Durametric Diagnostic Question

[Porsche Enthusiast]

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"?

[JFP in PA]

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.

[Overdrive]

Sorry to not be posting something contributing to the resolution, but I have to ask just for my own understanding...are you saying that the car was idling for 4 hours?

[Porsche Enthusiast]

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!

[JFP in PA]

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.

[Porsche Enthusiast]

DUDE JFP YOU ROCK! I DOnt have to drop my engine yet, all is not lost, yet...

I REALLY did not want to dive in and drop this engine.. Not ready to tackle that yet...

And do you think that the sensor being out would cause the rattle at start up? Prior I was also getting mediocre starts in first, hesitation, and mediocre GPM. I have the hope that this sensor was dying and this will be the solution. Lets hope anyway.

You definatley deserve a smiley flat six!

[Porsche Enthusiast]

One more really DUM question(Yes I spelled it D U M on purpose). Is left side of the car when you face it from front or back? In other words is driver side left or right?

Bank 2 is driver side of car? aka Driver side is Left? or right Bank? OIver thinking this...?