Hi guys, just making my first post as a new joiner to the community! I purchased a 997.1 C2S a couple of months ago and have been enjoying it a whole load since then! I previously owned a 997.1 non-S and cannot believe how much the jump to an S car makes - definitely worth the upgrade IMO!

Anyway, couple of photos below and also a video for a question (presuming I manage to actually attach the video correctly)… I’ve noticed that at idle the revs seem to jump around a little, it’s really quite a minor variation and seems to have no effect on how car performs, just wondered if anyone had a similar experience?

 

Looks good with those dark wheels. Were they painted?

 

Can't find a link to the video so not sure how much of an RPM "jump" you're talking about. But the "minor variation" you refer to is what I've seen in three 997's now. None of the three had a dead steady idle RPM so I'm guessing this is within acceptable tolerances. I say that since all three cars have been serviced by a Porsche dealership and the minor idle RPM fluctuations were never mentioned.

 

Think this should work - as I say above, the 'jumping around' is really really minor, just curious as I didn't notice it on my non-S previously, but sounds like I just wasn't paying close attention previously!

 

Thanks! They were indeed, they were painted by the previous seller I believe. Seller (Porsche specialist) then refurbished them thankfully!

 

Thanks for reply, Sandwedge. That's helpful to hear, sounds like you've have a similar experience - I've just managed to upload a video in a reply above in case interested!

 

Thanks, Okbarnett! They were painted by previous owner and then the dealer (Porsche specialist) refurbished them thankfully!

 

Remove the airbox to the throttle body connection and clean the inside of the throttle body with carb and choke cleaner or similar by spraying it on a rag that's on a wooden paint stick so you can get in there and apply a little scrubbing force without scratching anything. Manually open the throttle plate, clean both sides of it and especially the inner circumference of the throttle body where the plate closes against it. Keep repeating until the rag comes out clean.

 

I’ve got nothing, other than your garage is epic. I’m in planning phases from a big garage that will handle a 45 foot motorhome and several cars.

 

I acquired a low-mileage (34K miles) 997 C2 last December which exhibited this same behavior. It had a 50-75 RPM fluctuation around the 750RPM target idle. It bugged me. Engine RPM was steady on throttle, but the idle fluctuations were disappointing.

Prior to changing the engine oil I added a bottle of Techron Fuel Injector Cleaner (*) to the fuel. I drove the car until the fuel tank was nearly empty to let the Techron work, then filled-up with fresh fuel to dilute any residual Techron in the fuel system. I promptly changed the engine oil to remove any residual Techron that may have made its way to the oil sump and not been vaporized after engine warm-up to operating temps. Wouldn't want Techron diluting oil viscosities, washing cylinder walls free of oil, etc.. Doubtful but possible, if there would be significant blow-by the rings for example. BTW this car requires no additional oil between 3,500 mile change intervals, so its blow-by should be minimal, thank goodness.

Not long thereafter the idle smoothed-out and it's now rock-solid steady at 750RPM. I suspect some clogging of the fuel injector(s) negatively impacting the low-flow performance/spray pattern(s) at idle. Perhaps a by-product of the car not being driven by the previous owner, which appears to be a similar trait to your car with ~43K miles on the clock as seen in your video. YMMV.

Air/fuel/ignition, any one or a combo could be a factor. Good luck with it.

(*) - no affiliation with Chevron on my part, but for many years a believer in their gasoline products to keep fuel systems clean.

 

What Petza914 and Slips2 said.

I've got a 9A1 motor (997.2) so my result may be different than yours, but with 141K miles my idle remains rock solid without any need for any interventions as of now.

I do believe in Techron and use only Chevron gas (or on occasion Shell just to mix up the cleaning additive packages).

Bottom line ... just my opinion, but I don't believe a wavering idle is normal on these cars.

 

O Sh*t is that the OP's garage? I assumed it was where he was picking the car up from. Either way looks like a great collection.

 

FWIW, I mentioned the same "needle bounce" to my technician (go-to shop in town, been with them for years, works on many Porsche's and performance of all kinds, from track cars to dailies, etc, etc.) right after I bought the car for a "post-purchase" inspection and his reply was, "Yeah, they all seem to do this." I use Techron also and always top-tier gas, usually Shell. Also, my Blackstone SOAs (every oil change) are spot on.

But I'll look at my throttle body plate now that I've seen Petza914's post!

** I suspect this isn't OP's personal garage. There's a yellow Turbo in the corner of one shot and god knows what's under the covers.
Not sure he would've been "blown away" from a .1 C2 to a .1C2S. But very glad he loves his car

 

Looks an awful lot like the Friends Green Porsche garage.

 

That’s what I was thinking too.