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Trying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHTrying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Clean maf just

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I cleaned the MAF just before taking these readings and the camshaft deviations are steady but on the limit at -6.92 and -5.81.
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Leading evidence: 'Clean maf just' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean maf just' (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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Run there

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your deviations seem typical - i ran there for a long time.
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Trying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Disconnect recently

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Suggestion
however, was battery disconnected recently?
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Trying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Clean maf just

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Performed · outcome unconfirmed · Original poster
I cleaned the MAF just before taking these readings and the camshaft deviations are steady but on the limit at -6.92 and -5.81.
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Trying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Disconnect recently

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Suggestion
however, was battery disconnected recently?
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Trying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run there

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Read evidence and context

Discussions that performed work without a confirmed outcome: 1

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your deviations seem typical - i ran there for a long time.
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Trying to understand fuel trim... HELP - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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POST 1 / ORIGINAL POSTEROriginal post

The power is not what it should be in my 2000 base 5-speed so I have been trying to diagnose the problem with my Durametric by looking at the fuel trim data. From what I have read and seen the numbers that I have on the attached document look good. The variocams kicked in when I blipped the throttle up to 3000 RPM. Am I reading this wrong? I cleaned the MAF just before taking these readings and the camshaft deviations are steady but on the limit at -6.92 and -5.81.

POST 2Original post

your deviations seem typical - i ran there for a long time. your engine codes at 9 iirc. your fra (load) numbers look excellent - can read anywhere between 0.7 and 1.32 before you code so .99 is about as good as it gets. your rkat (idle) numbers appear ok as well - they are a % (as opposed to fra which is a discrete value) so .61% trim is good. (you can swing between +/-4 before code).. however, was battery disconnected recently? it takes a while for long-term trims to reestablish themselves.

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