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)

What are normal MAF values?

Recommended Posts


I'm trying to get more information about a P1126 DTC problem (2001 Boxster 2.7L manual) using an OBD-II scan tool that I have. I can see that the long term trim is maxed out on both banks of cylinders at 30%, and from other posts here I can see the potential problems could include a bad MAF sensor, intake leak, exhaust leak, and bad fuel pressure or clogged injectors.

From the scan tool I can see that the MAF sensor is reporting about 3.0 grams/sec airflow at idle (700 rpm) and taking it up to about 7000rpm the MAF reading went up to 55 grams/sec (@60% engine load). Generally the MAF reading in gr/sec was roughly 1:1 (+-10%) proportional with the calculated engine load (e.g. 40 gr/sec at 40% engine load).

To anyone familiar with MAF values does this seem normal or way off? I've seen typical figures for a couple of other cars and they seem to go well over 100 gr/sec airflow, so I'm wondering if these readings directly indicate a bad/under-reporting MAF sensor and whether any particular underlying cause is likely ruled in or out.

Many Thanks,


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.