like the results so much I ordered another set of injectors from K Suspension for my Jeep. Both of us have 4.7 stroker motors built by Titan engines.
Replacing the idle air control valve to solve erratic idle speed. IAC Valve.
The Renix Engine fuel injection controller adjusts the idle speed by opening and closing a valve that bypasses the throttle plate. Often the Renix engines will have a high idle speed due to the Idle Air Control Valve leaking air past the plunger.