Ford Bronco And F-150 Links - Knocking Noise May Occur when Engine is Cold and under Acceleration could be coming from the Secondary Air Injection (AIR) Pump TSB 96-7-27 for 95-96 Bronco, Econoline & F Series

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FORD BRONCO -> ENGINE & COOLING; swaps, specs, snorkels, vac. diagrams... -> Knocking Noise May Occur when Engine is Cold and under Acceleration could be coming from the Secondary Air Injection (AIR) Pump TSB 96-7-27 for 95-96 Bronco, Econoline & F Series

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Knocking Noise May Occur when Engine is Cold and under Acceleration could be coming from the Secondary Air Injection (AIR) Pump TSB 96-7-27 for 95-96 Bronco, Econoline & F Series; "...Verify the knock noise is coming from the AIR Pump and install the correct AIR Pump Service Kit for the application. Refer to the following diagnosis and service procedures for details. Test drive the vehicle cold. The knock noise is most noticeable while the engine is under load at approximately 1500 rpm. The concern may be verified on automatic transmission-equipped vehicles by first setting the parking brake, and with the wheels chocked, starting the engine and placing the vehicle in gear. Verify the knock noise is coming from the AIR Pump by using a technician’s stethoscope while the engine speed is approximately 1500 rpm. THE NEW AIR PUMP IS ORIENTED IN A POSITION 180 DEGREES OPPOSITE TO THE PRODUCTION AIR PUMP. Install the specified AIR Pump Service Kit for each application using the following charts: 1995 F-SERIES UNDER 8500 LBS GVWR, BRONCO, AND CALIFORNIA F-SERIES; Part Number Description Kit Number Number: 1 F6TE-9A486-FA Air Pump F5PZ-9A486-LB 6834 1 F5TE-9S476-JA Hose - Air Pump-To-Outlet Tube 1 F5TE-9S449-CA Hose - Air Cleaner-To-Air Pump 1 F2TE-9H447-AA Clamp - Hose-To-Tube..." See Charts at Site
Source: by Ford via Chilton