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#1
01-20-2009, 10:44 AM
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Rough Idle Help Identifying Function of Part
I have been experiencing a rough idle the past month. I have tried a few things...clean Idle Control Valve....clean injectors...check for vaccum leaks. There is a part in the manifold that does some kind of air flow control. The part is called an "Adjuster Unit" and it is identified by part number 7 in the attached diagram. Does anyone know what the function of this unit is and what are the operating conditions? It has a rotating vane that closes off or enables more air in the manifold, but I am trying to understand how this finctions and what operating conditions control the operation.
Any help would be appreciated. Thanks. 
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#2
01-20-2009, 12:20 PM
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That butterfly changes the length of the runners on the intake. It could effect idle, but is less likely than the other things you mentioned, or even spark and fueling problems at idle. When you take off the adjuster unit, what do you see in the intake manifold? Hint: it should not be oily.
__________________
2001 E53 3.0 5pd
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#3
01-20-2009, 02:54 PM
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I have found a little more on the operation of the valve. If someone can tell me...at idle....is the valve open or closed? Also, at idle, is the solenoid that engages the valve energized or non energized.....+12 present or ground?
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#4
01-20-2009, 11:18 PM
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Quote:
But at idle it would be closed. It opens at higher rpms under load. You can easily remove it with 2 t-40 headded screws that hold it to the manifold for inspection. The only way it would really affect idle would be if the flap was broken, which only really happend if you have a decently bad intake pop from lean conditions.
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#5
01-21-2009, 10:35 AM
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Thanks for your reply. That is what I thought. At idle it seems to be open..not closed. By open I mean the flap is in a horizontal position with the solenoid not energized. I will have to do a resistance test on the solenoid coil and the n do a test by trying to energize the coil to see if it operates.
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#6
01-20-2009, 03:21 PM
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Perhaps you are getting bad fuel. You may wish to do a Techron treatment for the next the times you fill up with gas.. If it is bad fuel, that will eliminate the problem and your idle should return back to smooth.
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#8
01-20-2009, 03:41 PM
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any codes? tried cleaning MAF?
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#9
01-20-2009, 03:55 PM
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Quote:
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