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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 12-05-2013, 05:05 PM
Winter3531 Winter3531 is offline
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Secondary Air Injection Removal?

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.
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Old 12-07-2013, 01:39 AM
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Prototypemech Prototypemech is offline
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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.
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Old 12-07-2013, 07:53 AM
Eddiec1564 Eddiec1564 is offline
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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).
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