8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRough idle, check engine light
Leading reported evidence
Replace aos is original, water pump
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Replace aos is original, water pump' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check engine, drive' (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.
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Discussions that contain suggestions
1
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Suggestion · Original poster
-got "check engine, drive to workshop light" - I took it to my Indy and the codes included misfire cyl 4, 5, 6 and running lean
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Suggestion
I suggest you go in and removed the alternator and check those evap lines.
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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Use scan tool.......sometimes just looking at injector
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
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Suggestion
if it was idling rough and all the mechanic did was clear codes you need to find a shop that knows how to use a scan tool.......sometimes just looking at injector on time tells the wrench you have a vacuum leak .there is a long diagnostic tree to follow in some cases for codes .....i guess this shop was busy or you will have to make an appointment and drop it off [costly] .i do not recommend you taking the car apart poking n hoping
Use scan tool.......sometimes just looking at injector
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
if it was idling rough and all the mechanic did was clear codes you need to find a shop that knows how to use a scan tool.......sometimes just looking at injector on time tells the wrench you have a vacuum leak .there is a long diagnostic tree to follow in some cases for codes .....i guess this shop was busy or you will have to make an appointment and drop it off [costly] .i do not recommend you taking the car apart poking n hoping
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.
8 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 · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Car still not idling properly, sometimes slow to start, and at times the pickup does not seem 100%.
Can anyone help diagnose a problem I have had recently? Facts are below -
-2002 996 6 speed with 68k miles
-occasional rough idle when starting the car cold
-got "check engine, drive to workshop light" - I took it to my Indy and the codes included misfire cyl 4, 5, 6 and running lean
-Spark plugs/coil pack are approx 4 years, 14k miles old
-AOS is original, water pump has been replaced. The oil cap is not hard to remove when I untwist it.
-One month ago I had a new oil filler tube installed as my old one had a very small crack in it. The original oil cap was kept and is on the oil tube (I ensured it was tight and ensured the gas cap was tight)
-I added Techron fuel system cleaner last night and drove about 15 miles. I will continue to put miles on it in case I had a tank of poor gasoline.
Are the spark plugs/coils potentially the culprit despite being a few years old with less than 20k miles? Car is garaged but in heat (Atlanta/Tampa) always and not driven every day.
Indy cleared the codes and said to monitor it. The codes/CEL have yet to appear. Car still not idling properly, sometimes slow to start, and at times the pickup does not seem 100%. Blipping the gas pedal in neutral results in less than typical exhaust note.
Thank you
You say that the oil filler tube was replaced. To do that job the alternator has to be removed in order to get to one of the bottom bolts holding the filler. Above and behind the alternator are evap lines which over time become brittle. My guess is whoever removed the alternator inadvertently broke or pulled and disengaged one or more of the evap lines causing the CEL to appear. This would also cause the engine to run lean as the system is now sucking in extra air which the computer is unaware of. The computer is only aware of air entering via the Mass Air flow sensor but nothing beyond that point. Thats my guess. I suggest you go in and removed the alternator and check those evap lines. At least that's what happened to mine when I let a 'so called mechanic' work on my car. I had to repair the lines myself.
if it was idling rough and all the mechanic did was clear codes you need to find a shop that knows how to use a scan tool.......sometimes just looking at injector on time tells the wrench you have a vacuum leak .there is a long diagnostic tree to follow in some cases for codes .....i guess this shop was busy or you will have to make an appointment and drop it off [costly] .i do not recommend you taking the car apart poking n hoping
Yes, the shop was busy - mentioned there could be a vacuum leak, could be bad gas, few other things...suggested I drive it enough to get rid of the tank of gas and see if problem persists. Said to bring it back for full diagnosis if continues. I am confident in their ability, it's a Porsche only shop...
My observations with a vacuum leak are higher idle, less stable idle & a bit of sound coming from the line in question.
Coil packs seem like a clear possibility. I'd go easy on driving the car until you get the fuel mixture right & idle corrected. It sounds like there are two issues in my view, but I'm biased by my specific yet narrow personal experience.
Try troubleshooting these:
- cause of idle disruption (vacuum line possible, idle control valve (?))
- cause of misfires (crank position sensor, coil packs main culprits)
Comprehensive testing of fuel trims, injector pulse widths, fuel pressure, MAF values, will determine if there is an air/fuel ratio problem, and if it's lean/rich. The results/values will determine what tests/checks are done next. Vacuum leaks are the most common culprits.
This is a source reference. Confirm exact model applicability in the original material.
