Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

In process of some various engine maintenance on MY 99 996.

Examined the secondary air system yesterday. The lower SAI valve is completely filled with carbon and is not functioning. The upper check valve is still working and it looks like the lower SAI valve has taken most of the carbon build up (hence reason why no CELs). I have a new valve on order and cleaned out all of the plumbing on the top. But now I'm concerned about the passageways through the engine. They are both caked with several millimeters worth of build up.

Has anyone ever performed this cleaning on a 996 similar to 993 procedure?


Or perhaps have a SAI passageway diagram?

Although I have the cam covers removed already, I'm trying to avoid removing the heads from the block to do this cleaning, since that would mean about $300 for bolts and gaskets.

I know there is an updated combo valve you are supposed to retrofit, but at considerable expense to change out a lot more parts, I opted to stay with what I've got.


Edited by logray
Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

I'm sure they're all gummed up. The ports in the heads are fairly simple, and could be cleaned without too much fuss. You don't need to pull the heads (which is a pretty good size job on these motors), but I imagine it'd be incredibly difficult to do with the motor in the car. With it out of the car, it'd be VERY easy to clean all of this.

Link to post
Share on other sites

So i have engine out and cam covers removed. where do the other side of those ports come out, near the exhaust valves?

They come out in the exhaust ports, so if you pull the headers off, you'll see the outlets. If you just run some solvent through those passages, it'll clean them up.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.