6000 rpm miss 99 996 x51
#1
Pro
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Join Date: Mar 2006
Location: Oakville Ontario Canada
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Have miss @ 6000 rpms 4th /5th gears somtimes 3rd hard acceleration. Have checked fuel pressure/quanity. Everthing else seems fine, no codes. Changed mass airflow meter seems to good away for a 4/6 hrs running then comes back. Any ideas. non stock air box.
#2
Nordschleife Master
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What tests did you do to determine the mass airflow sensor? Have you plugged in the Porsche System Tester and run through the test? Have you considered a failing coil on one of the cylinders?
#4
Three Wheelin'
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ETHANOL!!! My 03 996 X51 trips a check engine light for detonation with Exxon, Mobil or Sunoco 93 octane now that we have the 10% ethanol. It ran fine on Ultra 94 which is no longer available. Now I run it on Sunoco GT100.
#5
Three Wheelin'
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Ernie. I experienced a severe surge or misfire with my non egas 99 996. It was due to my first generation EVO CAI. I switched to the stock air box and it went away. I upgraded to the second generation EVO CAI and I have no more problems.