Air Injection Troubles
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Air Injection Troubles
I have a 1996 F150 with the 4.9 Liter engine. The smog pump was getting noisy, so I replaced it with a new one. About 75 miles after replacing the smog pump, I recieved a check engine light. I read the code and it came up P0411 which is "Secondary air injection - incorrect flow". I figured that the new smog pump was the problem. So I took the pump back and exchanged it for another one. Shortly thereafter the code returned.
I have checked all connections to the smog pump and everything in the vicinity. I cleaned the smog pump air intake filter as well. I consulted my local Ford dealer and they suggested I put a vacuum on the diverter valve and see if it is functioning. I have done this and while I do hear movement internally, I have no way of being certain if it is operating 100%.
I can clear the code and it generally will not come back on during stop-and-go driving, but highway driving will bring it back. The code everytime has been P0411. I now have over 500 miles on the smog pump, so I know it is not a break-in issue.
Any suggestions would be appreciated.
Thanks.
I have checked all connections to the smog pump and everything in the vicinity. I cleaned the smog pump air intake filter as well. I consulted my local Ford dealer and they suggested I put a vacuum on the diverter valve and see if it is functioning. I have done this and while I do hear movement internally, I have no way of being certain if it is operating 100%.
I can clear the code and it generally will not come back on during stop-and-go driving, but highway driving will bring it back. The code everytime has been P0411. I now have over 500 miles on the smog pump, so I know it is not a break-in issue.
Any suggestions would be appreciated.
Thanks.
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