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-   -   Trying to understand fuel trim... HELP (http://986forum.com/forums/performance-technical-chat/83379-trying-understand-fuel-trim-help.html)

elgyqc 05-04-2023 09:22 AM

Trying to understand fuel trim... HELP
 
1 Attachment(s)
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.

The Radium King 05-04-2023 09:57 AM

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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