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Old 03-25-2009, 04:41 PM   #1 (permalink)
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My '97 vulcan idles rough when started then smoothes right out at accelleration, then rough again at stop lights. As Ethan posted when I accellerate the tranny catches hard. What do you think, is it the IAC? Can you guys help, please post a pic of where it is located. Is this something I can clean lto save bucks? or do I need to replace the unit. Or is it something different? Thanks for helping I'm not the best backyard mechanic!
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Old 03-25-2009, 05:15 PM   #2 (permalink)
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QUOTE (don2775 @ Mar 25 2009, 05:41 PM)
Quote:
My '97 vulcan idles rough when started then smoothes right out at accelleration, then rough again at stop lights. As Ethan posted when I accellerate the tranny catches hard. What do you think, is it the IAC? Can you guys help, please post a pic of where it is located. Is this something I can clean lto save bucks? or do I need to replace the unit. Or is it something different? Thanks for helping I'm not the best backyard mechanic![/b]
Here's a good place to start

http://www.taurusclub.com/forum/inde...howtopic=59381
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Old 03-25-2009, 07:19 PM   #3 (permalink)
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QUOTE (don2775 @ Mar 25 2009, 04:41 PM)
Quote:
My '97 vulcan idles rough when started then smoothes right out at accelleration, then rough again at stop lights. As Ethan posted when I accellerate the tranny catches hard. What do you think, is it the IAC? Can you guys help, please post a pic of where it is located. Is this something I can clean lto save bucks? or do I need to replace the unit. Or is it something different? Thanks for helping I'm not the best backyard mechanic![/b]

My 03 Duratec engine acted the same way and I discover the rubber hose from the underside of the intake to the PVCvalve had collapsed. Replaced it and the engine runs just fine. Unfortunately, only FORD has this part in my area.

Best of luck.....
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Old 03-25-2009, 07:28 PM   #4 (permalink)
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And you'll see controversy as to whether you replace the IAC or clean it.

Attempting to clean it is cheap and quick and has always worked for me. Others will counsel you to buy an entirely new IAC unit.
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Old 03-26-2009, 11:16 AM   #5 (permalink)
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QUOTE (OldWagon @ Mar 25 2009, 08:28 PM)
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And you'll see controversy as to whether you replace the IAC or clean it.

Attempting to clean it is cheap and quick and has always worked for me. Others will counsel you to buy an entirely new IAC unit.[/b]
Well it's better than starting a whole new controversy...

A question that I have is what's the difference in IAC valves?

Most of the pictures that I've seen of them are a brass coloured pin in a brass coloured drum with a brass coloured spring wrapped around the pin...

The one that is in my car, though, is painted black and has no spring wrapped around the pin...

Here's mine:
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Old 03-26-2009, 11:59 AM   #6 (permalink)
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That's the one I have on the 04... which I just cleaned. I'll report back if it fails.

It's a slide valve actuated by (? I think) a linear motor, about the same a solenoid except it responds more positively. It could just be a solenoid.... The black portion oscillates back and forth.

Other IATs I've seen (Volvo, earlier Taurus) have been rotary valves on little conventional (rotating) motors.
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Old 11-11-2010, 08:06 PM   #7 (permalink)
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For my 98 Taurus it was $50 part at autozone. Worked better after being replaced, but a small vacuum leak proved to be more of the problem.
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