Pelican Parts

Cam sensors

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHCam sensors

Leading reported evidence

Replace cam timing (read position) relative

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Unsuccessful attempts: 1
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Suggestion
The reason for this is twofold: (1) Cam drives all have some degree of slack in them, and (2) the engine has VarioCam, which changes the cam timing (read position) relative to the crank position for optimum power and emissions purposes.
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Cam sensors

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Leading evidence: 'Replace cam timing (read position) relative' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace cam timing (read position) relative' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace worn chain guide and the engine goes back

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
Fortunately, the fix is to replace the worn chain guide and the engine goes back to being normal.
Original post Read captured discussion
Cam sensors

Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace cam timing (read position) relative

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
The reason for this is twofold: (1) Cam drives all have some degree of slack in them, and (2) the engine has VarioCam, which changes the cam timing (read position) relative to the crank position for optimum power and emissions purposes.
Original post Read captured discussion
Cam sensors

Replace worn chain guide and the engine goes back

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Fortunately, the fix is to replace the worn chain guide and the engine goes back to being normal.
Original post Read captured discussion
Cam sensors

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Pelican Parts: 1 discussions

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Generation: 20261026T063944Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I am wondering if anyone or how common it might be to have a cam position sensor give incorrect values. I have a 996 with PIWIS telling me the cams are both way of of spec but have measured and they are absolutely in spec.

POST 2Original post

The PIWIS system measures two cam position values: cam position and cam deviation. The reason for this is twofold: (1) Cam drives all have some degree of slack in them, and (2) the engine has VarioCam, which changes the cam timing (read position) relative to the crank position for optimum power and emissions purposes. Because of this, when the engine is running, the cams are nearly always somewhat off ideal installation position, and Porsche sets this deviation range at +/- 6 degrees. If the cam(s) exceed this value range, most likely one or more components have worn a bit, allowing the cam to move more than it should, and this is a common issue, particularly on the five chain version of the engine. Fortunately, the fix is to replace the worn chain guide and the engine goes back to being normal.

POST 3 / ORIGINAL POSTEROriginal post

Thank you for the answer but I think I need to rephrase the question. This is in a GT3. I am seeing clearly wrong values I.E. 0 deviation at 2000rpm but 20. At idle. Actual angles are also clearly wrong. So I am thinking somehow the sensors are mistriggering.

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