14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHEngine misfires, need diagnostic ideas...
Leading reported evidence
Combined work: Replace oil/air separator bellows and it was + Run like a champ
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
My CEL has been on for a few days but has historically been a MAF issue that comes and goes. I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Performed · outcome unconfirmed · Original poster
I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months. However, the constant state CEL returned and then left and returned again recently.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Read full discussion summary
Leading evidence: 'Combined work: Replace oil/air separator bellows and it was + Run like a champ' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'ignition coils' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Combined work: Replace oil/air separator bellows and it was + Run like a champ' (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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
Alternator was replaced around the same time frame due to catastophic failure.
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months.
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
Plugs were changed about 10k miles ago and the coil packs were inspected.
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Combined work: Replace oil/air separator bellows and it was + Run like a champ
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
My CEL has been on for a few days but has historically been a MAF issue that comes and goes. I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Performed · outcome unconfirmed · Original poster
I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months. However, the constant state CEL returned and then left and returned again recently.
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
Agree with Redridge...at least to keep it cheaper and more positive....I had similar syptoms when I picked up my 996 shipped from New York...turned out to be a bad coil on one cylinder....felt like it was running a few cylinders short, but would run...but felt like something holding it back.
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
Agree with Redridge...at least to keep it cheaper and more positive....I had similar syptoms when I picked up my 996 shipped from New York...turned out to be a bad coil on one cylinder....felt like it was running a few cylinders short, but would run...but felt like something holding it back.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
ignition coils
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.
Suspected cause
Agree with Redridge...at least to keep it cheaper and more positive....I had similar syptoms when I picked up my 996 shipped from New York...turned out to be a bad coil on one cylinder....felt like it was running a few cylinders short, but would run...but felt like something holding it back.
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.
14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 2 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T065735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My CEL has been on for a few days but has historically been a MAF issue that comes and goes. I thought I had cured it by replacing the oil/air separator bellows and it was running like a champ for several months. However, the constant state CEL returned and then left and returned again recently.
While cruising at about 75mph and about 3 hours into my trip, the car hiccups and the CEL starts flashing. Engine feels rough, almost as if I was running over bad pavement. Got off of the interstate at the next exit and the car cuts off as soon as the RPM's drop. Fortunately was able to get to a gas station and do some inspection. No fluids from the bottom of the engine. The coolant levels appear OK and the oil level and color is perfect. I suspected the MAF so I pulled the plug to force the car into limp mode so I could find a NAPA. Car would not start at first but finally did and ran but needed to be coaxed to run. Would not idle at all. Very rough running.
Nursed her to an Advance auto to get the codes read and came up with a MAF code ( as expected esp, after unplugging it), multiple misfires, add'l codes for misfires on cylinders 1, 2, and 3, and an evap canister purge valve misfire code. Cleared the codes, plugged the MAF back in, and restarted to see what she'd do. Started but would not hold idle again. Clearly misfiring. Pulled the codes and the MAF was gone but the evap code remained and it was showing several misfires.
Nursed her to the Porsche dealer, such as it is here, and left her for diagnosis tomorrow.
Car is a 99 c2 with regular service. Plugs were changed about 10k miles ago and the coil packs were inspected. Did not find any indication of cracking or other failure. Alternator was replaced around the same time frame due to catastophic failure. Car is a daily driver and has a little over 126,000 miles.
Any ideas or suggestons?
misfires on one bank could be really bad but lets skip that.
evap purge valve sticks open its a big vacum leak, that could difantly casue your problems
being you have a fault p0441 i would guess?
Agree with Redridge...at least to keep it cheaper and more positive....I had similar syptoms when I picked up my 996 shipped from New York...turned out to be a bad coil on one cylinder....felt like it was running a few cylinders short, but would run...but felt like something holding it back. Hope it's some thing like that and not the $11K hit.
Best of luck.........Chuck
Thanks guys. Transporting it back home in the next week so I can get my local dealer to look at it. The monkeys here are saying bent valve from overrev. Not. I'm suspecting either a vacuum leak or a variocam failure. We'll see.
p0300 p0301 p0302 p0303 p0441 from the sounds of it, this sounds like soemthing a lil out of the reach of a home mechanic may be time to take it to a pro
Brad, the 'pros' were the ones that gave the above diagnosis. They are awful anxious to get 10k out of my wallet. So, she's going back home for someone more reliable to look at it. And someone that isn't going to try to put a large rotating device in my hind end.
gixxer, I'm going to retrieve the car from BFE this weekend. Hopefully, I'll have a more accurate diagnosis when I get her back home. I'll be sure to update when I have what I consider a reliable analysis.
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