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Everything posted by auto-techltd
I am a shop owner technician with 30 years experience on German Cars primarily, I work on a variety of year cayennes and a few boxsters now, have worked on all over the years, but tomorrow is another day and...?
I belong to many professional groups and have a wealth of info to those that want to listen! :)
I meant and spoke with the owner Bernie of Automotive Test Solutions at a BIMRS convention and this is a cool tool, the E-scan plugs into the OBD2 port and a laptop to interpret information in the most amazing ways, you can do fuel trim graphs that show the real-time data in color graphics representing lean or rich, you can do catalytic converter efficiency tests and more, costs the same as a durametric pro but a great tool for the do-it your selfer that wants to learn how the engine is really running and performing. This tool has helped me diagnose most porsche MAF problems.
I have the durametric professional version and like all other professional level tools that I have used they are all not point and click and each has a learning curve, that is sometimes beyond the average car owner that purchases this stuff trying to save a buck on maintenance, You have to know the adaption values, the basic setting info and all that stuff to really make this tool work to your advantage, a full service manual with all the obd2 info is helpful for each model you are trying to fix, cause Alldata and all the others just dont have the finite info we need to fix these cars properly. It is always experience and being able to interpret the fuel trim info properly.
Fuel trim's goal is to maintain the stoichimetric (14:1:1 ) Air/fuel ratio, it is important to also consider the computer factors in other sensors info to move that optimum ratio about a little or a lot, 30% is a lot from what it is striving for at zero, I have replaced many faulty MAF sensors on this model porsche over the years and it has corrected the problem, but the motor should be smoke tested properly cause there are a variety of places for air leaks and that is what causes a lean problem usually...air leaks after the metered air, that are not accountable for the computer to compensate for, so this is really important to have checked by aq competant person, let me know where you live and I will hook you up with a competant person, I belong to many professional european car organizations and have friends in this biz all over the world.
I see you're values are in the 30 percent range to the positive adding fuel, the computer can only compensate for so much and the sensors too, you need a MAF your engine is running very lean, also look at your air filter, if it is a K&N get rid of it and go stock.
I also have a different take on this subject and can almost gaurantee, after having smoke tested for vacuum leaks, if that passes and still there, it would be the MAF, Maf's rarely throw codes, it is usually fuel trim problems, by the way what are you're fuel trim values, those are by far the most tell tales of what is going on in the breathing process of your engine, there should be a Short Term Fuel Trim which is what is happening now and a long term fuel trim which happens over time.