i have a 1995 F150 with the 4.9L. i am looking to remove the secondary air but not totally sure how to do so. i mean i understand pull the pump the diverter valves all the lines etc but where the secondary air injection tube goes into the head im not sure how to close those off i cant seem to find any threads that talk about it if anyone has any advice please reply.
I would assume ford used the same system that they used on their small blocks. If thats the case, once you get the injection-tube off, there are 5/8"-11 threads machined into the head. You just need to go to the hardware store and buy the shortest 5/8"-11 bolt you can find and plug up the port with it.
On my trucks, I cut those pipes off going into the head. Then bent them over to seal off the pipe before going into the head. I did that as I rounded a few of those nuts off even after a week long soak with PB blaster. I only had 2 of them requiring extra squeeze to seal them back up. Use a good pair of vise grips to bend and squeeze shut.
After 10 years I had no further issues. Besides the ECU complaining of the secondary air is inop(no preformance issues).