08-14-2011, 09:00 PM
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#1
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Registered User
Join Date: May 2011
Location: San Antonio
Posts: 32
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TMM-- Thanks that was what I was afraid of. I was hoping it might be a sensor or a wire issue. So is this a definate or is there anything I need to rule out first?
I finally bought a low profile hi lift jack today, Am I understanding correctly I need to drop the engine if this "bank 2"vario has gone kaput?
Anyone else please chime in with a second opinion/option, please!
Back in the day I could drop a VW bus engine in 12 minutes flat, somehow I am thinking this will not be so simple, I am sure...
Flat 4 VW Smiley
Flat Six Porsche Smiley
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08-15-2011, 09:49 AM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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In the image you have, it does not appear that you have "selected" the cam deviation values (note the checks in the boxes below). The Durametric software is very capable, but takes some getting used to......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-15-2011, 11:17 AM
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#3
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Registered User
Join Date: May 2011
Location: San Antonio
Posts: 32
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JFP, I was looking for you...
No we checked cam 1 Deviation, worked fine...
Look close there is NO Cam Deviation 2 listed... Thats my problem... Doesn't make sense unless the actuaor is electronically "dead"?
Last edited by Porsche Enthusiast; 08-15-2011 at 11:20 AM.
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08-15-2011, 12:18 PM
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#4
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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The actuator is not the source of the signal. The cam position sensors tell the DME where the cams are in realation to the output of the crank sensor. I'm not sure why the Durametric does not see the other sensor, but it could be fried or disconnected.
Each cylinder head has one, item #34 in the attached:
Shown here is the camshaft position sensor. There is one located on the top of the left cylinder head towards the front, and one on the right cylinder head towards the rear for the 5-chain motors used up to about 2001. For 2002 and later 3-chain motors, the sensor is located on the top of the left cylinder head towards the rear, and on the right cylinder head towards the front.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-15-2011, 02:03 PM
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#5
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Opposed to Subie Burble
Join Date: Mar 2007
Location: Central CT
Posts: 1,197
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-O/D
1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
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08-15-2011, 03:32 PM
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#6
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Registered User
Join Date: May 2011
Location: San Antonio
Posts: 32
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Over Drive, I meant engine not running, sitting quietly, not "idling". Initially I assumed the sound was from oil draining and it maybe it was just lifter chatter at first.
JFP, so I don't have to give up hope!
I found the same picture from pelican and checked the wiring, but I wasn't sure if the sensor was why no dev bank 2 on Durametric.
So it is that sensor that would send out the cam 2 deviation, meaning that is what I should do now, replace that sensor? And its easy too since it is bank 2 right behind the driver seat side of the engine?? Please say yes, that it will at least spare me for now dropping my engine!
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08-15-2011, 06:50 PM
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#7
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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The way the system works is the crank position sensor data is compared to the individual cam position sensors, and the “deviation” value is determined by an algorithm in the DME mathematically. The readout value is how far it is off “ideal”.
There are two cam position sensors, one on each bank, and I believe they are interchangeable, as well as being testable (they are a simple Hall Effect sensor that generates a signal when a ferrous alloy shutter passes nearby). You should be able to bench test the suspect, or swap them around to see if the reverse occurs. They cost between $70 and $150 each, aftermarket vs. OEM.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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