Idle Stabilizer Valve vs. Aux Air Regulator
06-30-2009, 12:22 PM
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Idle Stabilizer Valve vs. Aux Air Regulator
First, here's what I think from what I've seen on these two parts. The aux air regulator in the 78-86 4.7 Euro, part # 93060610200, has the same function as the idle stabilizer valve #92860616100 in the 83-86 5.0 US... 
Can someone confirm if that's completely wrong or right. Or close, but wrong numbers.
I came across the two items today, and after looking at the PET diagrams came to that conclusion. Anyone that can confirm or say otherwise, please do!
Thanks in advance,
-TS
Can someone confirm if that's completely wrong or right. Or close, but wrong numbers.
I came across the two items today, and after looking at the PET diagrams came to that conclusion. Anyone that can confirm or say otherwise, please do!
Thanks in advance,
-TS
06-30-2009, 01:16 PM
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Similar goal, but very different method.
The aux air regulator is a simple temperature-controlled, electrically-heated air bypass that adds air to maintain the idle speed of a cold engine. It is not rpm-sensitive nor does it have any control function on a warm engine.
The system used on the '85-'86 is quite a bit more complex. From the service info by year for the '85:
The idle speed stabilization system regulates and stabilizes the idle speed. For this purpose an air regulating valve opens a bypass around the throttle.
A certain opening size is produced depending on activation of the valve. Since the air flow sensor senses this additional air the injection rate is also changed accordingly.
The air regulating valve performs the function of an auxiliary air valve and vacuum control in addition to idle stabilization. The idle speed is also regulated when the A/C clutch is energized. The valve has two windings and a limited turning angle of approx. 90°.
Input information (position of idle contact engine temperature and engine speed) are processed in the LH control unit. From the LH control unit the air regulating valve receives a cycled voltage signal which acts on both windings alternately during a positioning period.
This produces opposing rotating forces on the armature. Due to the inertance of the armature the valve is set to a certain angle which is equal to the duty cycle of the applied voltage. With changes in the input signals e. g. change in engine speed the duty cycle for the valve also changes.
A programed nominal speed is compared with the actual speed in the control unit. With help of the valve the air flow rate is then changed until nominal and actual speeds are the same. Nominal speed of warm engine is 680 ± 20 rpm.
The aux air regulator is a simple temperature-controlled, electrically-heated air bypass that adds air to maintain the idle speed of a cold engine. It is not rpm-sensitive nor does it have any control function on a warm engine.
The system used on the '85-'86 is quite a bit more complex. From the service info by year for the '85:
The idle speed stabilization system regulates and stabilizes the idle speed. For this purpose an air regulating valve opens a bypass around the throttle.
A certain opening size is produced depending on activation of the valve. Since the air flow sensor senses this additional air the injection rate is also changed accordingly.
The air regulating valve performs the function of an auxiliary air valve and vacuum control in addition to idle stabilization. The idle speed is also regulated when the A/C clutch is energized. The valve has two windings and a limited turning angle of approx. 90°.
Input information (position of idle contact engine temperature and engine speed) are processed in the LH control unit. From the LH control unit the air regulating valve receives a cycled voltage signal which acts on both windings alternately during a positioning period.
This produces opposing rotating forces on the armature. Due to the inertance of the armature the valve is set to a certain angle which is equal to the duty cycle of the applied voltage. With changes in the input signals e. g. change in engine speed the duty cycle for the valve also changes.
A programed nominal speed is compared with the actual speed in the control unit. With help of the valve the air flow rate is then changed until nominal and actual speeds are the same. Nominal speed of warm engine is 680 ± 20 rpm.
10-13-2009, 01:46 AM
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Wally,
Is the idle stabilizer valve easier to replace, has anyone on the Rennlist detailled the process.
My 87 5 speed, is experiencing idle issues periodically for the first time.
What else should I be checking, as it allows idle to drop right off to a stall.
Alex
Is the idle stabilizer valve easier to replace, has anyone on the Rennlist detailled the process.
My 87 5 speed, is experiencing idle issues periodically for the first time.
What else should I be checking, as it allows idle to drop right off to a stall.
Alex
