AN ACR LGT FLC EXPERIENCES PROBS TRACKING COLTS NECK VOR 350 DEG RADIAL INBOUND. THE FLC IS IN AGREEMENT THAT THEIR OPERATING PROC WAS CORRECT; THAT IS; THAT ALL SWITCHES WERE IN THE CORRECT POS AND THAT THEY DID NOT HAVE THE RECIPROCAL COURSE SET IN THE HSI. THEY THINK THAT THERE MAY BE A PROB WITH THE COLTS NECK VOR.

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DURING DEP; WE WERE INSTRUCTED TO JOIN COL 350 DEGS TO TRACK INBOUND FROM A HDG OF 220 DEGS. BOTH CAPT AND FO CDI NEEDLES INDICATED FLY R; HOWEVER; CAPT NOTICED BY GND REF THAT WE WERE ACTUALLY ALREADY S OF THE 350 DEG COL RADIAL. ABOUT THE SAME TIME ATC ISSUED INSTRUCTIONS TO TURN L TO GET BACK ON COURSE. A CHK OF GPS/VOR SELECTOR SHOWED WE WERE BOTH STILL IN VOR/LOC. DURING THIS CONFUSION ATC ADVISED WE HAD TFC AND ISSUED NEW CLB AND HEADING. HOWEVER; SEPARATION MAY HAVE BEEN LOST; TCASII SHOWED THE TFC AT APPROX 4.8 MI; 1000 FT BELOW. WE RECEIVED NO TA OR RA FROM TCASII. AT THIS POINT MYSELF; THE CAPT AND SO ARE SURE NAV SWITCHES WERE VOR LOC CDI NEEDLES WERE CORRECT WITH 170 DEGS SELECTED. DURING REST OF THE FLT VOR ON ALL OTHER NAV STATIONS AND FREQS WERE CORRECT. SUGGEST THAT BAD SIGNAL SENT OUT OF COLTS NECK VOR. I DON'T KNOW IF POSSIBLE; BUT PERHAPS. SUPPLEMENTAL INFO FROM ACN 363543: ALL NAVAIDS CHKED AND SWITCHES POSITIONED IN THE ACFT CORRECTLY. ASSIGNED A CLB TO 17000 FT. WE DEPARTED 6000 FT; AND TFC CALLED AT 7000 FT. GOING THROUGH 8000 FT AND A TURN TO 260 DEGS; THE TCASII SHOWED THE TFC 1000 FT BELOW AND 5 MI AWAY! WITHOUT FURTHER PROB; WE INTERCEPTED THE 204 DEG RADIAL SBOUND AT 5 DME. THIS WAS ALSO CONFIRMED BY ATC DEP. ENGINEER LATER RPTED A SIMILAR SIT WITH THE SAME ACFT IN THE VICINITY OF COLTS NECK.