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Well, this error, which had happened infrequently in cold weather at startup a couple of times now happened in relatively warm 45 degree weather. Based on that it looks like it's time to replace the sensor but is there any reason to replace them both? I've just turned 110K and it doesn't look like too bad a job.
Well, this error, which had happened infrequently in cold weather at startup a couple of times now happened in relatively warm 45 degree weather. Based on that it looks like it's time to replace the sensor but is there any reason to replace them both? I've just turned 110K and it doesn't look like too bad a job.
Somehow I don't think this is a sensor caused error. That would show something like "Improbable signal.." - I'd much more suspect the solenoid that controls the oil flow to the Variocam adjuster. Or the filter to that solenoid. Does it tell you which bank is slow?
Mine always seems to happen in cold weather startup and is fairly intermittent. My first occurrence was last October followed by January with the most recent in March.
Mine always seems to happen in cold weather startup and is fairly intermittent. My first occurrence was last October followed by January with the most recent in March.
What weight and type of oil are you using? And what's "cold"..?
I run M1 0-40 and cold, in this case, is below freezing but above 20 F. It's been about 6K miles since the last change but it's happened earlier in the same oil change. I've run the same for about 4 years with early oil changes so nothing has really changed in that sense.
Engine oil pressure too low -->(e.g. Oil dilution, Oil thickening Oil quality incorrect, Oil pressure control or Oil pump Faulty)
Camshaft adjustment Faulty
Intake camshaft stuck
Fault setting condition(s)
Deviation Actual value - Nominal value > 10°Intake camshaft
or
Adjustment Intake camshaft slow
Did you notice what the first possible cause is? The possible faults are usually given in order of possibility.. (most probable first.) I'll repeat what I think I said before - there IS a filter on the input of the solenoid, at least on early 958 V8's, and it has been known to get plugged up causing slow response. THAT is where if it was me - I'd look first. Unfortunately - it's located under the valve cover so it's a bit of a chore to get to (and you should replace the valve cover gaskets - all of them - if doing this job..)
Ok, here's my oil specs amsoil European 5w-40. Mine happens in weather above 40 Fahrenheit. Always after startup. Maybe 5 minutes into the first drive.
Since mine happens at startup it does make sense that it's an initial pressure related problem. A partially clogged screen could do that until there's enough pressure to overcome a partial blockage. Since the frequency is so low and not very repeatable I may wait a bit instead of shotgunning the solution.
Since mine happens at startup it does make sense that it's an initial pressure related problem. A partially clogged screen could do that until there's enough pressure to overcome a partial blockage. Since the frequency is so low and not very repeatable I may wait a bit instead of shotgunning the solution.
What both of you might consider is doing some short-change interval oil changes. I might suggest adding CD-2 oil-detergent additive to the oil about 500 miles before the oil change. It worked wonders on some BMW motorcycles that used to gum up a sprag-clutch. As I mentioned - this isn't a new problem. Others have experienced it - and either replaced the solenoid (that actually also changed the filter) or simply cleaned the filter. It's more like a strainer.. From memory - Porsche eliminated the strainer on later models.
Note there are 3 versions of the Actuator Camshaft - that means production revisions. The highest last number is the current version, probably without a strainer. https://www.sonnenporscheoemparts.co...ve-94810530407
The valve isn't cheap ($300 or so) and getting to it isn't simple - so using some CD2 oil detergent (make SURE it's the "detergent" not oil additive) might well be worth a try, especially if you haven't owned the car from new and don't have any history on past owners oil change habits.
It looks like that valve lives between the cams. I haven't had a valve cover off yet. Or seen a picture of one removed.
But I did do an amsoil oil flush before my last oil change. And will probably do it again. I am very very leary about adding anything to the oil. Or to the fuel system for matter. Who knows..... The flush may have caused the problem. Would be very easy to have freed some detritus that plugged the darn thing. I will look into the detergent you recommended.
It looks like that valve lives between the cams. I haven't had a valve cover off yet. Or seen a picture of one removed.
But I did do an amsoil oil flush before my last oil change. And will probably do it again. I am very very leary about adding anything to the oil. Or to the fuel system for matter. Who knows..... The flush may have caused the problem. Would be very easy to have freed some detritus that plugged the darn thing. I will look into the detergent you recommended.
What does an Amsoil oil flush consist of? And yes - it might have been the cause of your problems, especially if oil changes had been neglected.
03-18-2019, 06:14 PM
P000C - Intake cam position slow
