4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHMisfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Disconnect battery
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
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 also tried disconnecting the battery for an hour and doing the key procedure (1 minute ignition on without engine on, remove key 10 seconds, start) to reset the ECU, also to no avail.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Disconnect battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect battery' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
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.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reset ecu, also
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
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 also tried disconnecting the battery for an hour and doing the key procedure (1 minute ignition on without engine on, remove key 10 seconds, start) to reset the ECU, also to no avail.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run peachy
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
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
Now, I know whatever was causing this was previously being compensated for by the DME, because it was running peachy before I cleared the codes, idling smoothly with A/C on or off, and all around behaving itself.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run severely lean or rich
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
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
Any information would be greatly welcome, as of right now I'm afraid to run in whatever state of tune is causing such a severe misfire, as I don't want to be running severely lean or rich for that long.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (7)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Disconnect battery
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 also tried disconnecting the battery for an hour and doing the key procedure (1 minute ignition on without engine on, remove key 10 seconds, start) to reset the ECU, also to no avail.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reset ecu, also
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 also tried disconnecting the battery for an hour and doing the key procedure (1 minute ignition on without engine on, remove key 10 seconds, start) to reset the ECU, also to no avail.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run peachy
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
Now, I know whatever was causing this was previously being compensated for by the DME, because it was running peachy before I cleared the codes, idling smoothly with A/C on or off, and all around behaving itself.
Misfire after clearig CEL - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run severely lean or rich
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
Any information would be greatly welcome, as of right now I'm afraid to run in whatever state of tune is causing such a severe misfire, as I don't want to be running severely lean or rich for that long.
Misfire after clearig CEL - 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.
4 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.
I was getting codes P1124, 1126, 1128 ad 1130 on my 1998 mauak, so I tried blocking off the line to the vacuum cannister/SAI loop to troubleshoot it, I confirmed no leaks in my patch on the plenum, and the car was running well. That is, until I cleared the check engine light.
As soon as the light was cleared, the car wouldn't idle anymore, running with a severe misfire. After a minute of keeping it afloat to see if the DME was adapting, I got a flashing CEL for misfires on all of bank 1. (0300, 0301, 0302, 0303)
Now, I know whatever was causing this was previously being compensated for by the DME, because it was running peachy before I cleared the codes, idling smoothly with A/C on or off, and all around behaving itself.
Does anyone know what might be happening here? This is my daily driver, I only did what should have been a simple and easily reversible procedure, and now I'm dead in the water. Any information would be greatly welcome, as of right now I'm afraid to run in whatever state of tune is causing such a severe misfire, as I don't want to be running severely lean or rich for that long.
I tried reconnecting SAI, and that didn't help.
I also tried disconnecting the battery for an hour and doing the key procedure (1 minute ignition on without engine on, remove key 10 seconds, start) to reset the ECU, also to no avail.
It seems pretty clear to me that I didn't fix the problem I had previously, but what's more clear is that there's a new problem, and I can't begin to imagine what it is, other than the car having previously adapted to the small vacuum leak and now being completely unprepared for it.
I'll have to drive the wife's car to work for the foreseeable future, it seems.
Try unplugging your MAF sensor and see if it will idle and run smoothly.
When you unplug the MAF sensor if forces the DME to a default fueling strategy.
If you have a vacuum leak causing the issue the engine will not idle well on that default fueling strategy.
Thanks, I'll try that when I get home. If I don't have any luck, I'll proceed with teardown of my intake plenum, I have the blanking plates to delete the SAI loop under it and then I'll get a chance to closely inspect the whole vacuum system while eliminating the cannister and associated rat's nest. Hopefully, that whole process solves it or at least gives me some clues. If not, coils/plugs are next, and then AOS. Last time I tried to troubleshoot, it got worse without the MAF, but we'll see what it does with the vacuum line blocked off.
This is a source reference. Confirm exact model applicability in the original material.
