hey everybody i have a 97 ford 150 4.2 l and i have codes p1537 and 1538 showing upi need to fix these codes so i can get my truck through inpections! any suggestions?

 

Here is a short version of the test.

DTCs P1518, P1537 and P1538 indicate IMRC is stuck open. DTCs P1512, P1513 and P1519 can indicate IMRC may be stuck closed. DTCs P1516 and P1517 indicate IMRC input error. DTC P1520 indicates IMRC control circuit malfunction.

Possible causes:

Cables improperly routed (binding) or seized.
Damaged/disconnected IMRC housing return springs.
Lever/shaft return stop obstructed/bent.
Lever/shaft wide open stop obstructed/bent.
IMRC lever/shaft stick/bind or disconnected.
IMRC actuator cable/gears seized.
For electric IMRC, view cable routing. Make sure cables are not binding or improperly routed. With key off, cable core wire at IMRC housing attachment must have slack and lever must contact Closed Plate Stop Screw. For vacuum operated IMRC systems, make sure sensor linkage is attached and secure. Lever must contact closed plate stop screw with key off. Also, make sure IMRC sensor harness connectors are attached to the proper bank. They are interchangeable. If necessary, use a breakout box to pin out the harness connectors to the corresponding electronic EC pin. Refer to the IMRC System Description in Section 1A , Intake Air and Throttle Body, for illustrations.
Note: IMRC return spring is strong. Make sure return springs operate properly and plates open and close fully.

Manually open and close IMRC plates at intake manifold (press IMRC lever down for Escort/Tracer) and feel for sticking/binding

 

One other thing; the IMRC on the 4.2L is at the very rear center of the engine, pretty much underneath the intake plenumn. Be sure to inspect the plastic grommets that hold the arms in. They have a habit of wearing out, and the arms will come out and set code.s