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Byron in Atlanta

MAF, PSM, ABS issues!

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I know this issue gets beat to death but but I cannot seem to resolve my issue with over a year of dealing with it!!! Last year I converted my car to rear wheel drive. After that I would get the dreaded PSM/ABS failure whenever I would get a little spirited in my driving. Track days were the worst obviously. So I would disconnect the PSM pump in the front trunk. This would at least allow the ABS to continue to work. At first I thought this issue was a result of removing the front running gear and thought the ECU needed reflashing since the error said something like "Signal improbable".  

 

After a few weeks, it started throwing the P0102 code, so last March I replaced the MAF. I thought this had fixed the PSM/ABS Failure issue, but upon the next track day, it reappeared. 

 

So now I got the car back after 6 months of front end conversion and it will barely run with the MAF connected. I have been disconnecting the MAF to drive the car, and it runs great, but the PSM/ABS Failure and P0102 occur instantly. 

 

So I got a Durametric tool and connected it and have attached a sample log. The MAF seems to be working based on what I have read online, but it runs terribly. It spits, sputters, and searches for an idle speed. When revved, it is not smooth, and won't hold a steady RPM. Disconnect the MAF and it runs fine, but the PSM and ABS shut down and the CEL comes on. 

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Did you purchase a genuine Porsche (or Bosch OE) MAF, or an eBay knockoff?

 

There are lots of reports that the cheap eBay knockoffs don't work well at all and you end up with the symptoms you are reporting.

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