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Message: <blockquote data-quote="EastEndAngler" data-source="post: 2111962" data-attributes="member: 41720">Truck went to the dealer this morning and they just called saying my issue is the check valve. I brought the TSB and told them it did not apply but that the pinpoint test could be used to determine what was wrong. I had replaced on my own after my first trip to the dealer for an intermittent grinding (F/R) that they could not replicate back in early 2024- (FL3Z-3A7888-B from Tasca 2/1/24). They are now saying that the check valve is not covered by my Ford ESP. They claim the part # is not covered and therefore I'm on the hook for diagnosis, labor and the new check valve.  - is there any recourse on the OEM parts warranty?<table style='width: 100%'><tr><td>UPON ROAD TEST, UNABLE TO PINPOINT NOISE. PUT VEHICLE IN AIR AND HAD ADDITIONAL TECHNICIAN DRIVE IN AIR. FOUND WHEN SWAPPING FROM 2HI TO 4HI VEHICLE GETS PARTIALLY STUCK IN 4WD. CHECKED VACUUM CANISTER FOR LEAKS, NONE FOUND. MANUALLY PERFORMED VACUUM TEST TO EACH IWE ACTUATOR, BOTH OK. CHECKED BOTH IWE ACTUATOR HOSES FOR LEAKS, OK. CHECKED TO MAKE SURE BOTH IWE ACTUATORS MANUALLY RELEASE FROM HUBS. REMOVED VACUUM CHECK VALVE. PERFORMED VACUUM TEST. CHECK VALVE BLEEDS DOWN, CAUSING IWE ACTUATORS TO NOT FULLY DISENGAGE WHICH IS THE CAUSE OF THE CUSTOMERS COMPLAINT. NEW CHECK VALVE NEEDED TO CORRECT CUSTOMERS CONCERN. Part Number: FL3Z-3A788-B</td><td> </td></tr></table>[USER=35543]@FordTechOne[/USER] - how different are the Raptor's IWE systems compared to a standard F150? What is the logic in not capping the system? Off-road modes, torsen diff? School me, I know nothing.</blockquote>

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