29 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRuns like *****, then fine
Leading reported evidence
Replace plugs at 60k miles it wasn't difficult at all
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
I know when I changed the plugs at 60k miles it wasn't difficult at all.
Leading evidence: 'Replace plugs at 60k miles it wasn't difficult at all' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'coil pack and/or spark plug' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check evaporative emission system' (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.
Use durametric, i posted the fault codes, i got nothing
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
I used a durametric, I posted the fault codes, I got nothing from here or Pellican, so I took it to the shop...
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 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
WRT failed coil packs, and misfires in general, a common diagnostic technique is to swap the suspect coil pack and/or spark plug with those from a cylinder on the opposite bank, and observe whether or not the problem "follows" the transplanted part.
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
there is a procedure to check the evaporative emission system that should be run through.
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
Right before I sold mine, eleven days out warranty, high pressure fuel pump let go, after a $1500 40K mile service, luckily Porsche good-willed repair, close to $4K between parts and labor, brought it home within a day I spotted small hydraulic steering fluid stains on floor, sold the car three days later.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
coil pack and/or spark plug
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
WRT failed coil packs, and misfires in general, a common diagnostic technique is to swap the suspect coil pack and/or spark plug with those from a cylinder on the opposite bank, and observe whether or not the problem "follows" the transplanted part.
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.
29 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Planet-9: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have an 09 Cayman S with about 68k miles. I just put on a new Borla exhaust. Decided to take it out for a drive (full throttle, 100+ mph), and I got a message saying something like "Take car to service" and then it started running really bad. When you would accelerate the RPM needle would shake, the car would shake...figured I blew a head gasket.
Anyway, went to the store and got an ODB2 scanner. Didn't pull any trouble codes. Started the car up, and it drove fine. Took it up to 100+ again. Still fine.
I'll add, I typically run 89 octane in the car when I'm not tracking it. I know, not the best, but saves a few $ and it is my understanding the ECU adapts to the lower octane.
Anyone able to explain what happened?
Re: Runs like ****, then fine
You need to get the code. Maybe you have an exhaust leak triggering a bad O2 reading and it's putting the car into limp mode. After a hard drive like that I got a CEL but mine was for the MAF sensor. It didn't really seem to run poorly or shake though.
Re: Runs like ****, then fine
Perhaps it just needed to warmup. I Wouldn't use cheap gas even for regular street use. Your car was designed for premium fuel. Maybe just a misfire from clogged fuel injector. Don't know until you get the code. It maybe worth a trip to the shop.
Re: Runs like ****, then fine
The off-the-shelf OBD readers will not get the Porsche-specific codes. For that you'll need a Durametric or the factory reader. There may be P9 members in your area with a Durametric Pro tool who would be willing to take a reading.
Re: Runs like ****, then fine
you can try disconnecting the battery for 10-15 minutes to reset the ecu. let me see if i can find you the link.
did a search but couldnt find anything but i do recall reading somewhere that sometimes your fuel mapping might be affected after installing free-er flowing performance items.
Re: Runs like ****, then fine
Thanks all. I did order a Durametric as the issue seems to come and go. I may try pulling the battery and going through that stuff as well.
Re: Runs like ****, then fine
Since the problem started after changing the exhaust, that would be the best place to start any search.
My non S 09 seems a little sensitive to fuel used and impacts the car in a big way.
congrats on the new exhaust though! they really do spice up the car!
Re: Runs like ****, then fine
I had a similar issue two years ago, and had it again this year. I would start the car, drive for a bit and then suddenly the car would shake a bit and the revs were extremely hesitant.
Check engine light
came on. Felt like engine was about to blow up. I've shut the car off during both trips and restarted the car in minutes -- issue remained there. I drove the car at crawling pace home, and the car started up fine the next morning.
Both times happened without any changes or mods beforehand. I brought the car back to the dealer to read all the error codes, and nothing showed up as well. The explanation I got my for my case was that some of the cylinders weren't fired up properly at start up. Strange ...
Re: Runs like ****, then fine
Yes. But these threads come and go and usually people agree to disagree or a mod locks them up.
Seriously?
Looking at
http://www.californiagasprices.com/
The median Regular price seems to be $2.73 per gallon. The median Premium price is $2.95 per gallon. That's a difference of 22 cents per gallon. The 2009 CS has a gas tank of 16.9 gallons.
Let's assume 17 gallons. A tank-full of gas means you save <$4 a fill-up assuming you fill from an empty tank. Assuming you fill up once a week (from a quarter-full tank), you're saving <$12 a month.
That's the price of a movie ticket. Without popcorn.
Or barely 3 Starbucks grande caramel macchiatos. If you aren't tipping and don't consider sales tax.
I'm not sure what your issue is but the high compression in these engines means you get more torque from the recommended gas.
Re: Runs like ****, then fine
As others suggested I'd recommend running the proper octane fuel for a while anyway to see if it clears the issue. I've always figured on a high compression engine that the DME doesn't so much adapt to it as compensate for the lower octane enough to prevent destruction. Continuous running probably skews all the normal adaptations. Add in a free flow exhaust and the engine doesn't know where it's at. Probably why no codes. Everything is in range just skewed off of anything normal.
If nothing else and premium gas doesn't solve it you at least have a proper baseline to work from.
Re: Runs like ****, then fine
Yes, spark plugs were changed at 60k. I've been running proper fuel and disconnected the battery a week ago. Still having issues. Hooked up the Durametric and getting C0104 "evaporative emission system incorrect purge flow. Value below lower limit." Google search doesn't seem provide anything useful.
Re: Runs like ****, then fine
Knowing is half the battle.
With that code, you may want to ask your local dealer or specialist about it. Failing that, I would post an inquiry over at
Pelican Parts - Porsche Parts & BMW Parts & Mercedes Parts - Automotive Parts and Accessories - Porsche & BMW & Mercedes
for some free expert advice. They may be able to tell you the exact part number that needs replacing or updating.
Based on that description, I would be guessing air/oil separator but your symptoms don't really match.
Best of luck to you and please keep us posted on your progress.
Re: Runs like ****, then fine
First of all, sorry to hear about your problem. Nothing more frustrating than intermittent issues. Secondly I think there might be a danger to make connections where there are none, a logical fallacy. Just because you happened to change your exhaust doesn't necessarily mean it is related to your issue. A guess from my side judging solely by the fault code/message would be that you have some sort of vacuum leak. It could be as simple as you haven't tightened the gas cap properly; Porsches are picky with that and will iirc throw an error if that is the case. Or it could be a faulty solenoid, a broken vacuum line etc. That is where I would start - to search for vacuum leaks. Then if nothing found move on to electrical issue and test the solenoid(s). Good luck!
Re: Runs like ****, then fine
there is a procedure to check the evaporative emission system that should be run through. I believe it is in AllData diy, I saw it for my 987.1, it may be different for 987.2
You might try connecting a Durametric to see what the fuel pressures are. 2009 had high pressure fuel pump issues. do you have the car's history?
good luck
Re: Runs like ****, then fine
there is a procedure to check the evaporative emission system that should be run through. I believe it is in AllData diy, I saw it for my 987.1, it may be different for 987.2
You might try connecting a Durametric to see what the fuel pressures are. 2009 had high pressure fuel pump issues. do you have the car's history?
good luck
Re: Runs like ****, then fine
Could be carbon buildup due to DFI. Have you ever had the intake valves cleaned? Other symptoms could include poor fuel economy and difficulty starting.
Re: Runs like ****, then fine
Finally got the car back from the shop. 3 weeks and $1500 later... The problem: bad coil pack on one of the cylinders. Seriously considering selling the car. I'm a little annoyed that you can't get the service manual for these cars. I just got a 35 year old Datsun running that hasn't run in 15 years for $200 in parts and a few hours with the manual. Now that this Porsche has almost 70k miles, it's going to need more work and I'm not about paying thousands of dollars for every $50 part that needs replaced. Sorry for the rant, but this really bugs me. How do ya'll troubleshoot issues on these cars?
Re: Runs like ****, then fine
Some get codes from indie then do work themselves or friend or club member has diagnostic software. The older they get the more things need to be kept up. Right before I sold mine, eleven days out warranty, high pressure fuel pump let go, after a $1500 40K mile service, luckily Porsche good-willed repair, close to $4K between parts and labor, brought it home within a day I spotted small hydraulic steering fluid stains on floor, sold the car three days later. Now, I'm waiting to go order a 991.2, this time on the advise of my SA (also a friend) I'm leasing, not keeping. The nature of the beast.
Thanks Mike, I guess my issue is that there wasn't really a way to troubleshoot it. A rough running car could be a lot of things (MAF sensor, failing injector, or many of the other suggestions posted in this thread).
Re: Runs like ****, then fine
stratman, I agree, but I think most of the labor was troubleshooting. I know when I changed the plugs at 60k miles it wasn't difficult at all. I did consider the leasing option, but these cars drop in value too fast. Leasing a new CS would be close to $1k/mo with limited miles. I paid $32k for my 09 CS with 50k miles. I figure I can probably get into a 944T for around $10k. If it is well maintained, I don't see it being a maintenance nightmare - and I've already saved myself $20k.
Plus it probably isn't going to depreciate any more.
So, now you've paid your tuition. Invest in Durametric professional (or befriend someone who has it,) read out the fault codes, and post them or research them online to dignose your issues. It'll be much cheaper in the long run, if you don't mind getting your hands dirty, and you have the proper tools and mechanical aptitude.
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Sorry I missed that. If you're a pca member, you could join the PCA Cayman Register. They have "inside" access to Porsche service and training materials, and a search of the fault codes there might yield more insight than is available to the general public. I don't mean to revive an old debate about why this information isn't publicly available, I'm just trying to help you cast a wider search net next time.
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WRT failed coil packs, and misfires in general, a common diagnostic technique is to swap the suspect coil pack and/or spark plug with those from a cylinder on the opposite bank, and observe whether or not the problem "follows" the transplanted part.
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