You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
My chk eng. lite yields codes P-1537 & 38 "Intake Manifold Runner Control Stuck Open". If IAC is stuck open would engine still run good at idle? Cleaned MAF, IAC, new air filter. Truck runs perfect at idle with only an occasional buck or misfire upon acceleration at highway speed. Checked for vacuum leak off
PCV to elbow, not an issue. Any ideas appreciated!!!
The IMRC and IAC are different. The IAC just controls the idle speed. The IMRC works sorta like a 4 barrel carb. Your intake manifold has 2 ports for each cylinder. It opens the second set of intake ports when under a heavy load or high rpm.
Possible causes: (generic list)
Leaky vacuum reservoir.
Damaged vacuum lines.
Damaged vacuum solenoid.
Damaged vacuum actuator.
IMRC actuator cable/gears seized.
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.
Open IMRC control circuit.
Open VPWR circuit.
Shorted IMRC circuit.
Damaged PCM.
__________________ Dave - FTE moderator Forum Guidelines
this space for rent
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.
Check engine light, code P-1537 & P-1538 1998 F150 4.2L 6 Cyl
BINGO
