986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Sluggish Power 3k-5k rpm range?

thstone · 02-21-2013, 11:49 AM

As you drive, the ECU will slightly change the ignition timing to improve performance and minimize air pollutants. Replacing the battery will reset the ECU to the stock or default parameters. This can result in the engine running slightly "different". Drive it for a few days encompassing about 100 miles in varying conditions and the ECU will re-learn on its own. If this was the cause, then the mid-range power should come back.

02-21-2013, 11:49 AM	#6
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	As you drive, the ECU will slightly change the ignition timing to improve performance and minimize air pollutants. Replacing the battery will reset the ECU to the stock or default parameters. This can result in the engine running slightly "different". Drive it for a few days encompassing about 100 miles in varying conditions and the ECU will re-learn on its own. If this was the cause, then the mid-range power should come back. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor