With situations like this, any inexpensive "rule out" that also helps the car is a decent starting place. For example, a bottle of Techron injector cleaner will remove moisture and clean the injectors. (to a degree anyway) Porsche recommended it in a service bulletin for my 944 that the PO had kept, since then I have always put one in each spring. Mileage of the car would be helpful, if it's high and none of the spark components have been changed a symptom like you describe can manifest, (plugs, coils) a dirty or faulty MAF can affect that too. When was the last time she had an air filter? Those are some basic places to begin checking.
idle and roughness issues
I am having some minor issues with my 2015 981 s. The rpm needle is a little jumpy at idle, sometimes I have some odd vibrations - mostly felt when the temp outside and temp on the car is on the lower end. Once the car fully warms up it idles much better. Car feels fine and drives fine otherwise. Hooked up a PIWIS and I am not finding any faults or issues, no misfires. the only thing I am seeing is some higher value on 'engine roughness cylinder 1-6" values, though I am not sure what these value are really supposed to be. Any idea if carbon build up on the intake side could cause those symptoms, or maybe someone knows what else to check. Thanks for any input.
A couple bottles of Techron injector cleaner has been used with little help. Car is at 36,000 miles right now, the spark plugs and coils have been replaced about 2 years ago. The air filter about 8k miles ago.
A couple bottles of Techron injector cleaner has been used with little help. Car is at 36,000 miles right now, the spark plugs and coils have been replaced about 2 years ago. The air filter about 8k miles ago.
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Thanks, I updated my post with some more information. I didn't think the 981 has a MAF sensor.With situations like this, any inexpensive "rule out" that also helps the car is a decent starting place. For example, a bottle of Techron injector cleaner will remove moisture and clean the injectors. (to a degree anyway) Porsche recommended it in a service bulletin for my 944 that the PO had kept, since then I have always put one in each spring. Mileage of the car would be helpful, if it's high and none of the spark components have been changed a symptom like you describe can manifest, (plugs, coils) a dirty or faulty MAF can affect that too. When was the last time she had an air filter? Those are some basic places to begin checking.
If it’s idle, I’m betting MAF or coil packs… or possibly injectors… get a scanner on it, then start ruling out components
If it’s idle, I’m betting MAF or coil packs… or possibly injectors… get a scanner on it, then start ruling out components
I thought the 981 doesn't even have MAF?
" Hooked up a PIWIS (aka dealer scanner) and I am not finding any faults or issues, no misfires. the only thing I am seeing is some higher value on 'engine roughness cylinder 1-6" values, though I am not sure what these value are really supposed to be. "
Sorry I couldn't assist more. As for the MAF I don't know that engine series, if it doesn't have a MAF it's certainly a system I'd like to read about to be current. As for all else it sounds like you are up on maintenance.
It doesn't. There is an air pressure sensor in the intake manifold.
Oh it’s a 981…. Oopsie… ya no MAF.. those have a MAP- manifold absolute pressure sensors…
FWIW my 987 did the same, coil packs cured it along with cleaning of O2 sensor
Not necessarily the issue, but I just had a similar issue on my base motor (2010 Boxster 987.2). The issue popped up after an oil change. Longer story short, the shop didn't install the oil filler cap properly, which causes a vacuum leak and caused a rough idle on my car (as well as threw codes including misfires, lean on bank 1 and 2, etc).
It's a dumb thing, but something to watch for... I wonder if the oring there might fail over time, or fall out... as this would probably cause an issue as well.
It's a dumb thing, but something to watch for... I wonder if the oring there might fail over time, or fall out... as this would probably cause an issue as well.
Very interesting, I recall asking here about using cleaners like Techron when I first got the car and was advised against it.a bottle of Techron injector cleaner will remove moisture and clean the injectors. (to a degree anyway)
Techron is good stuff... and is further recommended because it contains PEA, which is the recommended chemical for this task. I've been using it for years, though I will admit I haven't noticed a drastic change in any car that I've used it on. I don't use it all the time, but I have used it when recommended.. at the very least, it doesn't damage anything.
I just did Techron on both our cars... again, no significant difference to report. I also did Seafoam on the Boxster, and again I saw no big difference. Maybe my motors are just relatively clean because I usually use TopTier fuel? Still need to try Seafoam on the wife's Jetta.
I tried these two based on the testing shown at Project Farm:
I just did Techron on both our cars... again, no significant difference to report. I also did Seafoam on the Boxster, and again I saw no big difference. Maybe my motors are just relatively clean because I usually use TopTier fuel? Still need to try Seafoam on the wife's Jetta.
I tried these two based on the testing shown at Project Farm:
I’m fine with using any PEA additive/cleaner periodically. I found some Gumout I’m trying now.Very interesting, I recall asking here about using cleaners like Techron when I first got the car and was advised against it.
Shawn in VA (USA)
You will always get some uninformed answers on forums. I have even made mistakes myself and corrected them. Techron is great, proven stuff and the first thing anyone should try with these sorts of issues because it can only help. Techron has been in all Chevron fuels for decades. We ran it in GTP fuel injectors. BMWs fuel injector cleaner last time I purchsed was just Techron. Porsche sells their own Techron-like German product that is approved for Porsche. It is the exact same stuff for VW, Audi. If you have any concern whatsoever, then just by the Porsche brand equivalent. I did..while I know firsthand Techron is great, I still went ahead and bought the Porsche fuel system cleaner. If you have never run it in a few years, I would do two consecutive tanks's worth too.Very interesting, I recall asking here about using cleaners like Techron when I first got the car and was advised against it.
I discovered recently that LiquiMoly has a PEA product called "DI Jectron" which might be useful for 981 owners.
LIQUI MOLY DI Jectron 300ml
The blurb states "DI Jectron cleans direct injecton fuel systems and reduces the risk of engine damage caused by Low Speed Pre Ignition (LSPI)."
I've put some though my car as a preventative measure but as I always use V-Power and haven't experienced any idling or rough running issues I can't say whether it was of any benefit.
LIQUI MOLY DI Jectron 300ml
The blurb states "DI Jectron cleans direct injecton fuel systems and reduces the risk of engine damage caused by Low Speed Pre Ignition (LSPI)."
I've put some though my car as a preventative measure but as I always use V-Power and haven't experienced any idling or rough running issues I can't say whether it was of any benefit.
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