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)

Replaced Check Valves and now having problems


Recommended Posts

I had a CE light; and replaced the check valves. Now the CE light is gone; but when the car is started up while cold the car for the first 2-3 minutes is hesitating to the point where it feels like the engine is going to stall out. The CE light is not coming on. Everything replaced has been rechecked and nothing found amiss; any help??

Link to comment
Share on other sites

sorry.

97 boxster w/manual trans. i had the codes p0411; i can't remember the other one (both secondary air induction system). I replaced trhe check valves, cleaned the throttle body and maf sensor. before this the car ran ok; but had a cel light on. now, no cel but the car will feel like it will stall in the first couple minutes of driving (bad enough that i have to pull over and hope the car does not stall. also the car has no power; thus i can't rev out of the rough running).

i've gone through all of the posts; maybe a bad maf sensor??; maybe i need to unplug the battery to reset the computer,something i did or didn't do when replaceing check valves, i also replaced the air filter.

Link to comment
Share on other sites

  • Admin

MAF has nothing to do with your idle - just unplug it and I doubt you will see any change.

Perhaps you had:

P0410 Secondary Air Injection System - Signal Implausible (Cylinders 1 - 3)

P1411 Secondary Air Injection Sy.stem - Signal Implausible (Cylinders 4 - 6)

Possible faults:

Secondary air injection pump is not triggered.

Secondary air injection pump does not work.

Air supply lines restricted.

Electric change-over valve does not work.

Air change-over valve does not work.

Vacuum system leaks.

- Wiring harness or fuse

- Relay

- DME control module

- Air supply lines

- Secondary air injection pump

Does your air pump run at startup?

Link to comment
Share on other sites

yes, those were the codes that were present. my issue is that the car was running fine when those codes were present. i then changed the changeover valves and am now having this issue. at least the CEL is not coming on!!

everything is normal except for the intermittent hesitation. took the vacuum hoses, throttle body, and intake manifold again and reassembled. i thought i had it fixed, but tonight around 2-4000 rpm's the problem came back. not as bad as it was, but still there.

also, the temp guage is normal, but the engine seems to be throwing off alot of heat and associated odor around the right rear tire.

also, this has always happened while the car was in motion; not at idle.

Edited by Loren
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.