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Macgyver55

Fellow mechanics

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Maybe you guys can help me out. I have a 99 Taurus here with a code p0411....secondary AIS incorrect flow. This is a charity case...(college friend of my daughter) so no money of course. I disconnected and checked both diverter valves manually and applied vacuum and the seem to work fine. Both vacuum and pressure hoses look good. I also went as far as removing the pump and bench testing the pump motor which also runs fine. The only other components involved that I see are a vacuum switch (tough to get at) and a sensor on the pump mount. Anyone have any common finds on these or any other suggestions before I get too involved in this?

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Thanks Jer, I don't mind helping him out, I'm just trying to minimize my time involved. I'm off Monday, so it would be Tuesday before I can find anything out at work.

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The most comon with air on these is either a bad pump, or a bad pump relay, does the pump work? I will be able to check it out more in the am.

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As I said, I pulled the pump and bench tested it. It ran and sounded good. Do you know what the relay runs price-wise?

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Not off hand, I will do some investigating in the morning.

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Is this a 3.0 Flex Fuel car? If so there is a pcm update that may take care of it. If it is just the 3.0 Vin U, then make sure there are no vacuum leaks, if you have a scan tool make sure the o2's arent reading lean before the pump kicks on, the front o2's are reading lean the pcm wont devert the air to the cats, to prevent an over lean condition. If the o2's look good, run the air pump and see if they go to lean after the pump is running.

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As I said, I pulled the pump and bench tested it. It ran and sounded good. Do you know what the relay runs price-wise?

I sent you an email of the electrical circuit.

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Is this a 3.0 Flex Fuel car?

Yes it is, as a matter of fact. I was concerned that may have something to do with it.

Thanks for the info....and the diagram!

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Sounds like 4 has you set up. I read through the diagnostic chart and think it might not be bad for you to read through it yourself as there are a couple of steps that are time sensitive.

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