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Old 05-04-2023, 09:22 AM   #1
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Join Date: Sep 2018
Location: Laval QC
Posts: 521
Trying to understand fuel trim... HELP

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.

Attached Images
File Type: pdf Durametric Boxster Green.pdf (15.3 KB, 23 views)
Arctic Silver 2000 Boxster S - bought with broken engine
Green 2000 Boxster 5-speed
1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)

Last edited by elgyqc; 05-04-2023 at 09:32 AM. Reason: added info
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Old 05-04-2023, 09:57 AM   #2
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Join Date: Apr 2010
Location: Canada
Posts: 3,052
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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