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Old 01-27-2018, 11:32 AM   #1
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Camshaft problems?

I had my 2002 Boxster 2.7 base die while idling at a red light. After several tries, it started and ran rough. I limped it home. Read codes of 300,301,302,303,343. Cleared them and restarted and still shows 343 camshaft position sensor bank 1 exceeds value. Still runs rough. Durametric has cam deviation for both banks as 0. Actual value for camshaft bank 1 is 0. Actual value for bank 2 is -12.92. Can anyone tell me what these numbers mean? Could this just be a bad cam position sensor or is there something else I can check?
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Old 01-27-2018, 03:14 PM   #2
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Originally Posted by Fred111 View Post
I had my 2002 Boxster 2.7 base die while idling at a red light. After several tries, it started and ran rough. I limped it home. Read codes of 300,301,302,303,343. Cleared them and restarted and still shows 343 camshaft position sensor bank 1 exceeds value. Still runs rough. Durametric has cam deviation for both banks as 0. Actual value for camshaft bank 1 is 0. Actual value for bank 2 is -12.92. Can anyone tell me what these numbers mean? Could this just be a bad cam position sensor or is there something else I can check?
​​​​​​​thanks
It is most likely all caused by the one sensor acting up. You need to go hands on and determine if it needs to be replaced or is just disconnected (wiring harness issue).
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Old 01-27-2018, 05:32 PM   #3
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I put a new AOS on it about 3-400 miles ago. Is it possible I pulled something loose? Isn’t the cam sensor pretty much under the AOS?
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Old 01-28-2018, 02:27 AM   #4
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You are way out of specs, so an alert is triggered.
Probably variocam wear
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Old 01-28-2018, 12:09 PM   #5
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Some of us have changed the variocam pads resulting in the camshaft timing numbers not changing more than a degree or 2, and in some cases, not at all.
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Old 01-28-2018, 12:12 PM   #6
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Next step is to examine the oil and filter for metal.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
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Old 08-12-2018, 01:54 PM   #7
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I finally had time to dig into this. I took off the aos to get a look at the wiring. Everything looked ok and the voltages checked out ok. I went ahead and replaced the cam position sensor just to be safe. I put everything back and it seems to run a little better but still rough at idle. CEL comes on after a few minutes with the same P0343. I checked the cam timing for bank 1 and it looks like it's maybe a tooth off. Suggestions on what I should do from here?

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