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What could this "blip" be?

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9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHWhat could this "blip" be?

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Test would be

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Suggestion

A good test would be to bring the RPMs to +4500 and see if it happens at that speed.

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Leading evidence: 'Test would be' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test would be' (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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Test would be

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

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Suggestion

A good test would be to bring the RPMs to +4500 and see if it happens at that speed.

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What could this "blip" be?
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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.

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

  • Rennlist: 1 discussions

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Generation: 20261027T144324Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all, I have noticed recently a "blip" or hiccup--a sort of really quick misfire, although I hesitate to call it a misfire--as I cruise along the freeway in 6th gear at around 3k RPM. It happens randomly and there seems to be no drivability problems with the car, a 2003 911 with about 12k miles on it. I bought the car 3 weeks ago with about 10,800 miles on it, and it is my first Porsche. I'm wondering if this is just a characteristic of the way these engine management systems work or if it indicates something a bit more sinister. Any thoughts or ideas? Thanks! Deano

POST 2Original post

Is it around 3000 to 3200 RPM??...Could be variocam..need more info

POST 3Original post

If it's around the 3k mark, I'm sure klirgt is right to say it's the Variocam engagement.

POST 5 / ORIGINAL POSTEROriginal post

Thanks guys. Your suggestion that it could be the variocam gave me something to search on and, from several other posts, it seems this is common and normal. Deano

POST 7Original post

Quotes source post: 4742968

Variocam - Variable valve timing ('99-'01 996's) Variocam plus - Variable valve timing and lift ('02-'04 996's) http://wheeltalk.fancal.net/?p=366

POST 8Original post

A good test would be to bring the RPMs to +4500 and see if it happens at that speed. That’s well after the variocam engagement point.

POST 9Original post

Yeah - at about 3200 rpm, the hydraulics kick in and the valves lift higher. Definite bump at that point. Entirely normal, but I still try to avoid cruising at that speed to avoid constantly engaging the mechanism. One guy on the board here runs 15-50 weight oil an dhe says it dampens the effect. Not recomended though.

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