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IAC from China/Germany?
Hola Pelicans,
I keep seeing these idle control valves on ebay for about 60 - vs the Bosch ones that are like... 400-700. Seems to me like a fairly simple part and a 60 price point is almost a no-brainer - what are the chances it will fry your DME? Has anyone tried these? My IAC bench tests OK, but I get the feeling it isn't working optimally all the time. 60 bucks makes a great way to quickly test it and not care about the money. Cheers.
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1986 Carrera Coupe - 1987 W124 300E - 1999 Land Cruiser 100 - 2021 GLA250 |
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02-23-2017, 06:33 AM
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Join Date: Aug 2008
Location: sectors R&N, SE Pa
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I don't know anything about the IAC model, but there are 2 coils/servo solenoids in the ICV in series. At the common point (the center connector pin) to either outer pin, you should read 20 ohms or so. Across the outer pins, you should read the total (40 ohms).
The DME provides +12V to the center pin, and alternates switching the each coil by providing a (Pulse width modulated / PWM) ground by switching a dedicated transistor (open collector) to each side, hence the vibration you can feel. If one of the ICV coils short, you could take out one of the 2 DME drive transistors, but they are replaceable with some basic soldering skill. That is the only risk/failure mode I am aware of. Others may chime in.
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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02-23-2017, 06:57 AM
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Quote:
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1986 Carrera Coupe - 1987 W124 300E - 1999 Land Cruiser 100 - 2021 GLA250 |
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02-23-2017, 06:59 AM
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Oh no prob (I actually thought that was a brand)
BTW, I don't know the most typical failure mode, I think most ICVs just open up. Then you don't get good idle control of course, but this alone doesn't harm the DME like a short (rare) might.
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue Last edited by steely; 02-23-2017 at 10:15 AM.. |
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02-23-2017, 10:13 AM
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Member 911 Anonymous
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M, don't do it, I contacted the China ones to ask them to give me the OHMS on the three poles. They replied, " this product will not work for you" LOL.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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02-23-2017, 10:20 AM
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1986 Carrera Coupe - 1987 W124 300E - 1999 Land Cruiser 100 - 2021 GLA250 |
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02-23-2017, 10:50 AM
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Gilles & Kathy Happiness is not having a Porsche in the garage... Happiness is having a Porsche on the road!  86 Porsche 911 Cabriolet, 2011 BMW 1200RT, 03 Saab 93 Cabriolet, 06 MB E350 Estate |
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02-23-2017, 10:52 AM
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Member 911 Anonymous
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Darn Main Land Chinese, they hate me
. ABC's love me though :-P
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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02-23-2017, 11:02 AM
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Carrera
Marble Grey
Car with no name
