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YOUR RESEARCHNeed Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Disconnect over night
Performed · outcome unconfirmed
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Performed · outcome unconfirmed
You can do a hard reset by disconnecting both battery terminals and touching them together, then leaving them disconnected over night.
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Disconnect over night' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check usual suspects, aos, oil filler tube, intake plumbing' (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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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Check the usual suspects, AOS, oil filler tube, intake plumbing before the intake plenums, evap system.
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect battery terminals and touching them together
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Suggestion
You can do a hard reset by disconnecting both battery terminals and touching them together, then leaving them disconnected over night.
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect battery would clear everything as well
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Suggestion
It seems like disconnecting the battery would clear everything as well.
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace aos, i just
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Suggestion · Original poster
I have just redone my cam chain pads etc., I just changed the AOS, I just replaced the oil filler tube, I just replaced the venturi tube, and a new coolant tank (which is unrelated but I thought I would mention it as it was such a b'tch to do)
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace aos, i just
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I have just redone my cam chain pads etc., I just changed the AOS, I just replaced the oil filler tube, I just replaced the venturi tube, and a new coolant tank (which is unrelated but I thought I would mention it as it was such a b'tch to do)
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace oil filler tube, i just
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 · Original poster
I have just redone my cam chain pads etc., I just changed the AOS, I just replaced the oil filler tube, I just replaced the venturi tube, and a new coolant tank (which is unrelated but I thought I would mention it as it was such a b'tch to do)
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reset adaptive and your fuel trim values will be accurate
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
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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
A handover will reset the adaptive and your fuel trim values will be accurate for the current engine conditions, otherwise you are looking at the past.
Need Cliffs notes on fuel trim and RKAT on the Durametric - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
2 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
I've done the hard reset but I'm still getting the RKAT close to 4.
Okay smart guys and Porsche forum mentors,
I've grasped the concept of fuel trim (both short and long term) thanks to this great video (
https://www.youtube.com/watch?v=5WnM_NsOtd8&feature=youtu.be
) and hooked up my trusty Durametric to see these results:
Sooo..., What exactly is this telling me?
I have just redone my cam chain pads etc., I just changed the AOS, I just replaced the oil filler tube, I just replaced the venturi tube, and a new coolant tank (which is unrelated but I thought I would mention it as it was such a b'tch to do)
Any thoughts?
Its a term used to define a "reboot" of the ECU. Google it for details.
Basically if you do a ton of work to an engine that has a few small issues that the fuel trim has been "masking" the ECU doesn't know when those items are corrected. It will continue to "adapt" to the prior conditions, and it does this through fuel trim primarily.
A handover will reset the adaptive and your fuel trim values will be accurate for the current engine conditions, otherwise you are looking at the past.
I saw somewhere if you clear all codes with the durametric it erases the long term fuel trim and then begins the process of relearning them. Maybe worth a shot? I did it one time while idling the car to clear a code and the car definitely started running differently the instant I cleared them. It seems like disconnecting the battery would clear everything as well. To readapt the egos I think you put the key in and turn to on and wait like a minute and then turn it back off, all without touching the gas.
Clearing the codes is always able to make for a quick change in the engine idle and low speed characteristics. This is not a handover.
You can do a hard reset by disconnecting both battery terminals and touching them together, then leaving them disconnected over night. This is similar to a handover in its results.
A handover can be done by any shop with a PIWIS or Autologic system.
Good. I'll try the "hard reset" approach to start with. I still need to change the fuel tank purge valve and do a general vacuum leak test or smoke test to finish my current intervention. Thanks for the tip.
Look at your MAF readings at correct rpm (about 740), motor fully warmed up. I don't know what the MAF spec is for an S, but for the 2.7 its 15 kg/min +/- 1.5.
If you have significantly low MAF values, then its probably likely you have a vacuum leak. Check the usual suspects, AOS, oil filler tube, intake plumbing before the intake plenums, evap system.
MAF is bang on 15. FRA is at 0.98.
I've done the hard reset but I'm still getting the RKAT close to 4.
I've not done the purge valve yet (waiting for the part) nor the smoke test.
This morning I have codes P0430, P0410, and P1411.
Things are getting worse, not better. Hopefully the leak test will show something.
Success!
Found a leak in the rubber collar that holds the intake plenum to the manifold. Gear clamp on crooked. Spray test confirmed it. Fixed it and now I get this:
Happy camper!
This is a source reference. Confirm exact model applicability in the original material.
