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Registered
Join Date: Sep 2001
Location: Kerrville, Texas
Posts: 1,021
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I have about 85,000 miles on my mass flow from autothority. There was some detonation during Houston's hot summers at first so I sent the chip back and they reprogrammed it. Seemed to cure the knock except when given near to full throttle after the engine heated up in traffic. If I let the engine cool down a little it seems ok.
The plunging tach problem sounds like a problem I had a couple of years ago. After months of replacing all sorts of things we traced it to a bad potentiameter in the wiring harness from the sensor. I replaced it for $90 and the problem went away.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not.
2012 BMW 528i (wife's)
2007 Toyota FJ (rain and off road days)
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