2000 Ford Mustang Convertible Other - Engine

Question: my idle is high, i repaced the idle air control but the idle is at 1500 rpm air conditioning on and 800 AC off the service engine light is also on . this seemed to first happen there was a sound of a vacum leak for a while on start up this went away now i have the service engine light on and idle problem .the service code is po411 secondary air, injection system, incorrect flow . Is there some vacum operated control that raise and lower the idle when the AC is turned on? thanks joe ps it has the 3.8 engine

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Technican: Hello, I'm not a Ford expert but I'm a very good researcher and I can't help but notice no one is picking up on your question. Questions are not "assigned". I still want to help. I have over 30 yrs experience as a mechanic on primarily GM products. Have you had a dead battery or the battery disconnected prior to this high idle event? I'm wondering if your car's computer needs to relearn the idle speed for a/c on and a/c off? I'll be seeing an excellent Ford drivability technician tomorrow and I'll ask for some help for you. After all this time elapsed if you prefer a refund, write to, Site Administrator, .com and let him know how you stand. Would you like my help?,

Technican: Are you there? Did you adjust the idle speed screw trying to control this problem? Please advise.

Owner: no, i asked about the idle and why my service eng light is on . also which idle screw are you talking about?

Technican: The Ford drivability tech I talked with said there is a screw on the throttle body that one might turn to try and remedy a problem such as you have described. That is why I asked if you had adjusted it and I'm glad to know you didn't. It is not advised. I know what you asked. To completely clear the codes and reset the service eng light he advised the following: 1. Disconnect the car battery for ten minutes. 2. While the battery remains disconnected hold down the foot brake for one minute. 3. Reconnect the battery and drive the car normally and the computer will relearn idle speed and your driving habits. Concerning the P0411 code it is suggested that perhaps the car was refueled while running or the gas cap was not locked back on completely tight and an emissions code set as a result. The above action will clear this code as well. Thoughts?,

Owner: after i turned on the air conditioning the service engine light came back on.

Technican: The P0411 sets when the O2 monitor doesn't detect lean condition caused by secondary airlfow (this is a functional test the system performs). For the high idle check for the most common causes first. A vacuum leak at the throttle body, intake gasket vac leak, etc. It may be possible that air from a vacuum leak is confusing the functional test for secondary air.. Not sure where you had the codes checked, but autozone and advance auto are popular chain stores that perform this service free.

Owner: the check engine light is still on and i have done everything you said to do. what eles can i do?

Technican: You need to have the air pump and it's plumbing checked to see if the pump is functioning properly. If you live in an area where it is not forbidden by law, some people eliminate the air pump. You would need to find a technician with the software to reprogram the computer (PCM).

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