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Old 05-13-2020, 04:30 PM   #1
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Cam Deviation M96 2.5

I checked my cam deviation today and noticed something strange, when I plug it in and checked it cold it sits -6.0 for cam bank 1 and -3.0 bank 2. The thing I find weird is when it gets hot it doesn’t change. Then later in the day I changed my battery and checked it again and it was -5.0 bank 1 and -3.0 bank 2 and then when it got warmed up again it jumped back up to -6.0 just find it weird it’s not like -5.72 or even -6.01 why is it changing by ones. Was hoping someone can clear this up for me, I will be doing my vario pads shortly.

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Old 05-14-2020, 06:05 PM   #2
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My 98 reads -6 on one bank. Car running or not. Hot or cold. Doesn't matter. I'm pretty sure the Durametric doesn't read that bank for some reason.
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Old 05-15-2020, 09:01 AM   #3
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My 98 reads -6 on one bank. Car running or not. Hot or cold. Doesn't matter. I'm pretty sure the Durametric doesn't read that bank for some reason.
I’m still planning on doing wear pads just in case but I just wanted to see what other people are seeing.
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Old 05-15-2020, 09:57 AM   #4
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I think on the early 2.5 engine there was only a sensor on one bank for reading cam deviations. Have a look at the following thread for a similar discussion:

https://986forum.com/forums/performance-technical-chat/60141-cam-shaft-deviation-986-a.html

Hope you get it sorted.
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Old 05-15-2020, 07:04 PM   #5
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Originally Posted by ccjazz View Post
I think on the early 2.5 engine there was only a sensor on one bank for reading cam deviations. Have a look at the following thread for a similar discussion:

https://986forum.com/forums/performance-technical-chat/60141-cam-shaft-deviation-986-a.html

Hope you get it sorted.
That’s very helpful thanks! I do notice I am using the newest version durametric and also have cam bank 2 showing. -3.0
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Old 05-23-2020, 04:09 PM   #6
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My 2001 2.7 had a similar problem, and it had a bit of a rattle on start up. A Porsche mechanic told me my IMS bearing was going and I shouldn’t drive the car and get the bearing changed immediately. So I pulled the engine out and took the IMS out, guess what the bearing was perfect, not even the slightest play or wear, unfortunately it had to be replaced with a new one after pulling it out. So what was the rattle? Well I pulled the Timing Chain Tensioners out (3 of them) and sure enough 2 of the 3 weren’t holding pressure, so I decided to change all 3. Then I decided while I had the engine stripped own this far I should looked at the tensioners paddles and the ‘Variocam’ tensioners. The timing chain tensioner paddles were fine with hardly any wear, I’m guessing because the ‘Tensioners’ weren’t working properly they weren’t forcing the timing chains onto the paddles so they didn’t really wear. But the biggest surprise was the ‘Variocam Tensioners’, they were both stuffed! And after pulling them out I decided to cut them in half (they’re a sealed unit) to see what had happened. When I cut them open the first thing I noticed was the deterioration of the ‘O’ rings, and there was thick phenolic seal that had worn the case hardening on the bore of the tensioners, and this affected the operation of the Tensioners. After replacing all 3 timing chain Tensioners and the 2 Variocam Tensioners plus the wear pads on the Variocam Tensioners, the car was like new again, NO rattle on start up and when I took it for a run I noticed straight away the ‘increase’ in low down ‘torque’, it was truly astounding what a difference it made to the car’s performance!
The variocam tensioners and timing chain tensioners are as big if not a bigger issue than the IMS. As I said with 150,000kms on my Boxster, the IMS was in perfect condition, but the tensioners were shot!
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Old 05-25-2020, 08:35 PM   #7
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Liamray,..did you check cam deviation's by chance,..

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