Jump to content

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)

Oily Grime Behind Throttle Body


Recommended Posts

Does anyone know what is causing the oily grime on the hose clamps just behind the throttle body on my 99 996 C2? It's on both sides nearest the boot but not any farther back. There is much more on the drivers side. My neighbor does have a spec of this on the drive side clamp of his 99 996 C2, but no where near as much as mine.

This photo was shot looking over the oil filler hose and dip stick.

post-5901-0-07653800-1313874536_thumb.jp

Edited by cab713
Link to comment
Share on other sites

I've searched for AOS issues. The replacement DIY seems to show oil in the upper intakes that may be similar, but I have no white smoke at start or rough idle.

I'll start with the intake plenums as that is the only place I can see grime right now. The oil filler tube seems to be totally clean from what I can see. I'll confirm while getting after the intake plenums.

Thanks!

Link to comment
Share on other sites

I wasn't speaking about the AOS specifically going bad. That is in a totally different part of the engine (on the top of the drivers side towards front of car).

What I was talking about is...

There is a tube that goes from the AOS to the y-plenum behind the throttle body.

The connector for that tube is right on the y-plenum behind the throttle body just above where you are mentioning you see grime.

That tube (and it's connector at the y-plenum behind the throttle body) has a rubber o-ring that can go bad over time and leak or the tube itself can separate from the connector to the T/B or it might not even be properly connected.

It is very hard to detect small leaks in the oil filler tube without a smoke machine (crack could be in the bottom of a pleat). Chances are if it hasn't been replaced in 12 years it might have a leak (it is plastic). Mine literally just broke off after 12 years.

As for the intake plenum, it could be one of the large rubber boots are damaged, or a clamp not tightened down fully.

Some of these items would also probably be accompanied by a rougher than normal idle.

Edited by logray
Link to comment
Share on other sites

The tube I am most suspecting connects to the opening on the y-plenum circled in red. The other end of that tube goes to the air oil separator.

It could also be a leak in the tube itself, if not the connector or the o-ring.

tubeu.jpg

Edited by logray
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • 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.