Sajan

that’s the trim piece.

this is the actual oil cap.
SKU: 98110703508

rezilient

Hi ​​​@Sajan @subshooter sorry to bump a pretty old thread but I had a question for anyone that was having similar hesitation/stumbling issues and resolved it.

I’ve been reading about carbon build-up on the intake valves on our DFI engines and was wondering if you looked into doing a walnut blast or similar? For example: https://www.planet-9.com/threads/bef...981-cs.255957/

I’ll probably go ahead and order the oil cap anyway but am pretty confident I’m going to end up needing to blast the intake ports.

Thanks.

Sajan

Cars that have exhibited this had relatively low miles on them so I doubt doing something like that would help.

My conclusion on this is it's related to crankcase pressure.

quantim0

My ‘15 cayman S has/had this issue of a hard stutter or power cut between 2200-2600 under partial throttle.

I loaded the Cobb OTS ecu/tcu tune and that definitely helped minimize the issue but it’s not totally gone.

Checked my oil cap and I do not have the o-ring. Ordered the part from Subcoast and will report back.

When checking the oil cap o-ring I noticed a lot of oil had burped back up into the cap area. I had just completed and oil change so I’d imagine there was some excess oil not drained into the sump, but I don’t think pressure should be escaping through that area forcing oil back up the tube.

t-design

If you also has hesitation on start - like battery is low, and misfire errors in the report - HPFP would be my first suspect

Renius

My well maintained 2013 Boxster S with 115,000km was also experiencing at bit of "stumbling" around 2500rpm.
It had the factory oil cap with the missing upper o-ring and had oil residue all under the cap.
I ordered a cap from the Porsche dealer for $30 CDN all-in and have been running it for a week now (400km)

I believe the hesitation is now gone or at least materially reduced! Go figure
Thanks for hard debugging work the recommendation to try this easy / cheap fix.

Chrismalberts

I never felt my 981 base accelerated smoothly from lowish revs and the Softronic tune 100% eliminated that - and of course made it feel stronger too. I think it's a trait of the car, that the careful attention of a tuner such as Softronic can eliminate.

rezilient

I replaced mine unfortunately didn't see any difference (but at least I'm using the improved oil cap at this point).

rezilient

I need to try this, thanks for the input!