Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

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)

P0430 and hollow knock


Recommended Posts

I have an 02C4s. A few weeks ago I started hearing a hollow infrequent knock at idle that has become more regular and noticeable over time. At first it sounded like something was loose and was just intermittently rattling as the engine was at idle (exhaust or something in that general area).

2 weeks ago the car threw a CEL for a misfire on cylinder 1, which was attributed to a cracked ignition coil that got wet during a Florida monsoon. I replaced all of the plugs and coils (as I just crossed 60k miles) and the car has run great for 2 weeks.

Today on the ride home I threw another CEL with code P0430. The most likely suspects are a bad Cat or O2 sensor, but I am unclear if either of these would produce the knock I am hearing underneath the car. Would the Cat or O2 sensor contribute to a hollow knocking sound at idle? Is the P0430 typically attributed to a bad Catalytic Converter/O2 sensor or is there anything else I can take a look at given the tapping sound I am hearing from the engine?

Edited by tampa996
Link to comment
Share on other sites

Most likely your bank 2 cat (passenger side) is physically broken inside hence the knocking. You can put a screwdriver between it and your ear to check for the knocking noise. P0430 alone is likely the bank 2 cat since bad o2 sensors have their own codes.

If you have a scanner that can read O2 sensor values in real time, check out post #22 here

http://www.renntech.org/forums/topic/43522-p2096-porsche-fault-code-16-oxygen-sensor-ageing-delay-bank-1/page-2

Edited by Ahsai
Link to comment
Share on other sites

As Ahsai said, you will want to do the due diligence and read the O2 sensor values (very easy to do with a Durametric, especially if you read that post) but I also think your cat is bad given the code and what you have said. I went though the same thing on the exact same car.

Also, this isn't a fact but it's my strong opinion after doing a lot of reading back when that post was made: The 2002-2004 C4S have cats that seem to go more often after 60-80K miles (the C4S in fact has cats with a different part # than its brother and cousin, the C2 and Turbo). This is disproportionately more common on the C4S cats for some reason. I don't really have the exact answer to why that is but one thing I noticed after switching from the C4S to a Turbo was the Mezger seems to run with a lot less vibration in the exhaust (making them last longer). Just my personal opinion as the result of my own experience with the same issue.

Edited by Silver_TT
Link to comment
Share on other sites

  • 2 months later...

Digging up an old thread, but I finally got around to ordering new headers and cats from fabspeed. Will be bolting them on this weekend, hopefully it will be a painless endeavor!

I have read 19 ft. lb. torque on the header and 22 ft lb. on the cat., can anyone confirm this?

How about a torque measurement for the O2 sensors?

Edited by tampa996
Link to comment
Share on other sites

  • Admin

Digging up an old thread, but I finally got around to ordering new headers and cats from fabspeed. Will be bolting them on this weekend, hopefully it will be a painless endeavor!

I have read 19 ft. lb. torque on the header and 22 ft lb. on the cat., can anyone confirm this?

How about a torque measurement for the O2 sensors?

Header 19 flb.is correct.

Cats and O2 sensors (using the proper tool) are 34 ftlb.

Link to comment
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.

Guest
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.